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The prognosis of relapsed/refractory (R/R) anaplastic large cell lymphoma (ALCL) is poor. Large studies evaluating outcomes of allogeneic haematopoietic cell transplantation (allo-HCT) in systemic R/R ALCL are not available. Using the Center for International Blood and Marrow Transplant Research (CIBMTR) database, we evaluated outcomes of 182 adults (aged ≥18 years) with R/R ALCL undergoing allo-HCT between 2008 and 2019. Non-relapse mortality (NRM), disease relapse/progression (REL), progression-free survival (PFS), and overall survival (OS) were modelled using Cox proportional hazards models. The median (range) follow-up of survivors was 62 (3-148) months. The 1-year NRM was 18%. The 5-year REL, PFS and OS were 32%, 41% and 56% respectively. On multivariable regression analysis African American race (hazard ratio [HR] 2.7, 95% confidence interval [CI] 1.6-4.8; p 0.001) and refractory disease at allo-HCT (HR 3.2, 95% CI 1.6-6.2; p 0.001) were predictive of inferior OS. Similarly, African-American race (HR 2.1, 95% CI 1.3-3.4; p = 0.003), other minority race (HR 2.5, 95% CI 1.2-5.3; p = 0.02) and refractory disease (HR 2.2, 95% CI 1.2-4.3; p = 0.01) were predictive of inferior PFS. These data, demonstrate that allo-HCT can result in durable disease control in a sizable proportion of patients with R/R ALCL. Refractory disease and racial minority status predicted inferior allo-HCT outcomes. Whether the inferior outcomes of racial minorities with R/R ALCL after allo-HCT are driven by differences in disease biology or disparities in post allo-HCT care, or both, requires further investigation.

Chimeric antigen receptor (CAR) modified T cell therapy has transformed the management of relapsed/refractory B cell malignancies. Despite high overall response rates, relapse post CAR T treatment remains a clinical challenge. Loss of target antigen, specifically CD19, is one well-defined mechanism of disease relapse. The mechanism of CD19 loss and which patients are at higher risk of CD19 loss remain poorly understood. To overcome CD19 loss, CARs targeting multiple antigens are being tested in clinical trials. CD19/20 and CD19/22 bispecific CARs demonstrate cytotoxicity against CD19-negative cells in preclinical studies. These CARs have also shown efficacy, safety, and a relatively low rate of CD19-negative relapse in phase I trials. These small studies suggest that multispecific CAR T cells can deprive lymphomas of escape via antigen loss. However, the selection of an ideal target, the right CAR construct, and whether these multispecific CARs can induce long-term remissions are still under investigation. Expected final online publication date for the

Chimeric antigen receptor (CAR)-modified T-cell therapy has revolutionized the treatment of relapsed/refractory B-cell malignancies including acute lymphoblastic leukemia and non-Hodgkin lymphoma. All of the CARs approved for clinical use in treating B-cell malignancies are directed against a single antigen, CD19. Although the initial response rates are high, a significant number of patients relapse, with antigen loss being one proposed mechanism of treatment failure. Multi-targeted CAR T approaches are now being developed to overcome this limitation of currently approved CAR products.Here, we discuss the mechanism of antigen loss, various bispecific CAR T-cell constructs, and their efficacy and safety in the preclinical as well as clinical settings.Although CD19 CAR T-cells have significantly improved response rates in relapsed/refractory B-cell malignancies, relapse remains a major barrier to long-term survival. Bispecific CAR T-cells offer an alternative approach to mitigate relapse associated with antigen loss. In B-cell malignancies, various bispecific CAR constructs are being studied. The CD19/CD20 and CD19/CD22 bispecific CARs have shown a favorable efficacy and safety profile in phase I trials. However, larger phase II studies and longer follow-ups are needed to better assess their efficacy and safety in patients with relapsed/refractory B-cell malignancies.

Marginal zone lymphoma (MZL) is an indolent B-cell non-Hodgkin Lymphoma (NHL) that can be further classified into 3 sub-types: nodal, extra-nodal and splenic [1]. MZL rarely involves the central ne...

Loncastuximab tesirine-lpyl (ADC Therapeutics) is an anti-CD19 antibody-drug conjugate which consists of anti-CD19 antibody and cytotoxic alkylating agent, SG3199. Data from preclinical in vitro and animal studies demonstrated its selectivity and efficacy. The phase I LOTIS-1 study for relapsed, refractory B-cell non-Hodgkin lymphoma (NHL) demonstrated efficacy and a tolerable safety profile, with major adverse effects being neutropenia, thrombocytopenia, elevated liver enzymes, and fluid accumulation. Based on pharmacokinetics analysis in this study, a dose of 150 μg/kg every 3 weeks for cycles 1 and 2 followed by 75 μg/kg every 3 weeks until disease progression or intolerability was chosen for the phase II LOTIS-2 study. This study recruited relapsed, refractory diffuse large B-cell lymphoma and confirmed similar safety profile. Overall response rate was 48.6% (24.1% complete response), and overall survival was 9.9 months. Due to its safety and efficacy reported in the above trials, loncastuximab tesirine was recently approved by the US Food and Drug Administration for the treatment of relapsed, refractory diffuse large B-cell lymphoma. Several clinical trials are ongoing to assess its safety and efficacy in NHL in various clinical settings.

Venetoclax, a BCL-2 inhibitor, is highly effective for the treatment of patients with chronic lymphocytic leukemia (CLL) and dependence on alternative proteins may result in resistance to BCL-2 inhibition. Patients with CLL treated with venetoclax as monotherapy at MD Anderson Cancer Center between 05/2012 and 01/2016 were included and pretreatment bone marrow was analyzed by immunohistochemistry (IHC) for BCL-W, BCL-XL, BCL2-A1 and MCL-1. Twenty-seven patients were included. BCL-W + and BCL-2A1+ was found in 15% and 7% of the patients, respectively. Both BCL-XL and MCL-1 were negative in all samples. A higher CR and longer PFS rates were observed in patients with BCL-W+ (

Corticosteroids are used to treat the acute complications of chimeric antigen receptor (CAR) T-cell therapy. Strati et al examine the impact of corticosteroids on patient outcomes following CAR T-cell therapy for large B-cell lymphoma. Use of higher doses of steroids is associated with shorter progression-free survival at 10 months and decreased overall survival., Key Points Higher cumulative dose of corticosteroids is associated with early progression after CAR-T therapy in large B-cell lymphoma.Higher cumulative dose and prolonged, early corticosteroid use is associated with shorter overall survival after CAR-T therapy., Visual Abstract, Corticosteroids are commonly used for the management of severe toxicities associated with chimeric antigen receptor (CAR) T-cell therapy. However, it remains unclear whether their dose, duration, and timing may affect clinical efficacy. Here, we determined the impact of corticosteroids on clinical outcomes in patients with relapsed or refractory large B-cell lymphoma treated with standard of care anti-CD19 CAR T-cell therapy. Among 100 patients evaluated, 60 (60%) received corticosteroids for management of CAR T-cell therapy–associated toxicities. The median cumulative dexamethasone-equivalent dose was 186 mg (range, 8-1803) and the median duration of corticosteroid treatment was 9 days (range, 1-30). Corticosteroid treatment was started between days 0 and 7 in 45 (75%) patients and beyond day 7 in 15 (25%). After a median follow-up of 10 months (95% confidence interval, 8-12 months), use of higher cumulative dose of corticosteroids was associated with significantly shorter progression-free survival. More importantly, higher cumulative dose of corticosteroids, and prolonged and early use after CAR T-cell infusion were associated with significantly shorter overall survival. These results suggest that corticosteroids should be used at the lowest dose and for the shortest duration and their initiation should be delayed whenever clinically feasible while managing CAR T-cell therapy–associated toxicities.

Objective To perform a systematic review and meta-analysis evaluating the prevalence of gastrointestinal (GI) symptoms and mortality in patients with coronavirus disease 2019 (COVID-19) diagnosed. Methods A systematic search of MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials, Cochrane Database of Systematic Reviews, and Scopus was performed from December 1, 2019 to May 7, 2020. Observational studies including adults with COVID-19 infection and reporting GI symptoms were included. The primary outcome was assessing the weighted pooled prevalence (WPP) of GI symptoms in patients with COVID-19 infection. Secondary outcomes were WPP of overall mortality, and mortality in patients with COVID-19 infection with GI symptoms. Results A total of 78 studies with 12,797 patients were included. Among GI symptoms (at onset of illness in 6, at admission in 17, data given separately for both in 3, and data unavailable in 52 studies), the WPP of diarrhea was 12.4% (95% CI, 8.2% to 17.1%), I2=94%; nausea and/or vomiting, 9.0% (95% CI, 5.5% to 12.9%), I2=93%; loss of appetite, 22.3% (95% CI, 11.2% to 34.6%, I2=94%; and abdominal pain, 6.2% (95% CI, 2.6% to 10.3%), I2=92%. Mortality among patients with GI symptoms (0.4%; 95% CI, 0% to 1.1%; I2=74%) was similar to overall mortality (2.1%; 95% CI, 0.2% to 4.7%; I2=94%), P=.15. Most studies had high risk of bias and overall quality of evidence was low to very low for all outcomes. Conclusion Gastrointestinal symptoms are seen in up to 1 in 5 patients with COVID-19 infection. More high-quality evidence is needed to confirm these findings and explore factors causing mortality in these patients.

Introduction: Despite progress made in the treatment of multiple myeloma (MM), a significant percentage of patients are unable to receive second line of therapy. Our study evaluated the burden of infectious complications, and other factors that may play a role in hindering patients from receiving subsequent lines of therapy at a comprehensive teaching hospital. Methods: Patients with MM treated between 2014 and 2019 at Rochester General Hospital were selected from the MM registry. Tool was designed on REDCap for retrospective data collection from electronic medical records. Patients who declined therapy, never received treatment, had smoldering myeloma, or with a concomitant immunocompromising state were excluded. Out of 159 patients, 119 were eligible for analysis. We studied the relationship between patient demographics, clinical characteristics, treatment regimens, and outcomes. Binary logistic regression was used to determine which factors were significant in determining advancement in the line of treatment. The chi-squared statistic was used to determine significance with a Type I error rate set at 0.05. Results: The median age at diagnosis of MM was 68.5 years (Interquartile range=59.2-76.9), 55.4% (n=66) were males, 72.3% (n=86) were Caucasian. Revised International Staging System (R-ISS) staging was available for 77 patients, 27.3% (n=21) were stage I, 58.4% (n=45) were stage II, and 14.3% (n=11) were stage III. Cytogenetics were available for 93 patients, 76.3% (n=71) were standard risk and 23.7% (n=22) were high risk [17p del, t(4;14) or t(4;16)]. A three-drug induction regimen was administered to 61.3% (n=73) patients. Autologous stem cell transplant was performed in 39.5 % (n=47). Sixty-seven patients (56.3 %) received second line therapy. Twenty-six patients did not have a relapse after the first line at the time of data censorship. Patients who did not receive a second line treatment after relapse or progression were 21.8% (n=26). The factors prohibiting proceeding to a second line regimen (can be multiple) included patient preference/poor performance status (n=15), death while on first line treatment (n=15), advanced age (n=6) and prohibitive co-morbidity (n=4). Binary logistic regression showed age to be a significant negative predictor for receiving second line therapy. The odds ratio (OR) of receiving second line therapy was 0.88 for every year increase in age, 95% CI (0.78-0.95), p=0.007 (Figure 1). One or more documented infections within 6 months of diagnosing MM or until transplant date occurred in 32.8% (n=39). Types of infections are depicted in Figure 2. Documented infection was a borderline significant negative predictor for receiving second line therapy with OR =0.23, 95% CI (0.05-1.003), p=0.059. Race, pre-existing chronic kidney disease (CKD), gender and high-risk cytogenetics were not significant predictors of receiving second line therapy (Figure 1). Conclusion: Our study identified advancing age as a significant negative predictive factor to receipt of second line therapy in MM. Documented infections, while borderline significant, had a high impact as to whether a patient receives second line therapy. Strategies such as a formalized geriatric assessment, tailored treatment for frail patients, and infection prevention measures might increase odds of receiving second line therapy and may result in improved outcomes. Disclosures Jamshed: Takeda, Amgen and Celgene: Honoraria.

Introduction: Venetoclax is an oral inhibitor of the anti-apoptotic protein BCL-2, and is highly effective for the treatment of patients with chronic lymphocytic leukemia (CLL). Dependence of CLL cells on alternative anti-apoptotic proteins may result in intrinsic resistance to BCL-2 inhibition. The predictive and prognostic role of the expression of BCL-2 alternative proteins in CLL patients treated with venetoclax has not been yet explored. Methods: Patients with CLL treated with single agent venetoclax at MD Anderson Cancer Center between 05/2012 and 01/2016, and with available pre-treatment bone marrow samples, were included in the study. All samples were analyzed by immunohistochemistry (IHC) for BCL-W, BCL-XL, BCL2-A1 and MCL-1, and >1 positive CLL cells per high power field (40X) was considered positive. Response was assessed according to 2008 iwCLL guidelines, using the clinical and imaging criteria. Results: Twenty-seven patients were included in the study: 74.1% were male, 50% aged > 65 years, and 63% had Rai stage III-IV; 26% had mutated IGHV, 48% had del17p/del11q by FISH, and 40% had a complex karyotype by metaphase cytogenetics; 96% had been previously treated, 37% with a BTK inhibitor. Overall, 15% had pre-treatment bone marrow samples positive for BCL-W, and 7% for BCL-2A1 (Figure), while none of the samples was positive for BCL-XL or MCL-1. Overall response rate was 93%, and 14 (52%) patients achieved CR. A higher CR rate was observed in patients with positive BCL-W (75% vs 48%, p=0.60), positive BCL-2A1 (100% vs 48%, p=0.60), and double positive patients (80% vs 45%, p=0.33), though not statistically significant After a median follow-up of 50 months (95%CI, 46-54 months), 13 (48%) patients progressed, and median progression-free survival (PFS) was 51 months (95% CI, 27-75 months). A longer median PFS was observed for patients with positive BCL-W (not reached [NR] vs 36 months, p=0.46), positive BCL-2A1 (NR vs 35 months, p=0.29), and double positive patients (NR vs 36 months, p=0.20)(Figure 2), though not statistically significant. At most recent follow-up, 9 (33%) patients died, all of progressive disease, and median overall survival (OS) was 65 months (range, 2-65 months). A longer median OS was observed for patients with positive BCL-W (NR vs 65 months, p=0.19), positive BCL-2A1 (NR vs 65 months, p=0.36), and double positive patients (NR vs 65 months, p=0.12) (Figure), though not statistically significant. Conclusion: Pre-treatment expression of BCL-2 alternative proteins by IHC does not predict response to venetoclax in patients with CLL. More sensitive techniques, such as gene expression profiling and BH3 profiling, are needed to explore the predictive role of alternative anti-apoptotic pathways in these patients. Dependence on alternative BCL-2 proteins may associate with a better outcome for CLL patients, and larger dataset are needed to confirm this finding. Citation Format: Fateeha Furqan, Ellen J. Schlette, Francisco Vega, Ignacio I. Wistuba, Luisa M. Soto, Mario L. Piubelli, William G. Wierda, Alessandra Ferrajoli, Paolo Strati. Expression of BCL2 alternative proteins and association with outcome in CLL patients with venetoclax [abstract]. In: Proceedings of the Annual Meeting of the American Association for Cancer Research 2020; 2020 Apr 27-28 and Jun 22-24. Philadelphia (PA): AACR; Cancer Res 2020;80(16 Suppl):Abstract nr 801.

8011 Background: Corticosteroids are commonly used for management of severe toxicities associated with chimeric antigen receptor (CAR) T-cell therapy. However, it remains unclear whether the dose, duration, and timing of corticosteroid therapy may impact clinical efficacy of CAR T-cell therapy. Methods: This is a retrospective analysis of patients with relapsed or refractory LBCL treated with standard of care axi-cel at MD Anderson Cancer Center, Houston, Texas between 01/2018 and 05/2019 (data cut-off 12/21/2019). Progression-free survival (PFS) was defined as time from axi-cel infusion to progression/death or last follow-up, and the Breslow test was used for comparisons between subgroups. Results: One hundred patients with relapsed or refractory LBCL were included in the study, and 60 (60%) received corticosteroids for management of toxicities after axi-cel infusion. There was no significant difference in baseline tumor burden, disease stage or international prognostic index between the 2 groups. The median cumulative dexamethasone-equivalent dose was 186 mg (range, 8-1803 mg) and the median duration of corticosteroid treatment was 9 days (range 1-30); 45 (45%) patients started corticosteroid treatment between day 0 and 7, and 15 (15%) beyond day 7. After a median follow-up of 10 months (95% CI 8-10 months), median PFS was 8 months (95% CI, 3-13 months), and use of corticosteroids (any dose) showed a trend for association with shorter PFS (6 vs 9 months, p = 0.13). Use of high-dose corticosteroids (Quartiles (Q) 3-4, 195-1803 mg) significantly associated with shorter PFS (2 vs 9 months, p = 0.005). A trend for shorter PFS was observed among patients receiving corticosteroids for a prolonged time (Q3-Q4, 10-30 days) (5 vs 8 months, p = 0.12) and among patients starting corticosteroids within the first 7 days after axi-cel infusion (6 vs 11 months, p = 0.07). At most recent follow-up, 36 patients died, 28 of progression. Median overall survival has not been reached, and was significantly shorter among patients who received corticosteroids (13 vs not reached, p = 0.006). Conclusions: Early and prolonged use of high-dose corticosteroids is associated with early progression and death in patients with LBCL treated with axi-cel. Additional evaluation is needed to understand the mechanism underlying this association.

8057 Background: HLH is a rare but serious complication of chimeric antigen receptor (CAR) T cell therapy, characterized by severe immune activation, and immune mediated multi-organ failure. Diagnosis is difficult in the context of cytokine release syndrome (CRS) and optimal treatment and outcomes are unclear. Methods: Retrospective, descriptive analysis of patients with relapsed/refractory LBCL treated with SOC axi-cel at MD Anderson Cancer Center between 01/2018 - 10/2019 (data cut-off 12/21/2019). Progression-free survival (PFS) defined as time from axi-cel infusion to progression/death or last follow-up. Diagnosis of HLH per HLH-2004 and CART cell therapy toxicity guidelines (Neelapu, 2018) Results: One hundred and five patients with relapsed/refractory LBCL included, 6 diagnosed with HLH. No significant difference in baseline characteristics, disease stage, international prognostic index or inflammatory markers at baseline between groups, with exception of platelet count which was lower in HLH group 116 [37-129] versus 141 [9-391] (p = 0.07). Development of HLH was early after CART cell infusion at a median 11 days [7 – 78 days] with 3 patients having bone marrow hemophagocytosis; all 6 had abnormalities in liver function tests, fibrinogen, triglycerides, and at least 1 ferritin level > 10,000. CART toxicity in HLH cohort: 4 patients experienced grade 0-1 CRS, and 1 with grade 2 CRS while 3 HLH patients experienced grade 3-4 IEC-associated neurotoxicity syndrome ( ICANS), and 2 patients had grade 0-1 ICANS. Five HLH patients treated with high dose steroids, and tocilizumab; anakinra administered in 2 patients. Four of 6 patients had resolution of HLH with treatment and didn’t require escalation to HLH specific therapy however 1 patient was treated with steroids/etoposide. PFS and overall survival (OS) were significantly shorter in HLH group, PFS 1 months vs 8 months, respectively (p < 0.001) and median OS 2 months vs not reached, respectively (p = 0.001) follow up 10 months (95% CI 8-12 months). One patient died of acute respiratory failure, 2 patients died of HLH and multi-organ failure without progressive disease (PD). Of 3 remaining patients, all had radiographic PD at day 30, 2 of whom died of PD. Conclusions: HLH is likely an underreported complication of CART cell therapy, and patients with HLH have significantly worse outcomes. In this series the majority of patients died of PD, not the syndrome itself. More information is necessary to design treatment strategies that won’t compromise CART outcomes.

Introduction: Patients with common inherited bleeding disorders (IBDs) including hemophilia and von Willebrand disease (VWD) are at risk of coronary artery disease (CAD) as they age, albeit lower than the general population. Intuitively, these patients would appear to have a higher mortality rate given an increased risk of hemorrhagic complications and/or possibly cardiovascular complications from undertreatment with antithrombotic agents and/or procedures. Methods: Data from National Hospital Discharge Survey (NHDS) from 2001-2010 were analyzed using diagnosis codes (ICD 9) to identify patients with hemophilia, VWD and myocardial infarction (MI). Demographics and discharge information were compared amongst patients who had an MI with and without these coagulopathies, using chi-squared tests, Fisher's exact tests, and linear regressions. All tests were adjusted for survey design with sampling weights. Yearly rates of MI were compared between patients with and without these coagulopathies. All analyses were performed in STATA 12.0. Results: During the years 2001-2010, about 0.2 million patients (weighted data) were discharged with IBD i.e. hemophilia and VWD. Among them, the incidence of MI was 0.26% in hemophilia and 1.61% in VWD patients. Hemophilia patients were more likely to be men (76.9% vs 56.2%) and Caucasians (66% vs 65%) while VWD patients were more likely to be younger (67 vs 69 years), women (52% vs 44%) and Caucasians (66% vs 65%) compared to the normal population (all p-values Compared to non-bleeding disorder patients, the patients with VWD and hemophilia had shorter duration of hospital stay and lower in-hospital mortality compared to normal population. Furthermore, VWD patients were less likely to undergo coronary artery bypass graft (CABG) (2.0% vs 30.4%), coronary angiogram (14.5% vs 29.5%) and systemic thrombolysis (0.0% vs 1.1%) for the treatment of MI whereas patients with hemophilia are less likely to undergo CABG (11.1% vs 30.4%) but more likely to undergo coronary angiogram (41.2% vs 29.5%) (all p-values On the other hand, hemophilia patients with MI had a higher prevalence of the following complications: cardiogenic shock (26% vs 2.3%), pneumonia (32.9% vs 8.2%), respiratory failure (25.9% vs 9%) and intubation (25.9% vs 7%) compared to MI patients without hemophilia (all p-values Conclusion: Although patients with coagulopathic disorders are historically thought to have a lower risk of MI, they can be at an increased risk of complications. But, nonetheless, they have a lower risk of in-hospital mortality which may be due to the putative protective effect of lower levels of FVIII/IX or VWF. These patients, in general, are less likely to receive therapeutic interventions. Further prospective study is needed in order to confirm and better understand the discordance of a lower in-patient mortality in inherited bleeding disorder patients despite a decrease in some cardiac interventions and an increase in some non-cardiac complications Disclosures No relevant conflicts of interest to declare.

Introduction: Fecal microbiota transplant (FMT) has been shown to be an effective treatment for recurrent Clostridioides difficile infection (CDI). Immunosuppression is one of the risk factors for CDI. However, most of the trials evaluating efficacy of FMT have excluded immunocompromised patients. Patients with hematological cancers represent a major class of immunocompromised patients. Hence, we performed a meta-analysis to evaluate the efficacy of FMT in patients with hematological cancer for the treatment of recurrent CDI. Methods: A systematic search of Medline, Embase, and Web of Science was performed from January 2000 up to December 2018. Articles included for meta-analysis were case series and case reports that assessed efficacy of FMT in hematological cancer patients were included. Study quality was assessed using the Newcastle-Ottawa scale. The main outcomes were pooled proportions of patients achieving cure after first FMT. The cure rate was defined as resolution of diarrhea without any recurrence. Results: 10 studies (5 case series and 5 case reports) were included in the analysis, making up 29 patients who underwent 38 total FMT procedures. The follow up period ranged from 1- 14 months. Of the included patients, 17 had leukemia, 10 had lymphoma and 2 patients had multiple myeloma and myelodysplastic syndrome each. 7 of these patients had undergone hematopoietic stem cell transplant. The pooled cure rate was 82% [confidence interval (CI) 67-94%] after 1 FMT with no heterogeneity (I2=0%). Minor publication bias was seen on visual inspection of funnel plot. FMT was generally well tolerated by these patients. No serious side effects were reported in any study. One of the studies reported death due to cardiac arrest 5 days after FMT which was thought to be unrelated to the procedure. Mild side effects including mild abdominal pain, transient diarrhea, fecal urgency, constipation and nausea were reported in 5 patients. Conclusion: Based on limited observational data, FMT seems to be an effective and safe modality for management of recurrent CDI in patients with hematological cancers. However, further prospective clinical trials are needed to establish its safety as a first line therapy for recurrent CDI in this population. Figure Disclosures Jamshed: Takeda Pharmaceutical: Honoraria. Khanna:Rebiotix, Inc: Research Funding; Probio Tech, LLC: Consultancy; Facile Therapeutics: Consultancy; Shire, Plc: Consultancy.

e19530 Background: Renal impairment (RI) in Multiple Myeloma (MM) adversely affects the prognosis. Removing circulating free light chains via hemodialysis (HD) or plasma exchange (PLEX) along with chemotherapy can improve renal outcomes in MM. Methods: Per PRISMA guidelines a systematic search yielded 7311 articles since 2009 on 4 databases. After screening, 16 studies were included. Results: Main modalities were high cut off (HCO) HD, high flux (HF) HD, conventional HD and PLEX. N = 541 patients underwent HD/PLEX. 375/541 (69.3%) patients received HCO HD. In 2 RCTs, there was no significant difference in renal recovery (55.8% vs 51.6%; 41% vs 33%). The overall survival (OS) between the 2 groups was lower in the HCO group vs conventional HD (55.8% vs 76.6%) at 2 years while there was no significant difference in second study. Conclusions: HCO has failed to show promising efficacy with 2 RCTs failing to show statistical OS difference. There is paucity of data and further trials are needed. [Table: see text]

e18244 Background: Clostridioides difficile infection (CDI) has higher incidence in cancer patients. To characterize the extent of CDI burden among hematologic cancer patients, we used the National Hospital Discharge Survey (NHDS) to report the incidence and outcomes of CDI. Methods: NHDS data from 2001-2010 were analyzed using diagnosis codes to identify patients with hematologic cancers and CDI. Demographics and discharge information were compared amongst hematologic cancer patients with and without CDI. Logistic regression models were runto estimate the impact of CDI on hematologic cancer patient outcomes, using STATA 12.0. Results: During the years 2001-2010, about 3.7 million patients (weighted data) were discharged with hematologic cancer. Among them, the incidence of CDI was 2.3%. Hematologic cancer patients with CDI were younger (mean age 66 vs 68 years), more likely to be men (66% vs 64.5%), to be of white race (68.1% vs 67.7%) and to have emergent admissions (73% vs 69%), all p values < 0.001. CDI incidence in these patients showed a steeper increase than non-cancer patients, with highest incidence in 2008-2009. Hematologic cancer patients with CDI had a longer mean Length of stay (16.9 vs 7.1 days; adjusted odds ratio (aOR) 9.5, 95% CI 9.4-9.6), all cause hospital mortality (11.3% vs 6.3%; aOR 1.92, 95% CI 1.88-1.97) and discharge to a care facility (28.4% vs 18.8%; aOR 2.06, 95% CI 2.02-2.10) compared to non-CDI cancer patients. Conclusions: CDI incidence is higher in patients with hematologic malignancy. They also have worse outcomes including overall mortality, longer hospitalizations and discharge to healthcare facility. These patients warrant closer screening and prompt treatment of CDI as they are at greater risk of unfavorable outcomes. [Table: see text]

Introduction: C. difficile infection (CDI) is a common nosocomial infection. Immune suppression is thought to be a major risk factor for CDI. Hematopoietic stem cell transplant (HSCT) recipients represent a major subgroup of immunologically vulnerable patients. It is unclear if these patients have novel risk factors for CDI development. We, therefore, performed a systematic review and meta-analysis to evaluate the predictors of CDI in HSCT recipients. Methods: A systematic search of Medline, Embase, and Web of Science was performed from January 2000 up to June 2018. All studies that assessed risk factors associated with CDI development in HSCT recipients were eligible for inclusion. Data on clinical characteristics and risk factors associated with CDI development were collected. Study quality was assessed using the Newcastle-Ottawa scale. Meta-analyses were performed using random effects models and pooled odds ratios with 95% confidence interval (CI) for risk factors reported in ≥ 2 studies were calculated. Results: Overall, 17 studies, including 6328 HSCT patients were included. Of those 874 patients developed CDI. The rate of CDI development in these patients was 13.81% with a follow up ranging from 1- 36 months. A total of 34 different risk factors were studied, of which 20 were identified in ≥ 2 studies. Our analysis showed that cephalosporin use (Odds ratio [OR] 2.21, 95% confidence interval [CI] 1.26-3.87), cord blood transplant (OR 1.36, 95% CI 1.01-1.83), graft versus host disease (GVHD) (OR 1.63, 95% CI 1.07-2.48) & prior hospitalization within 90 days of HSCT (OR 1.85, 95% CI 1.21-2.83) were associated with statistically significant increased risk of CDI in HSCT patients (Figure 1). On the other hand, many characteristics of HSCT patients including age, diabetes, lung disease, fluoroquinolones, proton pump inhibitors, rituximab, mucositis, myeloablative therapy, melphalan use before BMT, total body irradiation, growth factor use during admission, neutropenia, autologous vs allogenic transplant and use of matched related donor were not associated with increased risk of CDI. Conclusion: HSCT recipients are at an increased risk of CDI compared to general population. In addition to the common risk factors like cephalosporin use and prior hospitalization, these patients have novel characteristics including presence of GVHD and cord blood transplant that puts them at a higher risk of CDI. HSCT patients with these risk factors may warrant a closer surveillance for early detection and treatment of CDI. Table 1. Table 1. Disclosures No relevant conflicts of interest to declare.