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63rd Annual Meeting and Exposition of the American-Society-of-Hematology (ASH) -- DEC 11-14, 2021 -- Atlanta, GA, [No Abstract Available], Amer Soc Hematol

Introduction: Growth retardation (GR) and pubertal disturbances are the earliest consequences of iron toxicity resulting from the pituitary iron deposition in children and adolescents with thalassemia major (TM). It is suggested that adequate transfusion regimens together with appropriate management of iron chelation with timely initiation and dose tailoring by close monitoring using surrogate markers of the iron load may achieve a normal pattern of complication-free survival in TM. Objectives: The purpose of this study was to evaluate the fact that the current approach to the management of the disease has provided a normal growth progression and sexual development in patients (pts) with TM. Methods: We recruited male (M) and female (F) TM pts born after 2000 and followed-up (FU) in Ege University Thalassemia Center. The pts. with an acute or chronic illness that may interfere with growth and development or stem cell transplantation recipients were excluded. The Committee of Clinical Investigation at Ege University Hospital (19.02.2020, 20-2.1T/2) approved this study. Height (H) and weight (W) assessments were performed by using the Harpenden stadiometer and puberty was evaluated by Tanner staging at 3 monthly intervals. H-standard deviation scores (h-SDS) were calculated. Target-H based on mid-parental-H for M & F pts was estimated. All pts. were evaluated annually for bone mineral density (BMD) using dual-energy X-ray absorptiometry (Hologic QDR-4500W, USA) after 8 years (y) of age. The mean SDS of the lumbar spine (L1-4) BMD between -1 and -2.5 was defined as osteopenia and Transfused pRBC units (U) and average pre-transfusion hemoglobin (Hb) per year were recorded. Serum ferritin (SF) was monitored at monthly intervals. Myocardial (T2*) and liver (R2) iron were assessed by a 1.5 Tesla magnetic resonance imaging (MRI) machine (Siemens, Symphony Vision 16034 scanner) after 8 y. Annual median SF, prescribed chelator(s), mean chelator doses were recorded by reviewing pts' records. Transfusional iron intake (TII) was estimated as the total amount of pure RBCs (each U, 250 ml with 57% Hct) transfused in a y (ml) x 1.08. Daily TII was expressed as annual TII (mg)/ mean kg b.w./days of the y. Results: We recruited 30 TM (28 β/β, 1 β/δβ, and 1 non-deletional HbH) pts (13 F and 17 M). Demographics for the population are summarized in Table1. All pts maintained annual mean pre-transfusion Hb> 9 g/dl. Twenty-two of 24 pts maintained Deferasirox (DFX) chelation during 9 ± 3.6 y (median 9, range 2-13 y) and achieved optimum SF levels at all times (Figure a). The dose tailoring of DFX found parallel to the changes in TII during FU (Figure b). Liver iron concentration (LIC) and myocardial T2* (mT2*) in 22 pts on DFX chelation were between 0.9-5.4 (2.1 ± 1.3 SD) mg Fe/g d.w. and 19.4-43.5 (28 ± 6.7 SD) ms, respectively, in all assessments. The only pt with mT2* of 19.4 ms revealed mT2* of >20 ms on FU scans. The puberty initiated at 12.8 ± 1.1 y in M (n=12) & 11.2 ± 1.3 y in F (n=12) and progressed without hormone replacement in all, regardless of the chelator. Overall, growth reduced compared to the non-thalassemic population after 8 y with clear evidence of growth catch-up by the introduction of puberty. h-SDS detected Conclusions: Puberty was the main determinant of growth and bone maturation in TM. Despite, puberty has achieved within physiological limits in M & F pts, a slight delay was observed compared to the non-thalassemic population. The relative delay in pubertal spurt may lead to overdiagnosis of growth and bone-maturation failure and unnecessary intervention in adolescent TM pts. This hypothesis as well as the appropriateness of current management guidelines remains to be elucidated. Disclosures No relevant conflicts of interest to declare.

In beta-thalassemia, the mechanism driving ineffective erythropoiesis (IE) is insufficiently understood. We analyzed mice affected by beta-thalassemia and observed, unexpectedly, a relatively small increase in apoptosis of their erythroid cells compared with healthy mice. Therefore, we sought to determine whether IE could also be characterized by limited erythroid cell differentiation. In thalassemic mice, we observed that a greater than normal percentage of erythroid cells was in S-phase, exhibiting an erythroblast-like morphology. Thalassemic cells were associated with expression of cell cycle-promoting genes such as EpoR, Jak2, Cyclin-A, Cdk2, and Ki-67 and the antiapoptotic protein Bcl-X(L). The cells also differentiated less than normal erythroid ones in vitro. To investigate whether Jak2 could be responsible for the limited cell differentiation, we administered a Jak2 inhibitor, TG101209, to healthy and thalassemic mice. Exposure to TG101209 dramatically decreased the spleen size but also affected anemia. Although our data do not exclude a role for apoptosis in IE, we propose that expansion of the erythroid pool followed by limited cell differentiation exacerbates IE in thalassemia. In addition, these results suggest that use of Jak2 inhibitors has the potential to profoundly change the management of this disorder.

Introduction: β-thalassemia is an inherited hemoglobinopathy associated with an erythroid maturation defect characterized by ineffective erythropoiesis and impaired RBC maturation. Luspatercept is a first-in-class erythroid maturation agent under development to treat patients with β-thalassemia. Luspatercept binds to select TGFβ superfamily ligands to reduce aberrant Smad2/3 signaling and enhance late-stage erythropoiesis (Suragani RN, et al. Nat Med. 2014;20:408-14). We report the results of a phase 3, randomized, double-blind, placebo-controlled study to determine the efficacy and safety of luspatercept in adult β-thalassemia patients requiring regular RBC transfusions. ClinicalTrials.gov identifier: NCT02604433. Methods: Eligible patients were aged ≥ 18 years; had β-thalassemia or hemoglobin (Hb) E/β-thalassemia (compound β-thalassemia mutation and/or multiplication of α-globin genes was allowed); and required regular transfusions of 6-20 RBC units in the 24 weeks prior to randomization with no transfusion-free period ≥ 35 days during that time. Patients were randomized 2:1 to receive either luspatercept, at a starting dose level of 1.0 mg/kg with titration up to 1.25 mg/kg, or placebo, subcutaneously every 3 weeks for ≥ 48 weeks. Patients in both treatment arms continued to receive RBC transfusions and iron chelation therapy to maintain the same baseline Hb level. The primary endpoint was a ≥ 33% reduction in transfusion burden (with a reduction of ≥ 2 RBC units) during weeks 13-24, when compared with a 12-week baseline period. Key secondary endpoints included: ≥ 33% reduction in RBC transfusion burden at weeks 37-48, ≥ 50% reduction in transfusion burden at weeks 13-24, ≥ 50% reduction in transfusion burden at weeks 37-48, and mean change in transfusion burden at weeks 13-24. Achievement of ≥ 33% reduction in RBC transfusion burden over any consecutive 12 weeks on study was also evaluated. Results: † A total of 336 patients were randomized, of whom 332 were treated. Median age was 30 years (range 18-66) and 58% of patients were female. Patients received a median of 6 RBC units in the 12 weeks prior to treatment. 58% of patients in each arm had undergone splenectomy. B0/B0 genotype (classification according to the HbVar database) was observed in 68 of 224 (30.4%) and 35 of 112 (31.3%) patients in the luspatercept and placebo arms, respectively. 48 of 224 (21.4%) patients in the luspatercept arm achieved the primary endpoint versus 5 of 112 (4.5%) patients receiving placebo (odds ratio 5.79, P < 0.0001). 44 of 224 (19.6%) patients receiving luspatercept achieved a ≥ 33% reduction in RBC transfusion burden at weeks 37-48 compared with 4 of 112 (3.6%) patients receiving placebo (P < 0.0001). Of 224 patients receiving luspatercept, 17 (7.6%) and 23 (10.3%) achieved a ≥ 50% reduction in RBC transfusion burden at weeks 13-24 and 37-48, respectively, compared with 2 (1.8%) and 1 of 112 (0.9%) patients receiving placebo (P = 0.0303 and P = 0.0017, respectively). The difference of mean change from baseline in transfusion burden from week 13 to week 24 was 1.35 units (P < 0.0001). 158 of 224 (70.5%) patients receiving luspatercept achieved a ≥ 33% RBC transfusion reduction over any consecutive 12 weeks compared with 33 of 112 (29.5%) patients receiving placebo (P < 0.0001); statistically significant differences were also noted for all other transfusion burden reduction endpoints. Adverse events (AEs) observed in the study were generally consistent with previously reported phase 2 data. Treatment-emergent AEs leading to dose delay or dose reduction were similar between treatment arms. No patient deaths were reported for those treated with luspatercept. Conclusions: Treatment with luspatercept resulted in significant reductions in RBC transfusion burden in adults with transfusion-dependent β-thalassemia. Luspatercept was generally well tolerated in this patient population. † As of May 11, 2018, cutoff date. Disclosures Cappellini: Celgene Corporation: Membership on an entity's Board of Directors or advisory committees; Sanofi/Genzyme: Membership on an entity's Board of Directors or advisory committees; Novartis: Honoraria; Vifor: Membership on an entity's Board of Directors or advisory committees. Viprakasit:F. Hoffmann-La Roche Ltd: Consultancy, Research Funding; Novartis: Consultancy, Research Funding; Agios: Consultancy, Research Funding; Protagonist Therapeutics: Consultancy, Research Funding. Taher:Protagonist Therapeutics: Consultancy; Novartis: Consultancy, Honoraria, Research Funding; Ionis Pharmaceuticals: Consultancy; La Jolla Pharmaceutical: Research Funding; Celgene Corp.: Research Funding. Georgiev:Alnylam: Consultancy. Coates:Celgene Corp.: Consultancy; ApoPharma: Consultancy, Honoraria; Vifor Pharma: Consultancy; Sangamo: Consultancy, Honoraria. Voskaridou:Acceleron: Membership on an entity's Board of Directors or advisory committees, Research Funding; Celgene Corp: Membership on an entity's Board of Directors or advisory committees, Research Funding. Forni:Novartis: Research Funding; Roche: Research Funding; Celgene: Research Funding. Perrotta:Acceleron Pharma: Research Funding; Novartis: Research Funding. Lal:Celgene Corporation: Research Funding; Bluebird Bio: Research Funding; La Jolla Pharmaceutical Company: Consultancy, Research Funding; Insight Magnetics: Research Funding; Novartis: Research Funding; Terumo Corporation: Research Funding. Kattamis:ApoPharma: Honoraria; Vifor Pharma: Consultancy; CELGENE: Consultancy, Honoraria; Novartis: Consultancy, Honoraria. Vlachaki:Novartis: Honoraria. Origa:Cerus Corporation: Research Funding; Bluebird Bio: Consultancy; Novartis: Honoraria; Apopharma: Honoraria. Aydinok:TERUMO: Research Funding; Protagonist: Other: SSC; CRISPR Tech: Other: DMC; Cerus: Honoraria, Research Funding; La Jolla Pharmaceuticals: Research Funding; Novartis: Research Funding, Speakers Bureau; Celgene: Research Funding. Ho:Takeda: Honoraria, Other: travel to meeting; Novartis: Honoraria; Janssen: Honoraria; Amgen: Honoraria; Celgene: Other: Travel to meeting. Chew:Celgene: Research Funding. Tantiworawit:Celgene: Honoraria, Research Funding, Speakers Bureau. Shah:Novartis: Honoraria, Speakers Bureau; Sobi/Apotex: Honoraria; Celgene Corp: Other: Steering committee; Roche: Other: Advisory board meeting. Neufeld:Celgene Corp.: Consultancy, Other: Steering committee; Acceleron Pharma: Consultancy. Laadem:Celgene: Employment, Equity Ownership. Shetty:Celgene: Employment, Equity Ownership. Zou:Celgene Corporation: Employment, Equity Ownership. Miteva:Celgene Corporation: Employment, Other: grants. Zinger:Celgene Corporation: Employment. Linde:AbbVie: Equity Ownership; Abbott Laboratories: Equity Ownership; Fibrogen: Equity Ownership; Acceleron Pharma: Employment, Equity Ownership. Sherman:Acceleron Pharma: Employment, Equity Ownership. Hermine:AB Science: Consultancy, Equity Ownership, Honoraria, Research Funding; Celgene Corporation: Research Funding; Hybrigenics: Research Funding; Erythec: Research Funding; Novartis: Research Funding. Porter:Cerus: Honoraria; Agios: Honoraria; Novartis: Consultancy. Piga:La Jolla: Membership on an entity's Board of Directors or advisory committees, Research Funding; Bluebird Bio: Honoraria; Apopharma: Honoraria, Research Funding; Celgene Corp: Membership on an entity's Board of Directors or advisory committees, Research Funding; Novartis: Research Funding; Acceleron: Research Funding.

Introduction: Transfusion dependent thalassemia (TDT) requires regular transfusion of red cell concentrates (RBCC) to prevent the complications of anemia and excessive erythroid expansion. Despite donor testing, long-term transfusion has a substantial cumulative risk of transfusion-transmitted infection (TTI) due to undetected viruses, bacteria, and protozoa. Splenectomized (-S) TDT patients may have greater TTI morbidity than patients with spleens (+S); but may benefit from reduced use of red blood cell concentrates (RBCC) and reduced transfusion iron (Fe) loading. Pathogen reduction (PR) of RBCC with amustaline-glutathione (A-GSH) offers potential to reduce the risk of TTI. Objectives: To determine, the impact of PR-RBCC on hemoglobin (Hb) use, transfused Fe burden, incidence of RBC antibodies, and safety in -S and +S TDT patients. Methods: TDT patients at 3 sites, not stratified by spleen status, were prospectively enrolled in a two- period cross-over study randomized by sequence for RBCC preparation. Leukocyte reduced PR-RBCC (Test) were treated with 0.2mM amustaline and 20 mM GSH, re-suspended in saline-adenine-glucose mannitol (SAGM), and stored up to 35 days at 4°C. Leukocyte reduced conventional RBCC (Control) were suspended in SAGM and stored for up to 35 days at 4°C. Patients received 6 transfusions in each treatment sequence of Test or Control RBCC over ~ 5 months. Clinicians, blinded to RBCC Hb content and treatment sequence, ordered RBCC to maintain targeted pre-transfusion Hb thresholds of ~ 9-10 g/dL. Transfusion intervals or number of RBCC transfused were adjusted for clinical management. The primary efficacy outcome was assessed by non-inferiority (NI) analysis for Hb use (expressed as g/kg body weight/ day) using a pre-specified NI margin (≤ 15% of the observed Control mean). Results : Overall, mean (SD) Hb content (g) of 1024 Test RBCC = 54.6±5.9 (range: 39-73) and of 1008 Control RBCC = 55.6 ± 5.9 (range: 35-74) and varied widely. By intent-to-treat (ITT), 80 patients (40 +S and 40 -S) were transfused. For ITT patients (Table), the baseline Hb level (BL-Hb, g/dL) at first transfusion of Control periods was significantly lower than at Test periods; but the mean number of RBCC transfused, RBCC storage days, total Hb dose (g), and transfusion intervals were not significantly different for Test and Control. ITT analysis for all transfusion episodes showed Hb use for Test RBCC (0.110 g/kg/d) was not different from Control RBCC (0.112 g/kg/day). Non-inferiority was demonstrated (T-C = - 0.002 g/kg/d: 95% CI: -0.005, 0.001). ITT Test patients received a slightly lower mean total Hb dose (- 14g), and mean pre-transfusion Hb levels declined after 6 transfusions (9.4 to 8.8 g/dL). -S patients had lower BL-Hb levels (g/dL) than S+ patients in Test (9.2 vs 9.7) and Control (8.8 vs 9.2) periods (Table). -S patients received a lower mean total Hb dose of Test than Control RBCC (p=0.019); and had a decline in mean pre-transfusion Hb levels during Test periods (from 9.2 to 8.7 g/dL). Transfusion intervals were significantly longer for -S patients than +S patients with both Test and Control RBCC (p< 0.001 by 2-sample t test, respectively); and -S patients had lower Hb use than +S patients. However, Hb use of Test and Control RBCC was comparable within -S and + S cohorts (Table). Transfused Fe was less for -S patients for Test and Control RBCC. During 6 Test and 3 Control treatment periods, 8 patients (6 -S, 2 +S) had worsening anemia with pre-transfusion Hb levels (6.0-7.8 g/dL) substantially below the targeted transfusion threshold, but without evidence of hemolysis. Each of these patients received one or more Hb doses below the average RBCC transfusion episode dose (Test: 114.5 g) or (Control: 116.7 g); and 3 patients had concurrent infections. None of 80 patients had evidence of increased RBC clearance, developed antibodies to PR-RBCC, or had treatment emergent RBC alloantibodies in either treatment period. There were no differences in the overall safety profiles for Test and Control RBCC. Conclusions: Amustaline-GSH PR treatment of RBCCs offers the potential to reduce TTI risk without impacting Hb use or Fe burden in TDT. However, Hb content of Test and Control RBCC varies widely and may contribute to unexpected changes in pre-transfusion Hb levels. Spleen status affected Hb use comparably for PR-RBCC and Control RBCC, and remains an important factor in assessing transfusion requirements and Fe loading. Table. Table. Disclosures Aydinok: TERUMO: Research Funding; Cerus: Honoraria, Research Funding; CRISPR Tech: Other: DMC; Protagonist: Other: SSC; La Jolla Pharmaceuticals: Research Funding; Celgene: Research Funding; Novartis: Research Funding, Speakers Bureau. Piga:Apopharma: Honoraria, Research Funding; Celgene Corp: Membership on an entity's Board of Directors or advisory committees, Research Funding; La Jolla: Membership on an entity's Board of Directors or advisory committees, Research Funding; Bluebird Bio: Honoraria; Acceleron: Research Funding; Novartis: Research Funding. Origa:Novartis: Honoraria; Bluebird Bio: Consultancy; Cerus Corporation: Research Funding; Apopharma: Honoraria. Mufti:Cerus Corporation: Employment, Equity Ownership. Erikson:Cerus Corporation: Employment, Equity Ownership. North:Cerus Corporation: Employment, Equity Ownership. Waldhaus:Cerus Corporation: Employment, Equity Ownership. Ernst:Cerus Corporation: Employment, Equity Ownership. Lin:Cerus Corporation: Employment, Equity Ownership. Huang:Cerus Corporation: Employment, Equity Ownership. Benjamin:Cerus Corporation: Employment, Equity Ownership. Corash:Cerus Corporation: Employment, Equity Ownership.

WOS: 000275981900009, PubMed ID: 19996412, Cardiac iron overload causes most deaths in beta-thalassemia major. The efficacy of deferasirox in reducing or preventing cardiac iron overload was assessed in 192 patients with beta-thalassemia in a 1-year prospective, multicenter study. The cardiac iron reduction arm (n = 114) included patients with magnetic resonance myocardial T2* from 5 to 20 ms (indicating cardiac siderosis), left ventricular ejection fraction (LVEF) of 56% or more, serum ferritin more than 2500 ng/mL, liver iron concentration more than 10 mg Fe/g dry weight, and more than 50 transfused blood units. The prevention arm (n = 78) included otherwise eligible patients whose myocardial T2* was 20 ms or more. The primary end point was the change in myocardial T2* at 1 year. In the cardiac iron reduction arm, the mean deferasirox dose was 32.6 mg/kg per day. Myocardial T2* (geometric mean +/- coefficient of variation) improved from a baseline of 11.2 ms (+/- 40.5%) to 12.9 ms (+/- 49.5%) (+ 16%; P < .001). LVEF (mean +/- SD) was unchanged: 67.4 (+/- 5.7%) to 67.0 (+/- 6.0%) (-0.3%; P = .53). In the prevention arm, baseline myocardial T2* was unchanged from baseline of 32.0 ms (+/- 25.6%) to 32.5 ms (+/- 25.1%) (+ 2%; P = .57) and LVEF increased from baseline 67.7 (+/- 4.7%) to 69.6 (+/- 4.5%) (+ 1.8%; P < .001). This prospective study shows that deferasirox is effective in removing and preventing myocardial iron accumulation. This study is registered at http://clinicaltrials.gov as NCT00171821. (Blood. 2010; 115: 2364-2371), Novartis Pharma AG; Novartis Pharmaceuticals; British Heart FoundationBritish Heart Foundation [PG/09/074/27961]; National Institute for Health ResearchNational Institute for Health Research (NIHR) [NF-SI-0508-10081], This study was sponsored by Novartis Pharma AG. Financial support for medical editorial assistance was provided by Novartis Pharmaceuticals.

BACKGROUND: Ruxolitinib (RUX) is approved in adult patients (pts) with myelofibrosis (MF), and in pts with polycythemia vera (PV) who are resistant/intolerant to hydroxyurea. Splenomegaly, a key clinical feature in advanced MF/PV, is also common in pts with transfusion-dependent thalassemia (TDT). In pts with TDT, splenomegaly worsens anemia, leading to increased transfusion requirement (TR). Similar to murine models of MF (Ostojic A, 2012), JAK2 inhibition led to a decrease in spleen size in murine models of thalassemia (Musallam KM, 2013). Additionally, thalassemia-related ineffective erythropoiesis was associated with hyperactivation of JAK-STAT pathway in preclinical studies. These findings indicate that RUX treatment (Tx) might benefit pts with TDT and splenomegaly. Present exploratory study aims to evaluate the effect of RUX Tx on TR, spleen volume (SV), and pre-transfusion hemoglobin (Hgb) levels. METHODS: TRUTH is a single-arm, multicenter, phase 2a study exploring the efficacy and safety of RUX in regularly transfused adult pts (N = 30) with thalassemia and splenomegaly, for 30 weeks (core study). Starting dose of RUX was 10 mg twice daily (maximum dose of 25 mg in 5 mg/10 mg increments). Pts were required to receive iron chelation (deferoxamine/deferasirox) for at least 4 week prior to screening and throughout the study. Primary end point was the percent change of red blood cells (RBCs) transfused between week 6 to 30 vs baseline period (BL; defined as period between 24 weeks prior to start of Tx and week 0). Change of SV from BL (by MRI/CT) at week 12 and week 30 was a secondary end point. Other secondary end points included safety (N = 30, safety set) and change of pre-transfusion Hgb level from BL. RESULTS: Of the 30 pts enrolled (median age, 24 years; 60% male), 26 completed the core phase at week 30 and 4 discontinued before week 30 (adverse event [AE], N = 2; withdrew consent, N = 1; subject/guardian decision, N = 1). Of those 26 who completed core Tx, 20 pts continue to receive RUX beyond the core study via other mechanisms. The median duration of exposure during the core phase was 30.2 weeks and median actual dose intensity of RUX was 27.2 mg/day (range, 13.3-39.0 mg/day). Mean hematocrit (HCT) adjusted volume of transfused RBC per 4 weeks was 605 mL for the BL period and 560 mL for the on-Tx period (between week 6-30; N = 27, per protocol set; 3 pts received < 18 weeks of Tx). Mean percent change of transfusion rate was −5.9 (95% CI: −14.7, 2.83). Change of HCT adjusted transfused volume per 4 weeks for on-Tx period vs BL is shown in Figure 1A. The percent change from BL in SV at week 30 is represented in Figure 1B. The mean SV reduction from BL at week 12 (N = 26) and week 30 (N = 25) was −19.7% and −26.8%, respectively. A slight trend for improvement was observed in the median pre-transfusion Hgb levels over time (pre-Tx = 8.4 g/L; end of study [week 24-30] = 8.9 g/L). At BL, 77% (23/30) of pts had Hgb levels below LLN but ≥ 8 g/dL and 20% (6/30) of pts had Hgb levels < 8 g/dL. At BL, 20% (6/30) of pts had a platelet (PLT) count below LLN but > 50 × 109/L, while no pt had PLT counts < 50 × 109/L. Worst post-BL hematologic abnormalities were Hgb (< 8g/dL, [hypo] = 17 pts [57%]), and PLT counts (< 50 × 109/L [hypo] = 1 pt [3%]). The most common AEs (all grade [G], ≥ 5%, regardless of study drug relationship) were upper respiratory tract infection (27%), nausea (20%), and upper abdominal pain/anemia/diarrhea/weight increased [each = 17%]). Overall, 25 pts experienced AEs, 11 pts had G 3 or 4 AEs, and 6 pts had serious AEs (regardless of study drug relationship); while, 13 pts experienced AEs, 5 pts had G 3 or 4 AEs, and 3 pts had serious AEs that were suspected to be related to the study drug. No deaths were reported during the study. AEs led to dose reduction/study Tx interruption in 9 pts (regardless of study drug relationship [≥ 5%]: nausea [all G = 2 pts (7%); G 3 or 4 = 1 pt (3%)] and vomiting [all G = 2 pts (7%); G 3 or 4 = 1 pt (3%)]). CONCLUSION: RUX Tx showed a trend for improvement in transfused red cells and a slight improvement in pre-transfusion Hgb; while, there was a noticeable reduction in SV over time. As per investigator assessment of clinical benefit, a majority of pts continued Tx beyond the core study. RUX was well tolerated in the study population with modest incidences of G 3 or 4 and serious AEs, with no new safety findings. Given the sustained decrease in SV, further studies could be valuable to determine if RUX Tx may be an alternative to splenectomy in pts with TDT. Disclosures Aydinok: Shire: Research Funding; Cerus: Research Funding; Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Karakas:Novartis: Research Funding. Siritanaratkul:Jansen-Cilag: Research Funding; Novartis: Research Funding; Roche: Research Funding; Pfizer: Research Funding. Kattamis:Novartis: Honoraria, Research Funding; ApoPharma: Honoraria. Hollaender:Novartis: Employment. Mahuzier:Novartis: Employment. Gadbaw:Novartis: Employment. Taher:Novartis: Honoraria, Research Funding; Celgene: Research Funding.

Background Ascorbic acid (AA) supplementation has traditionally been used in iron overloaded patients as means to increase iron chelation efficacy and replenish AA oxidized by labile iron found in those patients. The rationale leaned on AA's ability to render stored iron accessible to chelation, as found in urinary iron excretion following deferoxamine infusion. However, as AA increases labile iron redox-cycling and ensuing toxicity, we set to assess the long term benefits versus toxicity risks of the combined chelator-AA treatment. Objectives Perform a prospective, open-label, randomized and controlled 1 year study on thalassemia patients treated with deferasirox (DFX) in order to assess the effects of AA supplementation on: a. markers of systemic iron overload in selected organs and in plasma and b. markers of plasma labile iron (LPI) as potential contributors to oxidative stress toxicity. Patients and Methods Enrolment: 22 beta thalassemia major (TM) patients ≥10 years treated >2 years with DFX. Exclusion: cardiac dysfunction/arrhythmia or mT2* MRI Results 22 TM patients were enrolled (mean age 23.5, range 10-34 y). The average dose ± SD of DFX given to all 22 patients was 38±4.5 mg/kg/d. 11 patients were randomised to receive DFX and the others with DFX supplemented with 125 mg AA (mean 2.4±0.5, range 1.9-4.2 mg/kg) for 1 year. At BL, the AA levels were significantly lower in the TM group compared to controls (2.44 ± 3.38 vs 9.60± 4.36 mg/dl respectively, p-2SD of control group whereas the other 11 patients showed normal ranges of AA. The AA deficient patients were those that showed significantly higher SF, LIC and lower mT2* at BL (Table 1). In the DFX+AA arm, 5/11 (45%) patients had subnormal AA levels at BL but attained normal status after 1 year, as did all others on AA. Of the 5/11 (45%) DFX-treated patients that did not receive AA had normal BL AA and only 2/11 maintained normal AA status at EOS. A significant correlation was obtained between BL SF, LIC and mT2* and e-LPI (r 0.49, p 0.025; r 0.57, p 0.01; r -0.43, p 0.057 respectively) but not with LPI. The changes associated with DFX alone or with AA from BL to EOS were subtle for all parameters measured (Table 2). Importantly, eLPI and LPI remained at basal levels throughout 6 months treatment in both arms. With DFX alone, LPI were 0.34±0.30 units (mM iron) (BL) & 0.63±0.58 (6 mo); eLPI: 1.71±1.93 at BL & 2.48±3.11 (6 mo). DFX+AA: LPI were 0.33±0.46 (BL) & 0.35±0.44 (6 mo); eLPI: 2.13±1.71 (BL) & 1.78±1.51 (6 mo). Conclusions TM patients on long term DFX without AA supplementation showed subnormal, AA levels. This was most pronounced in TM patients with higher liver and heart iron. The addition of AA to DFX normalized the AA levels but did not increase the e-LPI and LPI during 6 mo, indicating no apparent risk of iatrogenic toxicity by AA to DFX. Moreover, AA may enhance the efficacy of DFX in cardiac and hepatic iron. The small rise in SF versus fall in LIC in the DFX+AA arm might need further exploration. Table 1 Baseline characteristics of patients based on AA status Table 1. Baseline characteristics of patients based on AA status Table 2 Changes in iron overload markers in patients treated with DFX or DFX+AA over 1 year Table 2. Changes in iron overload markers in patients treated with DFX or DFX+AA over 1 year Disclosures Aydinok: Novartis Pharmaceuticals: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Cerus: Research Funding; Shire: Research Funding. Cabantchik:Aferrix: Consultancy, Membership on an entity's Board of Directors or advisory committees; Hinoman: Consultancy; Novartis Pharmeceuticals: Honoraria, Speakers Bureau; Apopharma: Honoraria, Speakers Bureau.

Background: Efficacy and safety of iron chelation with deferasirox (Exjade®; DFX) 5 and 10 mg/kg/day (escalated to max: 20 mg/kg/day) in non-transfusion-dependent thalassemia patients, was established in the placebo-controlled, THALASSA study; Taher et al Blood 2012;120:970-977. THETIS added to this evidence by investigating a broader patient population, including non-transfusion-dependent congenital anemia patients and those treated with concomitant medications (eg hydroxyurea) and by evaluating early escalation with higher DFX doses according to liver iron concentration (LIC; max: 30 mg/kg/day). Methods: Patients ≥10 yrs of age with iron overload (LIC ≥5 mg Fe/g dry weight [dw]) and serum ferritin (SF) ≥300 ng/mL were enrolled. Exclusion criteria included: blood transfusions within 6 months of study enrollment or anticipated regular transfusions (unplanned transfusions allowed); Hb S/β thalassemia; active hepatitis B/C; cirrhosis; history of clinically relevant ocular and/or auditory toxicity; on two consecutive measurements: alanine aminotransferase (ALT) >5×the upper limit of normal (ULN), serum creatinine >ULN, creatinine clearance ≤40 mL/min, or urine protein/urine creatinine ratio >1.0 mg/mg. All patients started DFX at 10 mg/kg/day. At week 4, DFX was increased according to baseline (BL) LIC: LIC >15, 20 mg/kg/day; LIC >7-≤15, 15 mg/kg/day; LIC ≥5-≤7, 10 mg/kg/day. At week 24, DFX was adjusted further: LIC >15, +5-10 mg/kg/day (max 30 mg/kg/day); LIC >7-≤15, +5 mg/kg/day (max 20 mg/kg/day); LIC ≥3-≤7, same dose. If LIC Results: 134 patients were enrolled consisting of β thalassemia intermedia (n=69), Hb H disease (n=40), Hb E/β thalassemia (n=24) and congenital dyserythropoietic anemia (n=1) patients. Mean actual daily DFX dose ± SD over 1 yr (considering dose adjustments) was 14.70 ± 5.48 mg/kg/day. Mean LIC ± SD decreased significantly from 15.13 ± 10.72 mg Fe/g dw at BL to 8.46 ± 6.25 mg Fe/g dw at week 52 (absolute change, ‒6.68 ± 7.02 mg Fe/g dw [95% CI: -7.91, -5.45]; P 112 (83.58%) patients completed 1 yr. Patients discontinued primarily because of withdrawal of consent (n=10, personal/logistical reasons). Adverse events (AE) regardless of causality were reported in 97 (72.4%) patients and were unaffected by average dose. AEs with a suspected relationship to DFX were reported in 42 (31.3%) patients; most commonly, gastrointestinal (abdominal discomfort, diarrhea, nausea; n=6 each). One patient had a suspected drug-related serious AE (pancreatitis) that lasted 11 days; DFX was withheld for the duration, then restarted. One patient discontinued because of an AE (extramedullary hematopoiesis) and one death occurred (pneumonia leading to cardiac failure); neither suspected as drug-related. One patient had an elevated BL ALT 2×ULN that increased to >5×ULN on one occasion; BL bilirubin levels were 2×ULN and alkaline phosphatase 1.5×ULN; without dose adjustment or interruption, all parameters improved better than baseline values by week 52. No patient had two consecutive serum creatinine increases >33% above BL or >ULN. All patients with notable renal or liver laboratory values continued treatment. Conclusions: DFX 10 mg/kg/day (escalated to max: 30 mg/kg/day) resulted in significant and clinically relevant reductions in iron overload, with a similar safety profile as reported in THALASSA (in both DFX- and placebo-treated patients). With early dose escalation at week 4 with further adjustment at week 24, patients with a higher iron burden received higher DFX doses. These results support early dose escalation of DFX to optimize chelation in more heavily iron-overloaded patients with non-transfusion-dependent anemias. Disclosures Taher: Novartis: Honoraria, Research Funding. Cappellini:Celgene: Membership on an entity's Board of Directors or advisory committees; Genzyme/Sanofi: Membership on an entity's Board of Directors or advisory committees; Novartis: Membership on an entity's Board of Directors or advisory committees. Aydinok:Cerus: Research Funding; Sideris: Research Funding; Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Porter:Novartis: Consultancy, Honoraria, Research Funding; Shire: Consultancy, Honoraria; Celgene: Consultancy. Karakas:Novartis: Research Funding. Viprakasit:Novartis: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; GPO, Thailand: Honoraria, Research Funding; Shire: Research Funding. Siritanaratkul:Pfizer: Research Funding; Roche: Research Funding; Novartis: Research Funding; Janssen-Cilag: Research Funding. Kattamis:Novartis: Research Funding, Speakers Bureau; ApoPharma: Speakers Bureau. Wang:Novartis: Employment. Zhu:Novartis: Employment. Joaquin:Novartis: Employment. Uwamahoro:Novartis: Employment.

Background: Although non-transfusion-dependent thalassemias (NTDT) and non-transfusion-dependent congenital or chronic anemias are found in Southern China, they are relatively rare diseases in China and there are little data evaluating iron chelation in Chinese patients. This 1-year analysis from the THETIS study investigated the efficacy and safety of deferasirox in a large subpopulation of Chinese patients. Early escalation of deferasirox doses (max: 30 mg/kg/day) was evaluated according to liver iron concentration (LIC). Methods: THETIS is an open-label, single-arm, multicenter, Phase IV, 5-year study with the primary endpoint after 1 year of treatment. For this subanalysis, Chinese patients ≥10 years of age with iron overload (LIC ≥5 mg Fe/g dry weight [dw] and serum ferritin [SF] ≥300 ng/mL) were enrolled. Exclusion criteria included: blood transfusions within 6 months of study enrollment or anticipated regular transfusions (unplanned transfusions allowed), Hb S/β thalassemia, active hepatitis B/C, cirrhosis, history of clinically relevant ocular and/or auditory toxicity; on two consecutive measurements: alanine aminotransferase >5× the upper limit of normal (ULN), serum creatinine >ULN, creatinine clearance ≤40 mL/min, or urine protein/urine creatinine ratio >1.0 mg/mg. All patients started deferasirox at 10 mg/kg/day. At week 4, deferasirox was increased according to baseline LIC (LIC >15, 20 mg/kg/day; LIC >7-≤15, 15 mg/kg/day; LIC ≥5-≤7, 10 mg/kg/day). At week 24, deferasirox was adjusted further: LIC >15, +5-10 mg/kg/day (max 30 mg/kg/day); LIC >7-≤15, +5 mg/kg/day (max 20 mg/kg/day); LIC ≥3-≤7, same dose. If LIC Results: 68 Chinese patients were enrolled (median age 26.0, range 10-63 years) with Hb H disease (n=35), β thalassemia intermedia (n=21) or Hb E/β thalassemia (n=12). Most patients received prior transfusions (n=56/68, 82.4%); 20/68 (29.4%) patients received prior chelation. 57/68 (83.82%) patients completed 1 year. Patients who discontinued were most commonly lost to follow-up (n=4) or withdrew consent (n=3, personal or logistical reasons). Mean actual daily deferasirox dose ± standard deviation (SD) over 1 year (considering dose adjustments), was 16.21 ± 5.61 mg/kg/day. Mean LIC ± SD at baseline was 17.75 ± 12.37 mg Fe/g dw in Chinese patients, which decreased to 9.35 ± 6.83 mg Fe/g dw at week 52 (absolute change from baseline, -8.51 ± 8.58 mg Fe/g dw [95% CI -10.69 to -6.33]). Patients with higher LIC at baseline experienced a greater reduction in LIC by week 52 (Figure). Furthermore, 48 (70.6%) Chinese patients achieved an absolute decrease in LIC of ≥3 mg Fe/g dw, and 46 (67.6%) patients achieved a ≥30% relative reduction in LIC at the last assessment. At week 52, LIC was Adverse events (AE) regardless of causality were reported in 40 (58.8%) Chinese patients. Drug-related AEs were reported in 18 (26.5%) Chinese patients, most commonly gastrointestinal (abdominal discomfort, n=2; diarrhea and hematochezia, n=1 each) or skin related (rash, n=3; eczema, n=1). No patients discontinued because of AEs. One death occurred during the study (pneumonia leading to cardiac failure) that was not suspected to be drug-related. No patient had two consecutive serum creatinine increases of >33% above baseline or >ULN. No patient discontinued treatment due to notable liver or renal laboratory values. Conclusions: Deferasirox at 10 mg/kg/day escalated to a maximum of 30 mg/kg/day effectively reduced iron burden in Chinese patients. AEs were consistent with the known safety profile for deferasirox. Early dose escalation at week 4 and further adjustment at week 24 ensured that patients with iron overload achieved clinically relevant reductions in iron burden. These results were in alignment with the THETIS primary efficacy analysis, supporting early dose escalation of deferasirox to optimize chelation in more heavily iron-overloaded Chinese NTDT patients. Figure 1. Figure 1. Disclosures Cappellini: Celgene: Membership on an entity's Board of Directors or advisory committees; Genzyme/Sanofi: Membership on an entity's Board of Directors or advisory committees; Novartis: Membership on an entity's Board of Directors or advisory committees. Aydinok:Cerus: Research Funding; Sideris: Research Funding; Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Porter:Novartis: Consultancy, Honoraria, Research Funding; Shire: Consultancy, Honoraria; Celgene: Consultancy. Zhu:Novartis: Employment. Wang:Novartis: Employment. Qi:Novartis: Employment. Taher:Novartis: Honoraria, Research Funding.

Background: Availability of cardiac magnetic resonance imaging (CMR) to evaluate myocardial T2* (hereafter mT2*) in the management of cardiac siderosis is restricted in certain regions of the world. Hence, identifying predictors of mT2* changes would be valuable. Although appropriate chelation therapy is shown to reduce cardiac iron overload, data linking mT2* response to patient characteristics and other clinical measurements is limited. The objective of this analysis was to identify a model of the strongest predictors of mT2*, which did not require magnetic resonance imaging (MRI). A multivariate analysis on the 3-year EPIC (ICL670A2409) cardiac data was performed, using serum ferritin (SF) and other clinical characteristics. Methods: EPIC cardiac 3 year sub-study evaluating thalassemia major patients, has been described previously (Pennell et al., 2012). All patients included in this analyses, received deferasirox and had at least one mT2* value during the second of year of the extension. Two response variables were analyzed: mT2* (normalized by log transformation) at end of study (EOS) and relative change (%) in mT2*. Predictor variables were selected based on potential clinical impact on mT2*, assuming limited MRI availability, and included age at baseline (BL), gender, average drug dose, SF at BL, relative change in SF, and log (mT2*) at BL. Pairwise correlations were evaluated to assist in the model development. Multiple linear regression (MLR) analysis using forward selection, backward elimination and stepwise, was performed to identify the best model and those variables significantly contributing to the model to predict relative change in mT2* and EOS mT2*. Results are presented (Table) as adjusted R2 (adj-R2) indicative of predictive ability of the model (higher the better), variables significantly contributing to the model (at a significance level of 0.1 used in the model selection process), and parameter estimates which assess the influence of each of the variables tested, has on the overall model. SAS PROC GLM and GLMSELECT were used for analysis. Results: Of the 71 patients who continued into 3rd year of this study, 64 patients were evaluable for this analysis. Pearson univariate correlation analyses evaluating relative change in mT2* and a number of variables, demonstrated the strongest correlation with relative change in SF (r=-0.5067; P Discussion : Previous publications have evaluated the relationship between absolute value of SF and mT2* and have demonstrated a relatively weak correlation (Anderson et al., 2001; Eghbali et al., 2014). The current analyses, further evaluates this relationship but considers relative change in SF as a predictor of mT2* response as well as the potential influence of other clinical characteristics. This analysis is the first to demonstrate a moderate correlation between relative change in SF and relative change in mT2*. Within the MLR Model 1, considering other clinical characteristics, relative change in SF had the most influence on the predictability of relative change in mT2*. Hence, there appears to be a relationship between the trajectory in the change in SF and relative change in mT2* which has not been previously identified, although, the overall model accounted for only 33% of the variability. Further analyses of shorter time points of SF would be helpful in providing more information on utility of SF change as a useful parameter in monitoring mT2* in absence of CMR. Figure 1 Figure 1. Disclosures Porter: Novartis: Consultancy, Honoraria, Research Funding; Shire: Consultancy, Honoraria; Celgene: Consultancy; Cerus: Membership on an entity's Board of Directors or advisory committees; Alnylam: Membership on an entity's Board of Directors or advisory committees. Taher:Novartis Pharma: Honoraria, Research Funding. Aydinok:Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. El-Ali:Novartis: Employment. Chakravarty:Novartis: Employment. Cappellini:Novartis Pharma: Honoraria, Speakers Bureau; Genzyme: Honoraria.

Background: Heart failure due to iron-induced cardiomyopathy is rare yet remains one of the leading causes of death in patients with β thalassemia. Using myocardial T2* (mT2*) cardiovascular magnetic resonance (CMR) to estimate myocardial iron burden has improved the management of cardiac siderosis. Myocardial T2* >20 ms is considered normal and as iron accumulates, mT2* reduces, with values Methods: Patients aged ≥10 years with mT2* >5 to 2500 ng/mL, MR (R2) liver iron concentration >10 mg Fe/g dry weight (dw) and ≥50 lifetime transfused blood units were included in the study. Cardiac iron removal was analyzed over 3 years in patients with mT2* at baseline and each considered time point. Post-hoc calculation of MIC from mT2* values was conducted using the formula described by Carpenter et al as follows: [Fe] = 45.0 x (mT2*)−1.22 where [Fe] is measured in milligrams per gram dw and mT2* is measured in milliseconds. Data are presented descriptively as the percentage of the progression of the patients toward achieving normalization of mT2* (>20 ms) or MIC (>1.16 mg Fe/g dw as derived from the formula based on normal mT2*) by mT2* at baseline: >5 to Results: Data were analyzed at Month 12 (n=67: baseline mT2* >5 to 5 to 5 to Figure 1 Figure 1. Discussion: The calibration of the relationship between CMR measurements and MIC by Carpenter et al allows an additional assessment to mT2* to determine chelator efficacy in terms of the actual concentration of iron in the myocardium. Here we show that, particularly in patients with severe myocardial iron overload, when analyzing the progression towards normalization, improvement in MIC is proportionally greater than that seen with mT2*. It could be interpreted that a small improvement (ie 1 ms) in mT2* when baseline values are >5 to Disclosures Porter: Novartis: Consultancy, Honoraria, Research Funding; Shire: Consultancy, Honoraria; Celgene: Consultancy; Cerus: Membership on an entity's Board of Directors or advisory committees; Alnylam: Membership on an entity's Board of Directors or advisory committees. Taher:Novartis: Honoraria, Research Funding. Aydinok:Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. El-Ali:Novartis: Employment. Barbier:Novartis: Employment. Cappellini:Novartis: Honoraria, Speakers Bureau; Genzyme: Honoraria.

Background Serum ferritin is regularly used to assess response to chelation therapy and correlates significantly with liver iron concentration (LIC) particularly when LIC is The aim of this post-hoc analysis of the EPIC study was to gain insight into the relationship between serum ferritin and LIC in response to deferasirox over 1 year, in a large patient cohort, so that serum ferritin trends can be more clearly interpreted and evidence-based practical guidance be given for patients with transfusion-dependent thalassemia (TDT). Methods TDT patients were recruited from 25 sites, received 1-year of deferasirox treatment and had serum ferritin and R2 magnetic resonance imaging (R2-MRI)-assessed LIC measurements at baseline and 1 year. Summary statistics are provided for serum ferritin and LIC responders (decrease, any change from baseline Results Of the 374 patients analyzed in the EPIC liver MRI substudy, 317 had TDT, of which 72.7% (n=226) had a serum ferritin response and 27.3% (n=85) had no response. Importantly, after 1 year LIC decreased in approximately half of serum ferritin nonresponders (51.8%; n=44; Table) and in 79.6% of serum ferritin responders (n=180). Median (min, Q1, Q3, max) change in LIC (mg Fe/g dw) was –5.4 (–38.5, –11.7, –0.9, 15.4) in serum ferritin responders and –0.2 (–18.4, –2.6, 2.7, 19.6) in nonresponders. Median (range) transfusional iron intake (mg/kg/day) was similar in serum ferritin responders (0.30 [0.01–1.49]) and nonresponders (0.37 [0.02–1.00]). Median deferasirox dose (mg/kg/day) was higher in serum ferritin responders than nonresponders (28.1 [9.8–40.4] vs 23.7 [9.7–37.9]). Evaluation of responses by baseline serum ferritin showed that a greater proportion of serum ferritin responders with baseline serum ferritin Assessment by change in serum ferritin and LIC quadrants indicated that patients without serum ferritin or LIC response had the lowest baseline median (range) serum ferritin and LIC (2155 [480–9725] ng/mL; 11.9 [1.8–37.5] mg Fe/g dw; n=41), and received a lower median deferasirox dose (23.7 [9.7–36.0] mg/kg/day). Overall, median LIC decrease (mg Fe/g dw) was smaller in patients with baseline serum ferritin Discussion and conclusions A decrease in LIC was seen in ~80% of serum ferritin responders after 1 year of deferasirox; a greater proportion of serum ferritin responders (88%) decreased LIC when baseline serum ferritin was Figure 1 Figure 1. Disclosures Porter: Novartis: Consultancy, Honoraria, Research Funding; Shire: Consultancy, Honoraria; Celgene: Consultancy; Cerus: Membership on an entity's Board of Directors or advisory committees; Alnylam: Membership on an entity's Board of Directors or advisory committees. Taher:Novartis: Honoraria, Research Funding. Sutcharitchan:Novartis: Research Funding. Aydinok:Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Chakravarty:Novartis: Employment. El-Ali:Novartis: Employment.

Introduction. ACE-536, a recombinant fusion protein containing modified activin receptor type IIB and IgG Fc, is being developed for the treatment of anemias due to ineffective erythropoiesis (IE), such as beta-thalassemia (β-thal). In β-thal, IE is due to intracellular α-globin aggregates causing premature death of late-stage erythroid precursors. Patients with β-thal often have elevated levels of EPO and are unresponsive to erythropoiesis-stimulating agents (ESAs). ACE-536 binds to ligands in the TGF-β superfamily, such as GDF11, and promotes late-stage erythroid differentiation via a mechanism distinct from ESAs. In a healthy volunteer study, ACE-536 was well-tolerated and increased hemoglobin (Hb) levels (Attie K et al., Am J Hematol 2014). Murine ACE-536 (RAP-536) increased Hb levels and decreased RBC inclusion bodies and hemolysis in a mouse model of β-thal (Suragani R et al., Blood 2014). Aims. This is an ongoing, phase 2, multicenter, open-label, dose-finding study to evaluate the effects of ACE-536 in adults with transfusion-dependent (TD, defined as ≥4 units RBCs/8 weeks prior to baseline) or non-transfusion dependent (NTD, defined as Methods. Inclusion criteria included age ≥ 18 yr and anemia, defined as either being TD patient or having baseline Hb Results. Preliminary data were available for the 30 patients (23 NTD/7 TD) enrolled in the first 5 cohorts as of 18 Jul 2014. Median age was 34.5 yr (range: 20-57 yr), 16 (53%) were male and 83% had prior splenectomy. Mean (SD) baseline Hb for the NTD patients was 8.3 (0.9) g/dL. Efficacy data for the NTD patients in the 0.6 to 1.0 mg/kg cohorts demonstrated a maximum increase from baseline in Hb ≥ 1.5 g/dL in 7 of 11 (64%) patients. Efficacy data for the 7 TD patients treated in the 0.6 to 1.0 mg/kg cohorts demonstrated a >50% reduction in transfusion burden for all 7 patients. This was accompanied by a maximum decrease from baseline in serum ferritin levels ranging from 12-60%. Reductions in liver iron concentration by MRI were observed in both NTD and TD patients. Two patients with long-standing leg ulcers at baseline (one NTD, one TD) healed within approximately 3 months of ACE-536 treatment. ACE-536 was generally well tolerated. No related serious adverse events have been reported to date. The most frequent related adverse events included bone pain, headache and myalgia. No notable changes in platelets or WBC were observed. Conclusions. Based on preliminary data, ACE-536 administered SC every 3 weeks for up to 5 doses increased Hb levels in NTD patients and decreased transfusion requirement and serum ferritin levels in TD patients with β-thalassemia via a novel mechanism of action, and demonstrated a favorable safety profile. These data strongly support further evaluation of ACE-536 in patients with β-thalassemia. Disclosures Piga: Acceleron Pharma: Research Funding; Celgene: Honoraria; Novartis: Research Funding; ApoPharma: Research Funding. Voskaridou:Celgene Coporation: Membership on an entity's Board of Directors or advisory committees. Condon:Acceleron Pharma: Employment, Equity Ownership. Wilson:Acceleron Pharma: Employment, Equity Ownership. Sherman:Acceleron Pharma: Employment, Equity Ownership. Attie:Acceleron Pharma: Employment, Equity Ownership.

Background Cardiac iron removal is relatively slow and patients with cardiac siderosis can take years to normalize cardiac T2* to >20 ms. Prospective comparison of iron chelators are mostly limited to studies of 1-yr duration. CORDELIA is a large randomized trial comparing deferasirox (DFX) with deferoxamine (DFO) in patients with β-thalassemia major (TM), which demonstrated the non-inferiority of DFX vs DFO for cardiac iron removal at 1 yr, with a trend for superiority of DFX (P=0.057). This 1-yr extension was planned to collect additional data on efficacy and safety of DFX and DFO in patients with cardiac siderosis when treated for up to 2 yr. Methods Study design has been reported previously (Pennell Blood 2012; abst 2124). Patients enrolled had cardiovascular magnetic resonance-measured cardiac T2* 6–20 ms, left ventricular ejection fraction (LVEF) ≥56%, and R2-magnetic resonance imaging liver iron concentration (LIC) ≥3 mg Fe/g dw. Patients completing 1 yr were eligible to continue on DFX or DFO as assigned, or to switch treatment on entering the extension if judged by the investigator to be of therapeutic benefit. Target doses were an intensified DFO regimen of 50–60 mg/kg/d sc for 8–12 h, 5–7 d/wk, or DFX at 40 mg/kg/d. Efficacy is reported for changes from core baseline (BL). Safety was monitored continuously. Results for patients continuing with DFX or DFO are reported here. Results In total, 160/197 patients completed 1 yr; 74 patients continued into the extension on DFX (mean age 20.1 ± 6.9 yr; 59.5% male) and 29 patients on DFO (17.0 ± 5.4 yr; 58.6%). At core BL, 29.7% DFX patients had cardiac T2* Mean dose over 2 yr was 35.5 ± 6.3 mg/kg/d DFX, and 57.0 ± 13.3 mg/kg/d DFO for 5 d/wk (40.7 ± 9.5 mg/kg/d for 7 d/wk). Overall, 99.1 and 98.1% of the planned DFX and DFO dose was taken, respectively. At month 24, cardiac T2* increased to 15.9 ms (CV 43.4) in DFX patients (Gmean ratio of month 24/BL 1.38 [95% CI 1.28, 1.49]) and to 14.2 ms (CV 37.3) in DFO patients (ratio 1.33 [1.13, 1.55]), indicating a 38 and 33% improvement, respectively (Fig A). Estimation of cardiac iron concentration (CIC) showed decreases during 2-yr treatment with both DFX and DFO (Fig B). Mean LVEF was stable and remained within normal limits with both DFX (change at month 24: +0.6 ± 4.7%) and DFO (–0.6 ± 5.0%). LIC decreased to 14.4 ± 16.6 mg Fe/g dw at month 24 in DFX patients (–15.7 ± 15.2 mg Fe/g dw; 95% CI –19.7, –11.8) and to 11.0 ± 12.1 mg Fe/g dw in DFO patients (–26.0 ± 14.9 mg Fe/g dw; 95% CI –32.3, –19.7). Over 2 yr, most common AEs (>10%) regardless of causality for DFX were upper respiratory tract infection (17.8%), diarrhea (13.7%), influenza (15.1%), nasopharyngitis (16.4%), increased alanine aminotransferase (ALT; 12.3%); increased blood creatinine (12.3%), increased aspartate aminotransferase (11.0%) and back pain (11.0%); and for DFO, pyrexia (13.8%), upper abdominal pain (10.3%), increased platelet count (20.7%) and urticaria (10.3%). Serious AEs with suspected relationship to study drug were reported in 6.8% of DFX and 6.9% of DFO patients. A DFX patient died due to cardiac arrest which was not considered related to study drug. Serum creatinine increases >33% from BL and > upper limit of normal (ULN) at 2 consecutive values occurred in 2.7% of DFX and 3.4% of DFO patients. Frequency of ALT elevations >5 x ULN and 2 x BL were comparable between groups. Discussion Cardiac T2* increased substantially during 2-yr treatment with DFX or DFO. Improvement with DFX was comparable with DFO, although DFO patient numbers were low. The magnitude of cardiac T2* improvement with DFX was consistent with previous long-term studies (Pennell Blood 2010). Mean LVEF was stable and remained within normal limits in both groups. LIC continued to decrease from very high BL levels with DFX and DFO. The reduction in CIC in the extension was similar or possibly greater than in the core, which might relate to the falling LIC. Long-term safety profiles of DFX and DFO were consistent with previous reports. Disclosures: Pennell: Shire: Consultancy, Honoraria; ApoPharma: Consultancy, Honoraria, Research Funding; Novartis: Consultancy, Honoraria, Research Funding. Porter:Celgene: Consultancy; Shire: Consultancy, Honoraria; Novartis: Consultancy, Honoraria, Research Funding. Piga:Novartis: Membership on an entity’s Board of Directors or advisory committees, Research Funding. Wegener:Novartis: Employment. Habr:Novartis: Employment. Shen:Novartis: Employment. Aydinok:Shire: Membership on an entity’s Board of Directors or advisory committees, Research Funding; Novartis: Honoraria, Membership on an entity’s Board of Directors or advisory committees, Research Funding, Speakers Bureau.

Background Patients with myocardial iron overload require effective cardiac iron removal to minimize the risk of cardiac complications. The 3 year EPIC cardiac sub-study showed that the oral iron chelator, deferasirox (DFX), effectively reduced cardiac iron overload. Previous reports demonstrate that cardiac iron removal is slow and suggest that liver iron concentration (LIC) may affect cardiac iron removal rate by chelators (Pennell et al., 2012; Blood). The objective of these analyses was to evaluate the impact of the severity of the liver iron overload on the change in myocardial T2* (mT2*) for patients receiving up to 3 years of DFX treatment in the EPIC sub-study. Methods Inclusion and exclusion criteria have been described previously (Pennell et al., 2012; Haematologica). Patients were categorized into LIC ≤15 and >15 mg Fe/g dry weight (hereafter mg/g) at baseline (BL) and by LIC 15 mg/g at 12, 24, and 36 months to assess the impact of BL LIC and changes in LIC overtime on mT2*, respectively. During study, LIC and mT2* were measured every 6 months. Efficacy was assessed in per-protocol population that entered third year extension. Here, mT2* is presented as the geometric mean (Gmean) ± coefficient of variation (CV) unless otherwise specified. Statistical significance was established at α-level of 0.05 using a 2-sided paired t-test for within group comparisons and ANOVA for multiple group comparisons. All p-values were of exploratory nature for this post-hoc analysis. Results Of the 71 patients, who continued into study year 3, 68 patients considered evaluable were included in this analysis (per protocol population); 59 patients had LIC values available at end of study (EOS). Mean age was 20.5 ±7.35 years and 61.8 % of patients were female. Mean actual dose of DFX (mg/kg/day) was 32.1 ±5.5 and 35.1 ±4.9 in patients with BL LIC ≤15 and >15 mg/g, respectively. At EOS, mean actual doses were 32.9 ±5.4 (LIC 15 mg/g). Overall, patients had high BL LIC (Mean, 29.0 ±10.0 mg/g); 61 patients had LIC >15 (30.8 ±8.8) mg/g, only 7 patients had LIC ≤15 (12.7 ±1.1) mg/g, and no patients had LIC 15 mg/g, respectively. Notably, 51.9% of patients with BL LIC >15 mg/g achieved EOS LIC Overall, mean mT2* was 12.8 ±4.6 ms. The impact of BL LIC on mT2* and LIC response was as follows: in patients with LIC ≤15 mg/g (Mean BL mT2*, 14.2 ±3.6 ms) and >15 mg/g (BL mT2*, 12.7 ±4.7 ms), mT2* increased by 52% (Mean abs. change, 7.5 ±4.1 ms, p=0.0016) and 46% (7.3 ±7.3 ms, p15 mg/g, (20.1 ±10.6 ms) displaying a lag of nearly 12 months. The relation between post-BL LIC on mT2* response at 12, 24 and 36 months is shown in the figure. At 12 months, there was no significant difference in mT2* that had occurred in patients with LIC 15 mg/g (13% increase; 1.9 ±3.2 ms). However, at 24 months, there was a statistically significant difference amongst the 3 subgroups in percent increase in the mT2* that had occurred; patients with LIC 15 mg/g had 54% (Mean abs. change, 8.3 ±7.3 ms), 33% (5.2 ±5.2 ms) and 10% (2.1 ±4.3 ms) increase (p 15mg/g group. At all-time points, in patients who achieved an LIC Discussion Overall, DFX treatment resulted in a significant decrease in LIC and improved mT2*. A greater difference in mT2* improvement was shown to have occurred in patients who achieved lower end-of-year LIC after treated with DFX. This divergence was progressive with time, being maximal at 36 months. Thus, a therapeutic response in LIC with DFX is associated with a greater likelihood of improving mT2*. This may assist in monitoring liver and cardiac response to DFX. Prospective evaluation of this relationship is indicated. Disclosures: Porter: Novartis Pharma: Consultancy, Honoraria, Research Funding; Shire: Consultancy, Honoraria; Celgene: Consultancy. Taher:Novartis Pharma: Honoraria, Research Funding. Aydinok:Novartis Oncology: Honoraria, Membership on an entity’s Board of Directors or advisory committees, Research Funding, Speakers Bureau; Shire: Membership on an entity’s Board of Directors or advisory committees, Research Funding. Cappellini:Novartis Pharma: Honoraria, Speakers Bureau; Genzyme: Honoraria, Membership on an entity’s Board of Directors or advisory committees. Kattamis:Novartis: Research Funding, Speakers Bureau; ApoPharma: Speakers Bureau. El-Ali:Novartis Pharma: Employment. Martin:Novartis Pharma: Employment. Pennell:Novartis: Consultancy, Honoraria, Research Funding; ApoPharma: Consultancy, Honoraria, Research Funding; Shire: Consultancy, Honoraria.

Background Transfusion-dependent patients with severe cardiac siderosis often require intensive iron chelation therapy for a limited time to facilitate rapid removal of iron from the heart, allowing patients to move from a high-risk (cardiac T2* Aim To evaluate efficacy and safety of investigational DFX–DFO in combination followed by DFX monotherapy in patients with severe transfusional cardiac siderosis. Methods The prospective, Phase II, open-label, multinational HYPERION study evaluated DFX–DFO in combination followed by DFX monotherapy in transfusion-dependent patients with severe cardiac siderosis (NCT01254227). Patients enrolled were ≥10 years with CMR-measured cardiac T2* 5– Results 60 patients were enrolled (59 β-thalassemia major, 1 Diamond–Blackfan anemia; mean age 22.8 years; 46.7% male) with severe iron overload (geometric mean [Gmean] cardiac T2* 7.03 ms, mean LIC 33.4 ± 14.5 mg Fe/g dw, median serum ferritin 5551 ng/mL [range 1163, 11,317]). Overall, 20 patients discontinued; 5 consent withdrawals, 4 adverse events (AEs: pruritus, arthritis, abdominal pain, drug rash with eosinophilia and systemic symptoms), 4 abnormal test procedure results (all T2* 33% increase from BL and >upper limit of normal at 2 consecutive visits. Discussion Cardiac T2* improved during 12 months of treatment with DFX–DFO in patients with severe transfusional body iron burden. High BL LIC levels decreased considerably with DFX–DFO. Overall, as LIC decreased cardiac T2* increased, most notably after 6 months. The higher DFX dose permitted after Month 6 possibly influenced this trend. Cardiac T2* improvements were observed irrespective of BL LIC value, but were most marked in those with BL LIC Disclosures: Aydinok: Shire: Membership on an entity’s Board of Directors or advisory committees, Research Funding; Novartis: Honoraria, Membership on an entity’s Board of Directors or advisory committees, Research Funding, Speakers Bureau. Off Label Use: Deferasirox and deferoxamine are both indicated as a monotherapy for the treatment of chronic iron overload due to frequent blood transfusions. Patients with severe cardiac iron overload are at increased risk of heart failure and are often treated by off-label combination therapy for a limited time to facilitate rapid removal of iron from the heart, allowing patients to move to a lower-risk status. This abstract describes off-label use of the combination of deferasirox and deferoxamine to treat patients with severe transfusional cardiac iron overload. Kattamis:Novartis: Research Funding, Speakers Bureau; ApoPharma: Speakers Bureau. Cappellini:Genzyme: Honoraria; Novartis: Honoraria, Speakers Bureau. Perrotta:Novartis: Research Funding. Karakas:Novartis: Honoraria, Research Funding. Viprakasit:GPO, Thailand: Honoraria, Research Funding; Shire: Research Funding; Novartis: Consultancy, Honoraria, Membership on an entity’s Board of Directors or advisory committees, Research Funding, Speakers Bureau. Habr:Novartis: Employment. Wegener:Novartis: Employment. Shen:Novartis: Employment. Porter, MD on behalf of the HYPERION investigators:Shire: Consultancy, Honoraria; Celgene: Consultancy; Novartis: Consultancy, Honoraria, Research Funding.

Abstract 1028 Background: To prevent complications associated with iron overload in patients with transfusion-dependent anemias, iron chelation therapy is required throughout life starting from early childhood. Long-term studies of iron chelation therapy are therefore required, particularly in pediatric patients. The 1-year open-label, single-arm, multicenter EPIC (Evaluation of Patients' Iron Chelation with Exjade®) trial evaluating the efficacy and safety of deferasirox in patients with transfusion-dependent iron overload enrolled 577 pediatric patients across 23 countries. In an extension period of up to 18 months, or until deferasirox was available locally, patients completing the core study could continue to receive deferasirox, thus providing long-term efficacy and safety data of deferasirox in iron-overloaded pediatric patients. Methods: At enrolment, transfusion-dependent pediatric patients (defined as ≥2–20 transfusions or >100 mL/kg red blood cells transfused) and liver iron concentration >2 mg Fe/g dw confirmed by R2 magnetic resonance imaging. Deferasirox starting dose was 10–30 mg/kg/day depending on frequency of blood transfusions, with protocol-specified adjustments of 5–10 mg/kg/day (range 0–40 mg/kg/day) based on 3-monthly serum ferritin trends and safety. Biochemistry analysis including serum ferritin was performed on a monthly basis, and growth was monitored every 12 weeks, with continuous assessment of safety parameters. Creatinine clearance was calculated using the Schwarz formula for pediatric patients. Changes from the start of deferasirox treatment (core baseline) are presented. Results: 267 pediatric patients aged 2– Overall, 257/267 (96.3%) patients completed the extension; main reasons (more than two patients) for discontinuation were unsatisfactory therapeutic effect (n=4, 1.5%) and consent withdrawal (n=3; 1.1%). The most common (>5%) investigator-assessed drug-related AEs were increased alanine aminotransferase (ALT; n=47, 17.6%), increased aspartate aminotransferase (AST; n=44, 16.5%), increased blood creatinine (n=24, 9.0%) and rash (n=23, 8.6%). ALT and AST increases were mostly mild in severity, transient, non-progressive and managed with dose adjustments. There were no reported drug-related serious AEs and no deaths occurred. 45/267 (16.9%) patients had two consecutive ALT values >5 × upper limit of normal (ULN). Of these 45 patients, 40 had high ALT levels at baseline and 30 had ALT or AST >2.5 × ULN at baseline; 13/45 had a history of hepatitis B and/or C. 6/267 (2.2%) patients had two consecutive serum creatinine values >33% above baseline and >ULN; all had normal values at baseline. The relative change in creatinine clearance from baseline to end of the extension was between –10 and –20% for the majority of patients (n=52, 19.5%), although changes in both directions were variable. Stature, growth and weight assessments indicated positive growth velocity. For all patients combined, mean ± SD growth velocity at end of extension was 5.9 ± 43.3 cm/year (median 2.6 cm/year). Conclusions: Deferasirox therapy for up to 3 years in pediatric patients significantly decreased serum ferritin, similar to previous reports. The majority of patients with elevated liver enzymes during the study also had elevated levels at baseline; renal safety was consistent with previous reports. While patient age and gender will influence individual growth rates, positive growth velocity was nonetheless maintained during treatment. Disclosures: Lin: Novartis: Honoraria. Aydinok:Novartis: Honoraria, Research Funding, Speakers Bureau; Ferrokin: Research Funding. Galanello:Novartis: Research Funding, Speakers Bureau; Apopharma: Research Funding, Speakers Bureau; Ferrokin: Research Funding. El-Ali:Novartis: Employment. Martin:Novartis: Employment. Cappellini:Novartis: Speakers Bureau.

Abstract 690 BACKGROUND: The iron chelators in current clinical use - deferoxamine, deferasirox, deferiprone - are useful for many but not all patients with transfusion-dependent anemias. FBS0701 is a novel, orally available tridentate iron chelator in clinical development. Pre-clinical studies demonstrated a >4-fold higher no-observable-adverse-effect level compared to deferasirox (Exjade®) suggesting a favorable clinical safety profile, especially with respect to gastrointestinal and renal toxicity. Multi-dose safety and PK studies in transfusional iron-overloaded patients established the acute safety of FBS0701 and support once-a-day dosing. OBJECTIVES: To assess the long term safety, tolerability, dose-response and pharmacodynamics of FBS0701 in adults with transfusional iron overload. METHODS: This was a 24 week, multi-center study of FBS0701 at two once-daily dose levels: 14.5 (16 mg of the salt form) and 29 (32 mg salt) mg/kg/d. These doses are the molar equivalent of 13.5 and 27 mg/kg of deferasirox. Adults under age 60 y, with liver iron concentration (LIC) measured by R2 (Ferriscan®) MRI at baseline between 3.5 and 30 mg/g dry weight and cardiac T2* >10 ms were eligible for enrolment. Fifty-one patients were stratified on the basis of historical mean daily transfusion iron intake and then randomized to dose. Patients were evaluated at Weeks 1, 2, 3, 4, 6, 8 and then monthly to 24 wks. Assessments included history and physical exam, vital signs, clinical pathology, adverse events (AEs), ECG and LIC by R2 MRI at baseline, 12 and 24 weeks. All results shown are from the safety population (patients who received at least one dose FBS0701) RESULTS: All patients had a primary hemoglobinopathy, the majority (75%) with β-thalassemia syndromes. Twenty-four (47%) patients had abnormal transaminases prior to dosing and 16 patients (31%) had a history of viral hepatitis. FBS0701 was generally well tolerated at both doses. Forty-nine patients (96%) completed the study; two withdrew for reasons unrelated to drug. There were no serious AEs related to FBS0701. No AEs showed dose-dependency in frequency or severity. Fewer than 5% had nausea, vomiting, abdominal pain, or diarrhea deemed related to FBS0701. The most common AE deemed related to FBS0701 was an increase in transaminases (15%, N=8). Three of these patients acquired HCV on-study from a single blood bank source. None of the remaining patients exceeded their baseline transaminases by 5X. Mean serum creatinine (Cr) in the two dose groups were not statistically different from each other or from baseline values (Figure 1). Only three (5%) patients, each with GFR CONCLUSIONS: FBS0701 for 24 weeks was equally well tolerated at both doses: AEs related to drug were each Disclosures: Neufeld: Ferrokin BioSciences: Research Funding; Novartis: Research Funding. Galanello:Apopharma: Research Funding, Speakers Bureau; Novartis: Research Funding, Speakers Bureau; Ferrokin Biosciences: Research Funding. Viprakasit:Ferrokin BioSciences: Research Funding; Novartis: Research Funding, Speakers Bureau; GPO-L-ONE: Research Funding; National Research University, Thailand: Research Funding. Aydinok:Ferrokin Biosciences: Research Funding; Novartis: Honoraria, Research Funding, Speakers Bureau. Piga:Ferrokin BioSciences: Research Funding. Harmatz:Novartis: Research Funding. Forni:Ferrokin BioSciences: Research Funding; Fondazione Carige, Genoa, IT: Research Funding; Novartis: Research Funding, Speakers Bureau. Shah:Swedish Orphan Biovitrum: Speakers Bureau; Novartis: Speakers Bureau; Ferrokin Biosciences: Research Funding. Grace:Ferrokin BioSciences: Research Funding. Porter:Ferrokin BioSciences: Research Funding. Vichinsky:Apopharma: Research Funding; Ferrokin Biosciences: Research Funding; Novartis: Research Funding. Wood:ApoPharma: Consultancy; Novar: Research Funding; Ferrok: Consultancy. Peppe:Ferrokin BioSciences: Employment. Jones:Ferrokin BioSciences: Employment. Rienhoff:Ferrokin BioSciences: Employment, Equity Ownership.

Abstract 5158 Objectives. Classic clinical and animal studies with deferoxamine (DFO) showed that two major chelatable pools exist in thalassemia major (TM), the first derived from hepatocytes and the second from red cell catabolism. Knowledge about the origin of chelatable iron with deferiprone (DFP) treatment, alone or when combined with DFO, is relatively limited. We hypothesized that changes in plasma iron species during chelation therapy may be proportional to the magnitude of chelatable iron pools. In this study, we have examined the relationship between urinary iron excretion (UIE), transfusional iron loading rates (ILR), liver iron concentration (LIC) and plasma concentrations of non-transferrin bound iron (NTBI) and labile plasma iron (LPI) before and after DFP therapies. Patients and methods. 12 TM patients were randomized to one year of DFP monotherapy (25mg/kg tds) or 9 to DFP at the same dose with the addition of subcutaneous DFO (40-50mg/kg), 2 nights a week (COMB). Plasma samples were taken for NTBI and LPI measurements, at baseline, at 1 week and at 52 weeks. These were obtained at 9am, which was 10hrs following the previous DFP dose, and 24h after the second of two weekly DFO doses for COMB patients. A 24h urine iron was collected at baseline, 1 week and 52 weeks of treatment. The ILR, expressed in mg/kg/day, was calculated from the blood volume transfused during the 1 year study. Results. After 1 week of treatment, there was a significant increase in NTBI from baseline in DFP and in COMB patients. A significant increase in LPI was also seen in DFP patients at this time (p=0.039). In all patients, absolute LPI levels at 1 week correlated with those of NTBI and increments in LPI also correlated with increments in NTBI from baseline to 1 week (r=0.52, p=0.002). Plasma NTBI levels at 1 week were proportional to UIE mg/kg/day)(r=0.51, p= 0.02), to LIC mg/g dry wt (r=0.54, p=0.01) and inversely proportional to the ILR (r=0.74, p=0.0001). By weighting the LIC and ILR pools equally, a combined chelatable pool index was derived: this was significantly proportional to both absolute NTBI at 1 week (r=0.72, p=0.003) and increments in NTBI from baseline. This index was also significantly correlated with UIE (p=0.66, p=0.0017) and with LPI at 1 week. Interpretation and conclusions. Urinary iron excretion with DFP (the predominant route of iron excretion with DFP) and COMB therapy is directly proportional to the LIC, as well as to plasma NTBI and LPI and is inversely proportional to the ILR. This is consistent with the existence of two major chelatable iron pools; the first being liver derived and the second derived from red cell catabolism. This latter pool appears to be larger for those patients who require less blood transfusion and who presumably have greater rates of ineffective eryrthropoiesis. The origin of chelatable iron with this form of COMB therapy, with DFO only two days a week, appears is similar to that of DFP monotherapy. Disclosures: Aydinok: Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Off Label Use: Deferiprone and desferrioxamine are indicated and approved for the chelation therapy of iron-overloaded patients with beta thalassemia. The combination of both agents as treatment regimen for patients with beta thalassemia is part of the investigation described in the abstract and is not approved for use. Manz:Lipomed AG: Employment. Porter:Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau.

Abstract 4276 Background: To date, the efficacy of various iron chelators in reducing cardiac iron, a leading cause of death in transfused patients with β-thalassemia major (TM), has been demonstrated in prospective controlled studies of up to 1-yr duration. Since removal of iron from the heart takes several years, it is important to assess longer-term effects of iron chelation therapy in terms of cardiac iron removal. We report here end-of-study (EOS) results from the EPIC cardiac substudy in TM patients treated with deferasirox for up to 3 yrs. Methods: Patients aged ≥10 yrs with myocardial T2* >5 to 2500 ng/mL, MR (R2) liver iron concentration (LIC) >10 mg Fe/g dry weight (dw) and ≥50 lifetime transfused blood units were included in the study. Deferasirox was initiated at 30 mg/kg/day and increased to 40 mg/kg/day by the start of yr 2. Dose decreases were allowed for safety reasons. Primary endpoint was change in myocardial T2* from baseline (BL) to 3 yrs. Results: Seventy-one patients completed 2 yrs of treatment and entered the 3rd yr of the study. Mean age was 20.5 ± 7.4 yrs. BL cardiac T2* was >5 to 5 to After 3 yrs, 68.1% of patients with BL T2* 10 to 5 to Of 71 patients, 66 (93.0%) completed the 3rd yr. Reasons for discontinuation were unsatisfactory therapeutic effect (n=3) and consent withdrawal (n=2). There were no deaths during the 3-yr study. Drug-related AEs (≥5%) decreased year by year: increased blood creatinine (n=19 [26.8%] vs n=16 [22.5%] vs n=9 [12.7%]), rash (n=11 [15.5%] vs n=0 vs n=0), increased ALT (n=5 [7.0%] vs n=3 [4.2%] vs n=2 [2.8%]), increased AST (n=4 [5.6%] vs n=3 [4.2%] vs n=1 [1.4%]) and diarrhea (n=4 [5.6%] vs n=1 [1.4%] vs n=0). In yr 3, serious AEs included atrial fibrillation, chronic sinusitis, femur fracture, gastritis, muscle abscess and rheumatic fever (all n=1); none were considered deferasirox-related. Six patients (8.5%) had 2 consecutive increases in serum creatinine >33% above BL and upper limit of normal (ULN); 3 patients in the 1st yr and 3 in the 3rd yr. Two (2.8%) patients had 2 consecutive increases in ALT >10 × ULN; 1 patient in the 2nd yr and 1 patient in both the 2nd and 3rd yr. Conclusion: This is the first prospective study to report 3-yr data on cardiac iron removal for an iron chelator. Once-daily deferasirox monotherapy at doses of 30–40 mg/kg/day effectively removed cardiac iron, allowing 68% of patients with moderate-to-mild cardiac iron loading to normalize and 50% of patients with severe myocardial iron loading at BL to reduce their cardiac iron levels to the moderate-to-mild range, associated with a much lower risk of heart failure. Importantly, there were no reports of death during the study. The long-term improvements in cardiac iron loading with deferasirox at doses of >30 mg/kg/day were associated with a manageable safety profile, maintenance of normal cardiac function and a concomitant significant decrease in hepatic and total body iron burden by nearly 50% over the 3 yrs. Disclosures: Pennell: Siemens: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Apotex: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Novartis: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; CVIS: Equity Ownership. Porter:Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Cappellini:Novartis: Speakers Bureau. Aydinok:Novartis: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Ibrahim:Novartis: Honoraria. Li:Novartis: Honoraria, Membership on an entity's Board of Directors or advisory committees. Viprakasit:Novartis: Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau. Kattamis:Novartis: Honoraria, Research Funding, Speakers Bureau. Smith:Novartis: Consultancy, Research Funding. Habr:Novartis: Employment. Domokos:Novartis: Employment. Roubert:Novartis: Employment. Taher:Novartis: Honoraria, Research Funding.

Abstract 4062 Poster Board III-997 Background Over 70% of deaths in regularly transfused patients with β-thalassemia major (TM) are related to iron-induced cardiomyopathy. Deferasirox (Exjade®), in a sub-study of the 1-year multicenter prospective EPIC trial, demonstrated efficacy in reducing myocardial iron in TM patients with mild, moderate and severe cardiac siderosis, as evidenced by a statistically significant improvement in myocardial T2*. We herein report the extension phase results from the same study in patients who have received up to 2 years of deferasirox therapy. Methods Patients aged ≥10 years with myocardial T2* >5–2500 ng/mL, MR (R2) LIC >10 mg Fe/g dry weight (dw), and a lifetime minimum of 50 transfused blood units were included in the cardiac sub-study. Deferasirox was initiated at 30 mg/kg/day and increased to 40 mg/kg/day by the time patients had entered the 1-year extension. Dose decreases were allowed for safety reasons. The primary endpoint was change in myocardial T2* from baseline to 2 years. Results Out of 100 patients who entered the 1-year extension phase, 85 completed (85%); 24-month CMR data are available for 81 patients. Mean age was 20.6 ±7.3 years. Baseline cardiac T2* was Reasons for discontinuation were: unsatisfactory therapeutic effect (n=8), consent withdrawal (n=3), protocol violation (n=2), lost to follow up (n=1) and abnormal laboratory value (increased urinary protein/creatinine ratio) leading to consent withdrawal (n=1); no deaths were reported. Incidence of investigator-assessed drug-related AEs (≥5%) decreased overall from the core phase to the extension: increased blood creatinine (n=21 [21.0%] vs n=18 [18.0%]), rash (n=15 [15.0%] vs n=0), increased alanine aminotransferase (ALT) (n=6 [6.0%] vs n=4 [4.0%]) and increased aspartate aminotransferase (n=4 [4.0%] vs n=3 [3.0%]). There were no drug-related serious AEs over 2 years. In total, 4 patients (4.0%) had increased serum creatinine >33% above baseline and the upper limit of normal (ULN) on two consecutive visits; 3 patients (3.0%) during the core and 1 (1.0%) during the extension. 4 (4.0%) patients had increased ALT >10xULN on two consecutive visits; 2 patients (2.0%) during the core and 2 (2.0%) during the extension; levels were already >ULN at baseline in these patients. Conclusions This is the first large prospective study to report 2-year data on cardiac iron removal for any iron chelator. Results show that continued therapy with deferasirox for up to 2 years at doses 30–40 mg/kg/day was effective in removing iron from the heart in TM patients with mild, moderate and severe cardiac siderosis. Myocardial T2* continued to improve in year 2 and the statistically significant improvement from baseline was associated with maintenance of normal cardiac function and a concomitant decrease in hepatic and total body iron burden. Overall, deferasirox was well tolerated. Disclosures: Pennell: Novartis: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding; Apopharma: Consultancy, Honoraria; Cardiovascular Imaging Solutions: Equity Ownership; Siemens: Research Funding. Off Label Use: THE SPECIFIC USE OF CHELATION FOR CARDIAC SIDEROSIS IS OFF-LABEL. Porter:Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Vifor International: Membership on an entity's Board of Directors or advisory committees. Cappellini:Novartis: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Genzyme: Membership on an entity's Board of Directors or advisory committees. Chan:Novartis: Honoraria, Research Funding. Aydinok:Novartis: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Ibrahim:Novartis: Research Funding. Li:Novartis: Consultancy, Speakers Bureau. Viprakasit:Thai Government : Employment; Novartis: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Government Pharmaceutical Organization of Thailand: Honoraria, Research Funding. Kattamis:Novartis: Consultancy, Honoraria, Speakers Bureau. Smith:Novartis Pharma AG: Consultancy, Employment at Royal Brompton Hospital funded by Novartis Pharma AG. Habr:Novartis Pharmaceuticals: Employment. Domokos:Novartis Pharma AG: Employment. Roubert:Novartis Pharma AG: Employment. Taher:Novartis: Honoraria, Research Funding.

Abstract 4063 Poster Board III-998 Background In a large, 1-yr Phase 3 clinical trial, patients (pts) with β-thalassemia (aged ≥2 yrs) were randomized to receive deferasirox (Exjade®) or deferoxamine (DFO), with doses assigned according to baseline liver iron concentration (LIC). Pts completing the 1-yr core were permitted to enter a 4-yr extension; those receiving deferasirox continued on this therapy (deferasirox cohort), while those receiving DFO crossed over to deferasirox (crossover cohort). This analysis evaluates the efficacy and safety of deferasirox over 5 yrs. Methods Based on analyses showing that iron burden and transfusional iron intake need to be considered for appropriate dosing of deferasirox, dose adjustments were permitted in the extension to ensure optimal dosing. Deferasirox dose in the extension was initially based on dose response in the core (deferasirox cohort only) and end-of-core LIC (biopsy or SQUID); subsequent adjustments in steps of 5–10 mg/kg/day were based on serum ferritin (SF) levels and safety markers. Efficacy was assessed by monthly SF levels and LIC at baseline, end of 1-year core and end of study (EOS) (or upon discontinuation). Safety was assessed by incidence and type of adverse events (AEs) and changes in laboratory parameters. Results 296 pts (deferasirox cohort) and 259 pts (crossover cohort) received ≥1 dose of deferasirox; 181 (61%) & 190 (73%) pts from each cohort respectively completed the extension. Most common reasons for discontinuation: consent withdrawal (n=62) and AEs (n=43). Most common AEs leading to discontinuation: increased ALT [n=5], increased transaminases [n=4], glycosuria [n=4]. 2 deaths occurred during the extension in the deferasirox cohort (cardiac failure, cardiomyopathy); 2 in the crossover cohort (cardio-respiratory arrest, road traffic accident); none considered to be related to study drug. Median duration of deferasirox treatment was 61.2 & 48.1 mths in deferasirox & crossover cohorts, respectively. At start of deferasirox, mean LIC was 14.0 ± 9.8 & 10.4 ± 7.6 mg Fe/g dry weight (dw) and median SF was 2211 & 1758 ng/mL in deferasirox and crossover cohorts, respectively. Transfusion requirements at start of deferasirox were comparable; most pts (81% & 83%, respectively) receiving 7–14 mL/kg/mth. Mean deferasirox dose during study: 21.6 ± 6.4 & 23.2 ± 5.9 mg/kg/d (final actual dose: 24.4 ± 8.7 & 27.0 ± 8.0 mg/kg/d) in deferasirox and crossover groups, respectively. Most pts were receiving 15– Most common drug-related AEs (≥5% overall) after start of deferasirox in deferasirox & crossover cohort, respectively: increased blood creatinine (n=42, 14%; n=20, 8%), nausea (n=28, 10%; n=13, 5%), vomiting (n=18, 6%; n=17, 7%), diarrhea (n=13, 4%; n=15, 6%) & rash (n=17, 6%; n=19, 7%). Frequency of drug-related AEs decreased from year to year. In deferasirox & crossover cohorts, 26 (9%) & 11 (4%) pts had 2 consecutive serum creatinine increases >33% above baseline & upper limit of normal (ULN) & 3 (1%) & 2 (1%) pts had ALT >10 x ULN on 2 consecutive visits, respectively, after start of deferasirox. Conclusions Long-term treatment with deferasirox (for up to 5 yrs) significantly decreased iron burden in β-thalassemia pts aged ≥2 yrs with an increasing percentage of pts achieving therapeutic goals of LIC Disclosures: Cappellini: Novartis: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Genzyme: Membership on an entity's Board of Directors or advisory committees. Perrotta:Novartis: Consultancy, Research Funding. Aydinok:Novartis: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Porter:Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Vifor International: Membership on an entity's Board of Directors or advisory committees. Piga:Novartis: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Apopharma: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding. Griffel:Novartis Pharmaceuticals: Employment, Equity Ownership. Lagrone:Novartis Pharmaceuticals: Employment. Clark:Novartis Pharma AG: Employment. Kattamis:Novartis: Consultancy, Honoraria, Speakers Bureau.

Abstract 5106 Background Heart failure secondary to myocardial siderosis remains the main cause of death in regularly transfused patients with β-thalassemia. Once-daily oral iron chelation therapy with deferasirox (Exjade®) has been shown to reduce body iron burden in patients with transfusion-dependent anemias, and the removal of myocardial iron has been demonstrated in several clinical studies including the prospective, multicenter EPIC study. Here we report for the first time an evaluation of right ventricular (RV) function assessed using magnetic resonance (MR) techniques in β-thalassemia patients with myocardial siderosis treated with deferasirox in the EPIC study. Methods The cardiac sub-study of EPIC enrolled patients with β-thalassemia aged ≥10 yrs who had MR myocardial T2* >5–2500 ng/mL, MR (R2) liver iron concentration (LIC) of >10 mg Fe/g dry weight (dw), and a lifetime minimum of 50 transfused blood units. Deferasirox was initiated at 30 mg/kg/day and subsequent dose adjustments of 5–10 mg/kg/day were based on changes in SF, month-6 cardiac T2* and safety parameters. The following RV parameters were assessed using MR; ejection fraction (RVEF), volumes (end-systolic [RVESV] and end-diastolic [RVEDV]) and mass (RVM). All parameters were assessed at the CMR core laboratory in London, UK after 6 and 12 months of deferasirox treatment. Results 114 patients were enrolled in the cardiac sub-study (54 male, 60 female; mean age 20.9 ± 7.3 years). Baseline myocardial T2* was Conclusions To our knowledge, this is the first study to show a change in RV volumes and improvement in RV function associated with iron chelation. The RVEF improved with increased RVEDV and decreased RVESV, which is suggestive of improved RV and left ventricular compliance respectively resulting from removal of myocardial iron. However, improvements in pulmonary vascular resistance may also play a role. Disclosures Smith: Novartis Pharma AG: Consultancy, Employment at Royal Brompton Hospital funded by Novartis Pharma AG. Pennell:Novartis: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding; Apopharma: Consultancy, Honoraria; Cardiovascular Imaging Solutions: Equity Ownership; Siemens: Research Funding. Off Label Use: THE SPECIFIC USE OF CHELATION FOR CARDIAC SIDEROSIS IS OFF-LABEL. Porter:Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Vifor International: Membership on an entity's Board of Directors or advisory committees. Cappellini:Novartis: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Genzyme: Membership on an entity's Board of Directors or advisory committees. Chan:Novartis: Honoraria, Research Funding. Aydinok:Novartis: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Ibrahim:Novartis: Research Funding. Lee:Novartis: Consultancy, Speakers Bureau. Viprakasit:Thai Government: Employment; Novartis: Honoraria, Research Funding; GPO-L-ONE clinical study sponsor by Government Pharmaceutical Organization of Thailand: Honoraria, Research Funding. Kattamis:Novartis: Consultancy, Honoraria, Speakers Bureau. Habr:Novartis Pharmaceuticals: Employment. Domokos:Novartis Pharma AG: Employment. Hmissi:Novartis Pharma AG: Employment. Taher:Novartis: Honoraria, Research Funding.

Background: Myocardial siderosis is a leading cause of cardiac morbidity in patients (pts) with β-thalassemia undergoing regular blood transfusion therapy. Myocardial and liver siderosis do not correlate in cross-sectional studies, hence the importance of monitoring both cardiac and liver iron in heavily transfused β-thalassemia pts. Iron chelation therapy has an important role in preventing the accumulation of cardiac iron. Deferasirox (Exjade®) is a once-daily, oral iron chelator with efficacy in removing cardiac iron in preclinical and small clinical studies. This subgroup analysis from the cardiac substudy of the EPIC trial, the largest prospective, multicenter clinical trial evaluating the effects of iron chelation therapy, assesses the longitudinal effect of deferasirox over 1 year in preventing myocardial siderosis (maintaining T2* values >20 ms) in non-cardiac iron overloaded pts with β-thalassemia and normal cardiac function. Methods: Pts with β-thalassemia (≥10 years) and with normal myocardial iron levels (magnetic resonance [MR] myocardial T2* of ≥20ms) were included in the prevention arm of the cardiac substudy. Other inclusion criteria were: serum ferritin (SF) >2500 ng/mL; MR (R2) liver iron concentration (LIC) >10 mg Fe/g dry weight (dw); left ventricular ejection fraction (LVEF) ≥56%; and a lifetime minimum of 50 previous packed red blood cell transfusions. Deferasirox was initiated at 30 mg/kg/day with subsequent dose adjustments of 5–10 mg/kg/day based on changes in SF, month-6 myocardial T2*, and safety parameters. Change from baseline in myocardial iron at 1 year was the primary endpoint. Changes in cardiac function, SF and LIC were also evaluated. Results: We enrolled 78 pts into the cardiac prevention arm (35 male and 43 female; mean age, 20.2±7.5 years). The geometric mean (± coefficient of variation) myocardial T2* was 32.0 ms ±25.6%. Mean baseline (±SD) LVEF was 67.7±4.7%, LIC 28.8±10.2 mg Fe/g dw, and median SF 4712 ng/mL. Transfusion requirements were 133.7 mL/kg in the year prior to enrollment. Previous chelation therapy had been received by 76 pts (deferoxamine [DFO], 69.2%; combination DFO/deferiprone, 28.2%). Mean deferasirox dose over 1 year was 27.6±6.0 mg/kg/day. After 12 months of therapy, the geometric mean myocardial T2* was 32.5 ms ±25.1% (ratio of geometric mean = 1.02; P=ns) and LVEF increased to 69.6% (P20 ms at baseline had a value below 20 ms at 12 mths. Median SF was significantly reduced from baseline at 12 months by 1048 ng/mL (P33% above baseline and the upper limit of normal (ULN) on two consecutive visits; there were no progressive increases. No pts had an increase in alanine aminotransferase >10×ULN on two consecutive visits. No pts died and no drug-related serious AEs were reported in this cohort. Conclusions: In β-thalassemia pts with normal myocardial iron levels at baseline, deferasirox treatment over 1 year maintained myocardial iron levels whilst significantly reducing body iron burden measured by SF and LIC. LVEF increased significantly. Deferasirox was well tolerated with a clinically manageable safety profile.

Background: Assessing the long-term efficacy and safety of iron chelation therapy is important given that patients with β-thalassemia require lifelong treatment. The efficacy and safety of deferasirox (Exjade®), a once-daily, oral iron chelator was established in patients with β-thalassemia in four 1-year core trials. Initial doses were assigned by baseline liver iron concentration and a clear dose response was observed. Subsequent data highlighted that a number of factors need to be considered when adjusting deferasirox dose, including iron burden and transfusional iron intake. Dose adjustments were permitted in the extension phases to the 1-year core trials, to ensure that optimal dosing was achievable. This analysis evaluates efficacy and safety during up to 4.5 years of deferasirox treatment in adult and pediatric patients with β-thalassemia. Methods: Following 1 year’s treatment with deferasirox in the four core studies, iron overloaded patients with β-thalassemia were enrolled in 4-year extension trials (105E–108E) evaluating the long-term efficacy and safety of deferasirox. Deferasirox doses in the extension trials were initially based on end-of-core liver iron concentration (LIC) and were subsequently adjusted according to serum ferritin (SF) levels. Efficacy was monitored by monthly SF levels; safety was assessed by the incidence and type of adverse events (AEs) and changes in laboratory parameters. Results: In total, 472 patients with β-thalassemia are included in this analysis. Patients received deferasirox for a median period of 55 months (4.6 years) at an overall mean ± SD daily dose of 22.1 ± 6.4 mg/kg. Mean iron intake over the entire treatment period was 0.4 ± 0.1 mg/kg/day. Median SF was 2319 ng/mL at baseline; change from baseline in SF was 158 ng/mL at 12 months, during which time the mean daily dose was ~19.5 mg/kg/day. Following 1-year’s treatment, dose adjustments were permitted and by 54 months (4.5 years) median SF had decreased significantly from baseline by 931 ng/mL (P Figure 1. Mean dose and median serum ferritin during deferasirox treatment Figure 1. Mean dose and median serum ferritin during deferasirox treatment Over the treatment period, 159 patients discontinued because of: consent withdrawal due mainly to the commercial availability of deferasirox (n=52, 11.0%), AEs (n=50, 10.6%), unsatisfactory therapeutic effect (n=39, 8.3%), and other reasons (n=13, 2.8%). Five deaths occurred (one in the core and four in the extension phases), all of which were considered by the Program Safety Board as unrelated to deferasirox. Overall, the most common drug-related (investigator-assessed) AEs were abdominal pain (n=62, 13.1%), nausea (n=55, 11.7%), diarrhea (n=40, 8.5%), vomiting (n=32, 6.8%) and rash (n=23, 4.9%); the annual frequency of these AEs decreased from year to year, ranging from 0–2.3% in years 2 to 5. The types of drug-related AEs in the extension trials were similar in nature to those in the core trials. The most common drug-related AEs that led to discontinuation were increased transaminases (n=7), glycosuria and proteinuria (n=3 for both). Thirty-four patients (7.2%) had an increase in serum creatinine >33% above baseline and the upper limit of normal (ULN) on two consecutive visits; there were no progressive increases or increase in the annual frequency from year to year. Twenty-nine (6.1%) patients had an increase in alanine aminotransferase >10 × ULN on at least one visit; baseline levels were already >ULN in 18 patients. Conclusions: Over 4.5 years’ treatment, deferasirox provided a dose-dependent reduction in SF in patients with β-thalassemia. Deferasirox was generally well tolerated with the frequency of investigator-reported AEs decreasing over long-term treatment. There were no changes in liver or renal function that differed significantly from the 1-year core trials and there was no evidence of progressive liver/renal dysfunction.

Background: As pediatric patients with β-thalassemia will require lifelong iron chelation therapy, it is important to evaluate the long-term efficacy, safety and growth during treatment with any iron chelator. This analysis presents cumulative efficacy and safety data from a cohort of pediatric patients treated with the once-daily, oral chelator deferasirox during two 1-year core and 4-year extension trials. Methods: β-thalassemia patients aged 2– Results: 168 patients (153 patients from study 107 and 15 from study 108) aged 2– At the time of analysis 137 patients (81.5%) continue to receive deferasirox. Of 31 discontinuations, 13 (7.7%) were due to AEs (drug-related AEs leading to discontinuation included glycosuria [n=3] and proteinuria [n=2]), eight (4.8%) to unsatisfactory therapeutic effect, five (3.0%) to consent withdrawal and four (2.4%) to other reasons. One death (septicemia in a splenectomized patient) occurred, considered by the Program Safety Board unrelated to treatment. Over the study period, the most common drug-related (investigator-assessed) AEs were abdominal pain and vomiting (n=12, 7.1% for both), nausea (n=10, 6.0%) and rash (n=9, 5.4%). The annual frequency of drug-related AEs decreased from year to year. In total, 13 patients (7.7%) had an increase in serum creatinine >33% above baseline and the upper limit of normal (ULN) on two consecutive visits; however, there were no progressive increases. Six patients (3.6%) with a normal baseline alanine aminotransferase (ALT), and five (3.0%) with a baseline ALT >ULN had an ALT increase >10×ULN on at least one visit. Growth, as assessed by height, proceeded normally in this population. Conclusions: Over a median period of 4.7 years, deferasirox treatment provided a dose-dependent overall reduction in iron burden in transfusion-dependent children with β-thalassemia, as measured by SF levels. Deferasirox was generally well tolerated with the frequency of investigator-reported AEs decreasing over long-term treatment. Figure 1. Mean dose and median change in SF during deferasirox treatment in pediatric β-thalassemia patients Figure 1. Mean dose and median change in SF during deferasirox treatment in pediatric β-thalassemia patients

Background: Heart failure secondary to myocardial siderosis remains the main cause of death in regularly transfused patients (pts) with β-thalassemia, hence the importance of using a chelator that can reduce cardiac iron. Deferasirox (Exjade®), a once-daily, oral iron chelator, has demonstrated removal of cardiac iron in preclinical and small clinical studies. The EPIC trial is a 1-yr, multicenter prospective longitudinal study, and is the largest of its kind for any chelation therapy. Here we report the EPIC cardiac sub-study, which evaluates the cardiac efficacy of deferasirox in β-thalassemia pts with myocardial siderosis. Methods: The sub-study of EPIC included pts with β-thalassemia aged ≥10 yrs who were eligible for enrollment in the core trial and who had magnetic resonance (MR) myocardial T2* >5–2500 ng/mL, MR (R2) liver iron concentration (LIC) >10 mg Fe/g dw, and a lifetime minimum of 50 transfused blood units. Deferasirox was initiated at 30 mg/kg/d and subsequent dose adjustments of 5–10 mg/kg/d were based on changes in SF, month-6 cardiac T2* and safety parameters. The primary endpoint was the change in myocardial T2* from baseline to 1 yr. Secondary endpoints included change in LVEF, SF and LIC at 1 yr. Results: Enrolled into this sub-study were 114 pts (54 M, 60 F; mean 20.9±7.3 yrs), of whom the baseline myocardial T2* was 4% increase) was seen in 69.5%; no change in 14.3%; and worsening (>4% decrease) in 16.2%. LVEF remained stable throughout the study: 67.4±5.7% to 67.1±6.0% (P=ns). Overall both mean LIC and median SF were reduced significantly from baseline by −6.6±9.9 mg Fe/g dw and −1257 ng/mL (P33% above baseline and the upper limit of normal (ULN) on two consecutive visits; there were no progressive increases. Two (1.8%) pts had an increase in alanine aminotransferase >10×ULN on two consecutive visits; levels were already elevated in these pts. Conclusions: In β-thalassemia pts with myocardial siderosis, deferasirox at a mean dose of 32.6 mg/kg/d over 1 yr removes iron from the heart. The statistically significant improvement in myocardial T2* was associated with maintained ejection fraction. Concomitantly, a significant decrease in hepatic and total body iron burden was also seen. Deferasirox treatment was generally well tolerated. Ongoing one-yr extension of this sub-study will elucidate further the cardiac efficacy of deferasirox.

Several clinical studies have shown that the combination of deferiprone (DFP) with desferrioxamine (DFO) is efficacious with regard to decrease in serum ferritin (SF), reduction of liver iron concentration (LIC) and increase in urinary iron excretion (UIE) in patients (pts) suffering from thalassemia major (TM). However, there is lack of randomized controlled trials comparing the efficiacy and safety of the combination therapy versus DFP or DFO monotherapy. This is the first randomized controlled trial analyzing and comparing changes of LIC and total iron excretion (TIE) in pts treated with the combination therapy versus pts treated with DFP or DFO monotherapy during a study period of one year. A total of 95 pts with TM were randomized into one of the following three treatment arms: DFP was given orally at a daily dose of 75 mg/kg either alone, in combination with s.c. DFO (40–50 mg/kg twice weekly) or DFO was given alone at a dose of 40–50 mg/kg 5 days a week (control arm). All pts had been treated with DFO prior to the study. LIC was measured in biopsies at baseline and after one year. TIE / day was calculated as (iron transfused during study period (mg) + (LIC at T0 - LIC at T1y) x 10.6 x body weight in kg) / number of days on treatment between biopsies. Biochemistry measurements including SF and liver enzymes were performed at 3-monthly intervals. Blood counts were analyzed weekly for 8 weeks and thereafter bi-weekly. Cardiac function (ECHO) was assessed 6-monthly. UIE was measured quarterly; in pts receiving combination therapy on two different days, i.e. during DFP and combination therapy. Compliance was excellent in all three treatment arms. In total, 14 pts (15%) dropped out from the study: one due to biopsy failure at baseline, five withdrawals from informed consent, four non-compliance to treatment, one due to jaundice, one died from arrhythmia induced heart failure, and two (2.1%) developed agranulocytosis. The most common adverse events were transient increase in liver enzymes, nausea and arthralgia. The average change in LIC after one year was most pronounced in the combination arm (−47%; p=0.001), but LIC was also significantly lowered after one year monotherapy with DFO (−23%; p=0.13) or DFO (−45%; p=0.003). A reduction of the liver iron score acc. to Sciot was observed in all three treatment arms and the change after one year compared to baseline was statistically significant in the combination arm (p=0.0013). Further, the combination regimen was associated with the highest TIE (mean±SD: 0.46±0.22 mg/kg/d; p=0.00003). The majority of pts in all treatment arms showed a clear decrease in SF and the mean SF was significantly reduced in the combination arm after one year (−2′120μg/L; p=0.0003). The left ventricular ejection fraction increased during combination therapy (+3.4% absolute units; p=0.19), whereas it slightly decreased (−2.1% absolute units; p=0.41 and p=0.55, respectively) after either DFP or DFO treatment. The mean daily UIE was higher in DFP-containing regimens than with DFO single agent therapy. UIE on days of combination (0.90±0.33 mg/kg/24h) was significantly higher than on days of DFP monotherapy (0.53±0.26 mg/kg/24h) (p=0.0003). This study indicates that the combination of daily DFP and twice weekly DFO at standard doses is a highly efficacious and safe chelation therapy for pts with TM.

Rationale. The relative effects of monotherapy regimes with oral DFP or sc DFO or combinations of these drugs, on chelation efficiency, iron balance, plasma non-transferrin bound iron (NTBI) and the proportion and speciation of urine iron, have not been compared previously in prospective randomised trials. By examining these variables together in a single study, insights into the effectiveness and mechanisms of action of mono or combination regimens can be gained. Design. A total of 25 patients (pts) with thalassaemia major were randomised into one of the following 3 arms: DFP (LIPOMED AG, Switzerland) was given at a daily dose of 75 mg/kg either in combination with DFO (40–50 mg/kg twice weekly) or as single agent, and pts registered in the DFO control arm received 40–50 mg/kg sc DFO 5 days a week. All pts had been treated with DFO prior to the study. Methodology. Liver iron concentration (LIC) was measured by biopsy at baseline and after 1 year. Total iron excretion (IE)/day was calculated as (iron transfused/year (mg) + (LIC at To - LIC at T1y) x 10.6 x body wt in Kg) /number of days treatment. Chelation efficiency (%) was calculated as [IE (in mg/kg/day)/chelator dose (in mg/kg/day)] x [molecular weight of the respective chelator(s)/56]x n x 100, where 56 is the molecular weight of iron and n is 3 or 1 with DFP and DFO respectively. The average urinary iron excretion (UIE) (weeks 1, 12, 26, 38 and 54) was calculated from atomic absorption measurements. In patients receiving combination, UIE was measured during both days of monotherapy and combination therapy. The % UIE was calculated from mean UIE divided by total IE. In patients receiving DFO with or without DFP, the concentration of feroxamine species were measured in urine, collected into aluminised containers. Plasma NTBI was measured by HPLC at baseline and at weeks 1, 12, 26 and 54 standardised to blood transfusion interval. Results. The results show that DFO sc 5 days a week was the regimen associated with the largest and most efficient IE and stabilised NTBI after 1 year. Single agent DFP showed the lowest IE and efficiency, and a significant increase in NTBI (* p=0.001). The addition of sc DFO two days a week to DFP resulted in significant increase in IE (^ p=0.03) and stabilised NTBI. The proportion of UIE was significantly lower with DFO than with DFP regimens. UIE on the days of combination (0.89± 0.14mg/kg/d) was significantly higher than on days of DFP monotherapy (0.41 ±0.09 mg/kg/d) (p=0.002). Speciation of urinary iron showed that the proportion of DFO bound to iron was higher on days of combination treatment than with DFO monotherapy, consistent with shuttling of iron onto DFO by DFP. Conclusions. The addition of sc DFO twice weekly to DFP at 75mg/kg po is a regimen which appears as effective at producing iron balance as DFO given 5 days a week at standard doses. Both regimens are more effective at stabilising NTBI, and achieving iron balance than DFP at 75mg/kg/day. When DFP is combined with DFO, iron excretion appears to be mainly by the urinary route as feroxamine. Treatment Regimen Iron Excretion mg/kg/d NTBI change μM Efficiency (%) Mean over study Urine Iron (%) Mean over study DFP (n=12) 0.56±0.09 3.00±0.53 * 6.65±0.99 98±14.8 DFO (n=5) 0.77±0.25 0.72±0.45 23.1±10.7 28±10.3 DFP+DFO (n=8) 0.69±0.09 ^ 0.84±0.87 7.34±0.91 84±14.6