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Introduction Natural killer (NK) cells are key effectors in cancer immunosurveillance and posttransplant immunity, but shortage of environmental growth factors and deficient recognition of malignant cells may limit their anticancer efficacy. We hypothesized that the antibody-mediated anchoring of interleukin-2 (IL-2) to the leukemia-modified extracellular matrix (ECM) would increase NK cell abundance and activity to potentiate antibody-dependent cellular cytotoxicity (ADCC) against acute myeloid leukemia (AML) blasts. In this novel-novel combination dose-escalation phase 1 trial, we enrolled patients with AML relapse after allogeneic hematopoietic stem cell transplantation (HSCT) to evaluate the safety, pharmacokinetics, pharmacodynamics, and preliminary activity of F16IL2, an antibody-cytokine fusion protein composed of the human antibody fragment scFv(F16) in diabody format and two molecules of human IL-2, in combination with the Fc-optimized, ADCC-mediating anti-CD33 monoclonal antibody BI 836858. F16 specifically targets the A1 domain of the ECM protein tenascin C (TnC), which is spliced into the TnC molecule during active angiogenesis and tissue remodeling while it is virtually absent in normal tissues. Methods F16IL2 (10 - 20 Mio IU IV) was administered on days 1, 8, 15 and 22 of 28-day cycles, followed by administration of BI 836858 (10 - 40 mg IV) two days after each F16IL2 infusion. Dose escalation was performed over 4 dose levels (DL). Cohort 1 (10 Mio IU F16IL2 and 10 mg BI 836858, n = 5), cohort 2 (10 Mio IU F16IL2 and 20 mg BI 836858, n = 3), cohort 3 (20 Mio IU F16IL2 and 20 mg BI 836858, n = 4), cohort 4 (20 Mio IU F16IL2 and 40 mg BI 836858, n = 3). Safety and tolerability, pharmacodynamics and -kinetics, clinical efficacy and immune effector cell dynamics were investigated. This trial was registered at EudraCT as #2015-004763-37. Results Between December 2016 and March 2020, 15 patients with a median age of 50 years (range, 20 - 68) were enrolled and treated across 4 dose levels. Six patients (40%) had received two or more prior HSCT. The most frequent drug-related AEs (F16IL2 or BI 836858 or combination) were pyrexia (n = 13, 87%), chills (n = 12, 80%) and infusion-related reactions (n = 9, 60%), consistent with the expected toxicity profile of cytokine-armed or naked mAbs. These events were generally manageable, transient and of grade ≤ 2. One dose-limiting toxicity occurred at each of DL 3 (pulmonary edema) and 4 (acute GVHD). No patient died within the first 30 days of treatment initiation. Whereas no formal maximum tolerated dose (MTD) was reached, the maximum tested dose of 20 Mio IU F16IL2 and 40 mg BI 836858 was considered the recommended dose (RD). Three objective responses (1 CR, 1 CRi, 1 PR in extramedullary AML) were observed among 7 patients treated at the two higher DL, whereas no responses occurred at the two starting DL. Median OS among all 15 patients was 4.8 months (1.5 - 12.9), with a 6- and 12-month OS of 40% and 27%, respectively. Among those 7 patients whose AML was at least temporarily controlled with study treatment (CR/CRi, PR, SD), 12-month OS was 67% vs. 0% in non-responders. Combination therapy stimulated the expansion and activation of NK cells in bone marrow and peripheral blood. Conclusions To the best of our knowledge, this is the first study demonstrating that the strategy of potentiating ADCC with tumor-targeted immunocytokines is feasible in humans. In the difficult-to-treat situation of posttransplant AML relapse, responses were observed at higher DL, even in patients with extramedullary disease. The antibody-mediated targeted delivery of IL-2 to the ECM combined with anti-CD33 immunotherapy represents an innovative experimental approach associated with acceptable safety and encouraging biologic and clinical activity in posttransplant AML relapse. Disclosures Wermke: Novartis, Roche, Pfizer, BMS: Consultancy, Honoraria, Research Funding. Hemmerle: Philogen S.p.A.: Current Employment. Schäfers: Philogen S.p.A.: Research Funding. Rossig: BMS and Celgene: Honoraria; Pfizer: Honoraria; Novartis: Honoraria; AdBoards by Amgen: Honoraria. Stelljes: Pfizer: Consultancy, Research Funding, Speakers Bureau; Kite/Gilead: Consultancy, Speakers Bureau; Novartis: Consultancy, Speakers Bureau; MSD: Consultancy, Speakers Bureau; Celgene/BMS: Consultancy, Speakers Bureau; Medac: Speakers Bureau; Amgen: Consultancy, Speakers Bureau. Rueter: Boehringer Ingelheim Pharma GmbH & Co. KG: Current Employment. Neri: Philogen S.p.A.: Current Employment, Current equity holder in publicly-traded company, Divested equity in a private or publicly-traded company in the past 24 months, Membership on an entity's Board of Directors or advisory committees, Patents & Royalties: Multiple patents on vascular targeting; ETH Zurich: Patents & Royalties: CD117xCD3 TEA. Berdel: Philogen S.p.A.: Consultancy, Current equity holder in publicly-traded company, Honoraria, Membership on an entity's Board of Directors or advisory committees. Schliemann: Roche: Consultancy; Philogen S.p.A.: Consultancy, Honoraria, Research Funding; Astellas: Consultancy; Pfizer: Consultancy; BMS: Consultancy, Other: travel grants; Boehringer-Ingelheim: Research Funding; Novartis: Consultancy; Jazz Pharmaceuticals: Consultancy, Research Funding; AstraZeneca: Consultancy; Abbvie: Consultancy, Other: travel grants.

Introduction:Eltrombopag has been available in Europe for the treatment of chronic primary immune thrombocytopenia (ITP) since 2010. Since 2019, it has been indicated in patients with primary ITP, lasting 6 months or longer from diagnosis and who are refractory to other treatments, aged 1 year and above. However, data are lacking regarding the use, the efficacy and the safety of eltrombopag in clinical practice in Europe. The ELEXTRA study aimed to assess these questions in France. The intermediate results were presented at the 2019 ASH Annual Meeting. We present here the final results of the ELEXTRA study. Methods:Population source was the CARMEN-France registry. The CARMEN (Cytopénies Auto-immunes : Registre Midi-PyréneEN) registry is aimed at the prospective follow-up of all incident ITP adults in the French Midi-Pyrénées region (South-West of France, 3 million inhabitants) since June 2013. Each investigator follows all adult patients (aged ≥18 years) newly diagnosed with ITP in routine visits or hospital stays, and detailed information on patients' characteristics and management of ITP are prospectively recorded. This registry has been implemented in other French centers since 2016, taking the name of CARMEN-France. ITP was defined by platelet count Results:Out of 795 patients included in the registry, 156 (19.6%) had been exposed to eltrombopag for a median duration of 100 days (range: 1-1427). Mean age was 60.2 years (standard deviation: 20.9) and 79 (50.6%) were males; 60 (38.5%) had at least one comorbidity of the Charlson Comorbidity Index score; 89 (57.1%) had at least one cardiovascular risk factor (not including age and sex) and 9 (5.8%) a history of venous thrombosis. At ITP diagnosis, the median platelet count was 8 x 109/L (range: 1-88 x 109/L) and 118 (75.6%) patients had bleeding. Median time from ITP onset to first exposure to eltrombopag was 3.3 months (range: 0.1-82.2): 74 (47.4%) patients were exposed before 3 months of ITP duration, 21 (13.5%) between 3 and 6 months and 61 (39.1%) after 6 months. Exposures to ITP treatments before eltrombopag initiation were: corticosteroids in 150 (96.2%) patients, intravenous immunoglobulin (IVIg) in 106 (67.9%), dapsone in 28 (17.9%), rituximab in 26 (16.7%), romiplostim in 12 (7.7%), hydroxychloroquine in 14 (9.0%), danazol in 8 (5.1%), vinblastine in 5 (3.2%), azathioprine in 2 (1.3%), ciclosporin in 1 (0.6%) and splenectomy in none. Eltrombopag was used as second-line agent in 52 (33.3%) patients and third-line in 56 (35.9%). Among the 156 patients, 75 (48.1%) had a platelet count Conclusion:In French real-world practice, eltrombopag is used early in the ITP course. Efficacy is similar to that observed in clinical trials. The safety profile identified in clinical trials is also confirmed. Disclosures Moulis: Grifols: Research Funding; Amgen: Other: meeting attendance grant; Novartis SAS: Membership on an entity's Board of Directors or advisory committees, Other: meeting attendance grant, Research Funding. OffLabel Disclosure: Real-World use of eltrombopag in immune thrombocytopenia

Introduction: Eltrombopag has been marketed in Europe in 2010 for the treatment of chronic primary immune thrombocytopenia (ITP) lasting 12 months or longer from diagnosis, refractory to other treatments in splenectomized patients or patients who are contraindicated for splenectomy. Based on results of clinical trials, this marketing indication has been modified in 2019 for the treatment of patients aged 1 year and above with primary ITP lasting 6 months or longer from diagnosis and who are refractory to other treatments. However, data are lacking regarding the use, the efficacy and the safety of eltrombopag in the clinical practice in Europe. The ELEXTRA study was aimed at assessing these questions in France. Methods: Population source was the CARMEN-France registry. The CARMEN (Cytopénies Auto-immunes : Registre Midi-PyréneEN) registry is aimed at the prospective follow-up of all incident ITP adults in the French Midi-Pyrénées region (South-West of France, 3 million inhabitants) since June 2013. Each investigator follows all adult patients (aged ≥18 years) newly diagnosed for ITP in routine visit or hospital stay and detailed information on patients' characteristics and management of ITP are prospectively recorded. This registry has been implemented in other French centers since 2016, taking the name of CARMEN-France. ITP was defined by platelet count Results: Out of 552 patients included in the registry, 81 (14.7%) had been exposed to eltrombopag for a median duration of 92 days (range: 1-1523). Mean age was 60.9 years (standard deviation: 20.9) and 45 (55.6%) were males; 36 (44.4%) had at least one comorbidity of the Charlson Comorbidity Index score; 45 (55.6%) had at least one cardiovascular risk factor (not including age and sex) and 4 (4.9%) a history of venous thrombosis. At ITP diagnosis, median platelet count was 7 x 109/L (range: 1-88 x 109/L) and 67 (82.7%) patients had bleeding. Median time from ITP onset to first exposure to eltrombopag was 2.7 months (range: 0.2-72.2): 43 (53.1%) patients were exposed before 3 months of ITP duration, 8 (9.9%) between 3 and 6 months, 18 (22.2%) between 6 and 12 months and 12 (14.8%) after 12 months. Exposures to ITP treatments before eltrombopag initiation were: corticosteroids in 75 (92.6%) patients, intravenous immunoglobulin (IVIg) in 61 (75.3%), dapsone in 15 (18.5%), rituximab in 14 (17.3%), romiplostim in 10 (12.3%), hydroxychloroquine in 9 (11.1%), danazol in 5 (6.2%), vinblastine in 3 (3.7%), azathioprine in 1 (1.2%), ciclosporin in 1 (1.2%) and splenectomy in none. Eltrombopag was used as second-line agent in 24 (28.6%) patients and third-line in 20 (24.7%). Among the 81 patients, 39 (48.1%) had a platelet count 6 months), age groups ( Conclusion: In the French real-life practice, eltrombopag is used early in ITP course. Efficacy is similar to efficacy in clinical trials, and is stable by subgroups of patients. The profile of ADRs identified in clinical trials is also confirmed. Introduction: Eltrombopag has been marketed in Europe in 2010 for the treatment of chronic primary immune thrombocytopenia (ITP) lasting 12 months or longer from diagnosis, refractory to other treatments in splenectomized patients or patients who are contraindicated for splenectomy. Based on results of clinical trials, this marketing indication has been modified in 2019 for the treatment of patients aged 1 year and above with primary ITP lasting 6 months or longer from diagnosis and who are refractory to other treatments. However, data are lacking regarding the use, the efficacy and the safety of eltrombopag in the clinical practice in Europe. The ELEXTRA study was aimed at assessing these questions in France. Methods: Population source was the CARMEN-France registry. The CARMEN (Cytopénies Auto-immunes : Registre Midi-PyréneEN) registry is aimed at the prospective follow-up of all incident ITP adults in the French Midi-Pyrénées region (South-West of France, 3 million inhabitants) since June 2013. Each investigator follows all adult patients (aged ≥18 years) newly diagnosed for ITP in routine visit or hospital stay and detailed information on patients' characteristics and management of ITP are prospectively recorded. This registry has been implemented in other French centers since 2016, taking the name of CARMEN-France. ITP was defined by platelet count Results: Out of 552 patients included in the registry, 81 (14.7%) had been exposed to eltrombopag for a median duration of 92 days (range: 1-1523). Mean age was 60.9 years (standard deviation: 20.9) and 45 (55.6%) were males; 36 (44.4%) had at least one comorbidity of the Charlson Comorbidity Index score; 45 (55.6%) had at least one cardiovascular risk factor (not including age and sex) and 4 (4.9%) a history of venous thrombosis. At ITP diagnosis, median platelet count was 7 x 109/L (range: 1-88 x 109/L) and 67 (82.7%) patients had bleeding. Median time from ITP onset to first exposure to eltrombopag was 2.7 months (range: 0.2-72.2): 43 (53.1%) patients were exposed before 3 months of ITP duration, 8 (9.9%) between 3 and 6 months, 18 (22.2%) between 6 and 12 months and 12 (14.8%) after 12 months. Exposures to ITP treatments before eltrombopag initiation were: corticosteroids in 75 (92.6%) patients, intravenous immunoglobulin (IVIg) in 61 (75.3%), dapsone in 15 (18.5%), rituximab in 14 (17.3%), romiplostim in 10 (12.3%), hydroxychloroquine in 9 (11.1%), danazol in 5 (6.2%), vinblastine in 3 (3.7%), azathioprine in 1 (1.2%), ciclosporin in 1 (1.2%) and splenectomy in none. Eltrombopag was used as second-line agent in 24 (28.6%) patients and third-line in 20 (24.7%). Among the 81 patients, 39 (48.1%) had a platelet count 6 months), age groups ( Conclusion: In the French real-life practice, eltrombopag is used early in ITP course. Efficacy is similar to efficacy in clinical trials, and is stable by subgroups of patients. The profile of ADRs identified in clinical trials is also confirmed. Disclosures Moulis: Novartis pharma: Research Funding, Speakers Bureau; Amgen pharma: Research Funding, Speakers Bureau; CSL Behring: Research Funding. OffLabel Disclosure: Eltrombopag was used off-label in some patients in this real-life study

Introduction The oral BTK inhibitor ibrutinib is highly effective at inducing partial responses (PR) in relapsed or refractory (R/R) CLL and MCL; however, complete responses (CR) are rare, and the durability of response for CLL patients (pts) with complex cytogenetics or del(17p) and for pts with MCL is limited. TGR-1202 is a novel oral PI3K-delta specific inhibitor designed to have less toxicity than other PI3K inhibitors, making it a logical drug to explore in combination regimens. We hypothesized that PI3K/BTK blockade would be tolerable and efficacious in R/R CLL and MCL. Methods This is a phase I/Ib investigator-initiated multicenter trial with primary objectives of determining the RP2D (recommended phase 2 dose) and the safety/tolerability of TGR-1202 plus ibrutinib in pts with R/R CLL or MCL. Secondary objectives are to assess overall response rates (ORR), CR rates, PFS, and OS. Pts receive continuous daily oral dosing of ibrutinib (420 mg CLL, 560 mg MCL) and TGR-1202. In phase I, TGR-1202 dose levels started at 400 mg daily and escalated in a standard 3 + 3 design to 600, then 800 mg daily. CLL and MCL pts were evaluated in separate arms, with a 28 day DLT observation period. Pts continue both drugs until progression or unacceptable toxicity. Eligibility criteria: ≥1 prior therapy, requiring treatment by IW-CLL criteria (CLL arm), ECOG PS ≤2, and adequate hematologic and organ function. Prior BTK or PI3K inhibitors were allowed. CTCAE v4 and IW-CLL or Cheson criteria (MCL) were used to evaluate toxicity and efficacy, with response evaluations after 2 mo., every 3 mo. up to 1 year, and every 6 mo. thereafter. Results As of July 26, 2016, 28 pts were evaluable, including 17 CLL and 11 MCL pts. The median age at enrollment was 67 yrs. (range 48-83). The median number of prior therapies was 2 for CLL (range 1-6, including 2 who started ibrutinib prior to enrollment and 3 with prior PI3Ki who came off prior PI3Ki for reasons other than progressive disease) and 3 for MCL (range 2-5, including 4 with prior autoSCT and 2 with prior ibrutinib). In CLL pts, del(17p) was present in 4/17 (24%), del (11q) in 7/17 (41%), unmutated IGHV in 11/17 (65%), and NOTCH1 or TP53 (without del(17p)) mutation in 2 pts each. In phase I, there were no DLTs in either arm, and the RP2D of TGR-1202 for both CLL and MCL was identified as 800 mg. Hematologic toxicities in CLL include: neutropenia (18%: 6% gr3, 12% gr4), thrombocytopenia (12%, all gr1), and anemia (12%, all gr1/2). All grade non-hematologic toxicities in >20% of CLL pts include: diarrhea (24%: 18% gr1, 6% gr2) and nausea (24%, all gr1). SAEs include gr 3 atrial fibrillation, lipase elevation, and adrenal insufficiency in 1 pt each, 1 pt with CNS aspergillus infection that likely preceded enrollment, and 1 case of sudden death of uncertain cause. Three CLL pts had dose-reduction of ibrutinib (atrial fibrillation, palpitations, vitreous hemorrhage). Hematologic toxicities in MCL include: neutropenia (18%, 6% gr4), thrombocytopenia (18%, 6% gr3), and anemia (18%, 6% gr3). All grade non-hematologic toxicities in >20% of MCL pts include: diarrhea (29%, all gr1), fatigue (29%, all gr1/2), and 24% each for nausea (all gr1/2) and dizziness (all gr1). SAEs included gr3 hypophosphatemia in 2 pts and gr4 lipase elevation in 1 pt. One MCL pt had dose reduction of TGR-1202 (dizziness). Study-wide, 5/28 (18%) pts had transaminitis, all gr1, and bleeding events included gr1 epistaxis, hematuria, and vitreous hemorrhage in 1 CLL pt each. For CLL, the ORR is 82% (14/17), with 35% PR-L (6/17), 41% PR (7/17), and 6% CR (1/17) with bone marrow MRD positivity. 6/8 CLL pts in PR on treatment for ≥6 mo. have residual LN's Conclusions We report preliminary results of the first dedicated study to look at a PI3Ki plus BTKi doublet in B cell malignancies. TGR-1202 plus ibrutinib is well-tolerated in pts with R/R CLL and MCL, with no DLTs observed. The RP2D of TGR-1202 for both CLL and MCL is 800 mg daily. Preliminary efficacy data suggest a high response rate in both diseases, with several CLL pts close to radiographic CR. Phase Ib expansion cohorts at 800 mg continue to accrue in this ongoing study (NCT 02268851). Disclosures Davids: Infinity: Honoraria, Research Funding; Pharmacyclics: Consultancy, Honoraria, Research Funding; Janssen: Consultancy, Honoraria; Gilead: Honoraria; Abbvie: Consultancy, Honoraria; TG Therapeutics: Honoraria, Research Funding; Genentech: Consultancy, Honoraria, Research Funding. Miskin:TG Therapeutics, Inc: Employment, Equity Ownership. Sportelli:TG Therapeutics, Inc.: Employment, Equity Ownership. Arnason:Gilead: Consultancy. Jacobson:Kite: Membership on an entity's Board of Directors or advisory committees. Fisher:Pharmacyclics: Consultancy. Brown:Janssen: Consultancy; Abbvie: Consultancy; Celgene: Consultancy; Infinity: Consultancy; Sun BioPharma: Consultancy; Roche/Genentech: Consultancy; Gilead Sciences: Consultancy; Pfizer: Consultancy.

Myelodysplastic syndrome (MDS) is one of the major types of acquired bone marrow failure characterized by impaired peripheral blood cell production (anemia and cytopenias). Although much has been learned regarding the molecular genetic events involved in the pathogenesis of the MDS hematopoietic stem/progenitor cell compartment (HSC/HPC), investigations of the environmental pressures underlying disease initiation have been limited. Prior investigations have shown that inflammation in the bone marrow microenvironment contributes to hematopoietic impairment, with inflammatory molecules providing regulatory cues driving the proliferation and apoptotic death of HSC/HPC. We have reported that, the accumulation of myeloid-derived suppressor cells (MDSCs) in the local inflammatory bone marrow microenvironment plays a major role in the direct pathogenesis of MDS. MDSCs function by producing mediators and inflammatory cytokines capable of suppressing hematopoiesis and are defined by the lack of all lineage markers and only one key surface receptor, CD33 (CD33+HLA-DR−Lin−). We recently uncovered that this receptor is greatly expressed in MDSC isolated from patients with MDS and plays an important role in MDSC-mediated hematopoietic suppressive function. We also found that this ITIM (immune-receptor tyrosine-based inhibitor motif) containing molecule could induce suppressive cytokines after its engagement with its newly identified ligand S100A9. Therefore, we tested the hypothesis that with a fully human IgG1 monoclonal antibody against CD33 (mAb33.1) we could prevent the engagement of this ligand/receptor pair as well as induce ADCC of pathogenic MDSC through the reduction in the accumulation of CD33+ MDSC, the immune suppression and the restoration of hematopoiesis in MDS bone marrow specimens. After testing primary specimens with mAb33.1 we saw a significant increase in ADCC activity via NK as evidenced by significant reduction in the proportion of MDSC in culture as compared to isotype control treated cells. This decrease correlated with an increase in CD107a granule mobilization as well as an increased cytotoxicity in a killing assay without changing the proportion of NK cells in the culture. Functionally, the concentration of secreted IL-10, TGFb and VEGF were decreased, as was the gene expression of these suppressive cytokines after treatment with mAb33.1 but was restored when the antibody was cross-linked with an anti-human IgG antibody demonstrating the blocking ability of the antibody in preventing CD33 downstream signaling. Importantly, all of these observations correlated with the restoration of hematopoiesis, as there was a significant increase in the formation of CFU-GM and BFU-E colonies on a methylcellulose assay (n=9). In addition mAb33.1 also displayed a protective effect on HSC by blocking ROS production and reducing DNA damage, as demonstrated by comet and H2AX assays. This work provides the ground for the development of a novel group of therapies directly aimed at the suppressive MDSC and blockage of their signaling, rather than directly targeting the malignant clone, with the long term goal of improving the local microenvironment. This strategy will provide the background to assess its clinical potential to serve as a therapeutic target in MDS and AML. Disclosures No relevant conflicts of interest to declare.

Introduction Recent developments of novel immunotherapeutic drugs have shown promising results for patients with hematologic malignancies, however, an unmet need for accurate and specific biomarkers persists. To address this need, we developed a novel integrative analysis procedure for the automated analysis of multidimensional flow cytometry data obtained from the peripheral blood of patients with chronic lymphocytic leukemia (CLL). State of the art flow cytometry analysis is accomplished by manual sequential segmentation, or gating, of cell populations based on similarities in fluorescence and light scatter characteristics through visualization of the data in one- or two-dimensional plots. This approach has a number of limitations, including the subjective nature of the gating and the inability to fully utilize the high-dimensional data. Recent efforts have produced sophisticated computational methods that overcome many of these limitations; however, these newer computational methods have not been rigorously tested in a clinical context and have focused on the rigorous and automated analysis of samples from individual patients, with substantially less effort towards the analysis of patient populations. The ultimate goal of our analysis is to develop computational approaches that will enable an identification of subsets of patients with distinct immunological markers. Methods We developed a novel analysis framework that facilitates automated identification of both common cell types and patient population subgroups, based on post-processing of individual sample analysis with the FLOCK program. FLOCK identifies clusters of putatively similar cells in an individual sample by multidimensional clustering of the fluorescence marker and light-scattering measurements. We developed a rigorous hierarchical clustering approach to identify common “cell signatures” across multiple patients. The cell signatures were then mapped back onto the individual patient samples and used in a second clustering that identified patient subgroups based on similar abundances of specific cell types. Results We used our analytic framework to analyze multidimensional flow cytometry data (26 cell surface markers in 4 different antibody cocktails) from peripheral blood specimens of a heterogeneous group of 55 CLL patients and 13 healthy controls. Our analysis revealed distinct differences between controls and CLL patients. Analyzing the non-malignant peripheral blood cell types, we were furthermore able to differentiate between distinct clinical subpopulations of patients (e.g. identify treatment-naïve patients from those that had previously undergone chemotherapy). Conclusion/Discussion Using a novel integrative analysis procedure to analyze complex flow cytometry data of the peripheral blood from CLL patients, we are able to identify distinct cell type distributions. We propose that this information is a marker for the overall health/disease status of the corresponding patient, and could ultimately be used for diagnosis, prognosis, and selection of optimal treatment. In the context of multiple novel treatment options for CLL patients, such a tool will be crucial for defining individual patient prognosis, and defining an accurately matched treatment plan. Disclosures: No relevant conflicts of interest to declare.