scholarly journals Adjusted Comparisons Suggest Daratumumab Is Associated with Prolonged Survival Compared with Standard of Care Therapies in Patients with Heavily Pre-Treated and Highly Refractory Multiple Myeloma

Blood ◽  
2016 ◽  
Vol 128 (22) ◽  
pp. 4517-4517 ◽  
Author(s):  
Shaji K. Kumar ◽  
Brian G M Durie ◽  
Zhuo Su ◽  
Joris Diels ◽  
Brian Hutton ◽  
...  
Keyword(s):  
Multiple Myeloma ◽  
Propensity Score ◽  
Real World ◽  
Research Funding ◽  
Statistical Significance ◽  
Standard Of Care ◽  
Regression Analyses ◽  
Refractory Multiple Myeloma ◽  
Refractory Status ◽  
Equity Ownership

Abstract Objective: To fully contextualize the benefit of novel agents such as daratumumab (DARA) monotherapy for the treatment of patients with heavily pre-treated and highly refractory multiple myeloma (MM), it is critical to understand the real-world outcomes of this patient population on current standard of care (SOC) therapies. The objective of this study was to perform adjusted comparisons to determine the comparative effectiveness of DARA monotherapy versus real-world SOC therapies. Methods: Data for patients treated with DARA 16 mg/kg monotherapy were available from clinical trials MMY2002 (n=106) and GEN501 (n=42), while patients treated with SOC therapies were derived from the International Myeloma Foundation (IMF) chart review of patients with MM who had ≥3 prior lines of therapy and were double refractory to a proteasome inhibitor (PI) and an immunomodulatory drug (IMiD) (n=543) (Kumar et al., ASH 2016; submitted). The pooled DARA studies demonstrated a median overall survival (OS) of 20.1 months versus 13.0 months for SOC based on the IMF cohort (Usmani et al., Blood 2016; Kumar et al., ASH 2016; submitted). The relative treatment effect of DARA versus SOC was estimated using two adjusted comparison methodologies, propensity score matching (PSM) and multivariate Cox regression analyses. Both methodologies utilized individual patient data to compare OS. Modeled covariates for the PSM were age, gender, prior lines of therapy, albumin, and refractory status to bortezomib (BOR), carfilzomib (CAR), lenalidomide (LEN), and pomalidomide (POM). PSM was performed using caliper matching with a caliper width 25% of the standard deviation of the logit-transformed propensity score, using sampling without replacement. For the regression analysis, the covariates included in the multivariate proportional hazards regression model were age, gender, prior lines of therapy, albumin, beta-2 microglobulin, prior exposure to POM and CAR, and PI/IMiD refractory status. Clustering of observations at the treatment-line level within patients was controlled for using the robust sandwich estimate for the covariance matrix, making confidence intervals (CIs) more conservative. For both PSM and regression, statistical significance testing was performed using a two-tailed p-value of <0.05, and all comparisons between treatment groups were reported with hazard ratios (HRs) and 95% CIs. Results: Prior to PSM, imbalances between the DARA and SOC groups were significant for prior lines of therapy and proportions of patients refractory to POM, CAR, BOR, and LEN. After PSM, the DARA and SOC groups were well balanced for all covariates included in propensity score calculations. After PSM, comparisons found significant improvement in favor of DARA relative to SOC for OS (HR=0.44 [95% CI 0.31-0.63]) (Figure 1). Regression analyses revealed consistent results. After adjustment for differences in all covariates included in regression between the DARA and SOC groups, results showed significant improvement in favor of DARA compared with SOC for OS (HR=0.43 [95% CI 0.32-0.59]) (Figure 2). Conclusions: Findings from both PSM and regression analyses were consistent and suggest that DARA is associated with significant gains in OS compared with SOC therapies for patients with heavily pre-treated and highly refractory MM. References: 1. Usmani SZ, Weiss BM, Plesner T, Bahlis NJ, Belch A et al. (2016) Clinical efficacy of daratumumab monotherapy in patients with heavily pretreated relapsed or refractory multiple myeloma. Blood 128 (1): 37-44. 2. Kumar SK, et al. (2016) Natural history of relapsed myeloma, refractory to immunomodulatory drugs and proteasome inhibitors: a multicenter IMWG study. The 58th Annual Meeting of the American Society of Hematology: submitted. Disclosures Kumar: Celgene: Consultancy, Research Funding; Noxxon: Consultancy, Honoraria; Janssen: Research Funding; AbbVie: Research Funding; BMS: Consultancy; Amgen: Consultancy, Research Funding; Takeda: Consultancy, Research Funding; Sanofi: Consultancy, Research Funding; Skyline: Consultancy, Honoraria. Durie:Amgen: Consultancy; Takeda: Consultancy; Janssen: Consultancy. Su:Janssen: Research Funding. Diels:Johnson & Johnson: Employment, Equity Ownership. Hutton:Essai Canada: Consultancy; Cornerstone Research Group: Consultancy; Janssen: Research Funding. Lam:Janssen: Employment. Tetsuro:Johnson & Johnson: Equity Ownership; Janssen: Employment.

scholarly journals Dreamm-3: A Phase 3, Open-Label, Randomized Study to Evaluate the Efficacy and Safety of Belantamab Mafodotin (GSK2857916) Monotherapy Compared with Pomalidomide Plus Low-Dose Dexamethasone (Pom/Dex) in Participants with Relapsed/Refractory Multiple Myeloma (RRMM)

Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 1900-1900 ◽  
Author(s):  
Katja Weisel ◽  
Thomas G Hopkins ◽  
Doug Fecteau ◽  
Weichao Bao ◽  
Corinne Quigley ◽  
...  
Keyword(s):  
Multiple Myeloma ◽  
Monoclonal Antibody ◽  
Research Funding ◽  
Standard Of Care ◽  
Efficacy And Safety ◽  
Open Label ◽  
Employment Equity ◽  
Phase 3 ◽  
Refractory Multiple Myeloma ◽  
Equity Ownership

Background: Belantamab mafodotin is a humanized, afucosylated, anti-B-cell maturation antigen (BCMA) monoclonal antibody conjugated to monomethyl auristatin F via a maleimidocaproyl linker (mcMMAF). Upon binding to BCMA on the surface of plasma cells, it is rapidly internalized and the cytotoxic moiety (cys-mcMMAF) is released, antibody-dependent cellular cytotoxicity is enhanced, and immunogenic cell death occurs. In vitro and in vivo cytotoxic activity against both myeloma cell lines and primary patient cells has been demonstrated in preclinical studies. In the first-in-human phase 1 study (DREAMM-1/BMA117159, NCT02064387), belantamab mafodotin had a manageable safety profile and demonstrated a rapid, deep, and durable clinical response as a monotherapy in patients with relapsed/refractory multiple myeloma (RRMM). In a cohort of 35 heavily pretreated patients with RRMM (57% with ≥5 lines of prior therapy) who received belantamab mafodotin 3.4 mg/kg by intravenous (IV) infusion every 3 weeks (Q3W) overall response rate (ORR) of 60% (95% confidence interval [CI]: 42.1, 76.1) was demonstrated. The median progression-free survival (PFS) was 12.0 months (95% CI: 3.1, not estimable [NE]) and the median duration of response (DoR) was 14.3 months (95% CI: 10.6, NE). Belantamab mafodotin monotherapy in patients with RRMM is being further evaluated against the standard-of-care pomalidomide/dexamethasone (Pom/Dex) regimen in the DREAMM-3 study. Methods: The phase 3, multicenter, randomized, open-label DREAMM-3 study will evaluate the efficacy and safety of belantamab mafodotin monotherapy compared with Pom/Dex, an established standard-of-care regimen in RRMM. In this global study, patients treated with ≥2 prior lines of therapy, including ≥2 consecutive cycles of both lenalidomide and a proteasome inhibitor, and refractory to the last line of treatment, will be eligible for inclusion. Participants with prior allogeneic transplant will be excluded, as will those with prior exposure to BCMA-targeted therapies and Pom. Approximately 320 participants will be randomized (2:1) to receive either belantamab mafodotin or Pom/Dex and will be stratified by age, exposure to anti-CD38 therapy, and number of prior lines of treatment. Belantamab mafodotin will be administered IV Q3W, at the dose confirmed in the ongoing DREAMM-2 study (NCT03525678). Pom will be administered orally at 4 mg on Days 1-21 of each 28-day cycle, with Dex 40 or 20 mg (depending on age) on Days 1, 8, 15, and 22. Treatment in both arms will continue until progressive disease, unacceptable toxicity, or death. The primary endpoint is PFS, and overall survival is a key secondary endpoint. Additional secondary endpoints include ORR, time to response, minimal residual disease negativity rate (10-5 threshold assessed by next-generation sequencing), DoR, safety, and health-related quality of life. Bone marrow and blood samples will be collected for biomarker research. The study is planned to start in late 2019. Acknowledgments: Editorial assistance was provided by Sarah Hauze, PhD, at Fishawack Indicia Ltd, UK, and funded by GlaxoSmithKline. Study is funded by GlaxoSmithKline (ID: 207495); drug linker technology is licensed from Seattle Genetics; monoclonal antibody is produced using POTELLIGENT Technology licensed from BioWa. Disclosures Weisel: Sanofi: Consultancy, Honoraria, Research Funding; Adaptive Biotech: Consultancy, Honoraria; GSK: Honoraria; Takeda: Consultancy, Honoraria; Janssen: Consultancy, Honoraria, Research Funding; Juno: Consultancy; Bristol-Myers Squibb: Consultancy, Honoraria; Amgen: Consultancy, Honoraria, Research Funding; Celgene: Consultancy, Honoraria, Research Funding. Hopkins:GSK: Employment, Equity Ownership. Fecteau:GSK: Employment, Equity Ownership. Bao:GSK: Employment, Equity Ownership. Quigley:GSK: Employment, Equity Ownership. Jewell:GSK: Employment, Equity Ownership. Nichols:GSK: Employment, Equity Ownership. Opalinska:GSK: Employment, Equity Ownership.

Chromosome 1q Amplification Is Associated with a History of Prior Malignancies Among Patients Newly Diagnosed with Multiple Myeloma

Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 2193-2193
Author(s):  
Elizabeth B Lamont ◽  
Andrew J. Yee ◽  
Stuart L. Goldberg ◽  
Andrew D Norden
Keyword(s):  
Prostate Cancer ◽  
Multiple Myeloma ◽  
Clinical Trials ◽  
Usual Care ◽  
Real World ◽  
Research Funding ◽  
Newly Diagnosed ◽  
History Of ◽  
Equity Ownership ◽  
Prior Malignancy

Background: Over the past 20 years, observational data from usual care clinical oncology settings has been leveraged to inform estimates of cancer treatment-associated benefits and risks among patients not treated on clinical trials. Increasing genomic testing to inform treatment decisions in usual care settings now meaningfully augments traditional observational data, positioning it to provide insights beyond clinical care into tumor biology. We studied patients with newly diagnosed multiple myeloma (MM), comparing cytogenetic test patterns according to history of prior malignancy. Methods: In this retrospective cohort study, we identified 2,380 patients from the COTA real-world database (RWD) who were newly diagnosed with MM in the years 2010-2018. The COTA RWD is a de-identified composite of both abstracted electronic health record and administrative data pertaining to patients receiving their cancer care at one of COTA's clinical oncology practice partners. Among these patients, 1769 (74%) had evidence of MM-associated cytogenetic testing with fluorescent in-situ hybridization (FISH) within the 120 days surrounding their date of diagnosis. The 1,769 patients form the analytic cohort. We compared patients' FISH results for t(4;14), deletion(17p), t(14;16), deletion(13), t(14;20), t(6;14), t(11;14), deletion (1p), and amplification(1q) according to their history of prior malignancy. Results: Within the cohort, 263 prior malignancies were identified in 241 patients (14%, 241/1,769). Two-hundred and twenty-one patients (92%) had one prior malignancy, 28 (7.9%) had two prior malignancies, and one (<1%) had four prior malignancies. The most common prior malignancies were prostate (n=50), breast (n=19), melanoma (n=14), skin (n=13), and cervix (n=6). Amplification of the long arm of chromosome one (amp(1q)) was noted in 31% of patients (75/241) with a prior malignancy vs. 24% of patients (370/1,528) without (chi2 test p=0.02). Overall 25% of patients had amp(1q). No other translocations, amplifications, deletions were associated with prior cancers. A non-parametric test for trend revealed a strong positive association between patients' malignancy count (range 0-4) and amp1q (p<0.01). MM patients with prior lymphomas and prior melanomas also had high rates of amp(1q), though these were not significantly different from patients without these prior malignancies. In a multivariable logistic regression model that adjusted for patient demographic attributes, other known potentially collinear MM poor prognostic factors (i.e., revised ISS stage, IgA sub-type, lambda light chains) and adjusted standard errors for clustering of patients within treatment settings, a history of prostate cancer remained clinically and statistically significantly positively associated with amp(1q) (OR 2.1, 95% CI: 1.9-2.2) as did history of two or more prior malignancies (OR 2.8, 95% CI: 2.3-3.3). Of note, amp(1q) was positively associated with IgA subtype (OR 1.5, 95% CI: 1.3-1.6) and the presence of lambda subtype (OR 1.3, 95%CI: 1.3-1.4). Conclusions: Using RWD, we found that newly diagnosed MM patients with histories of prostate cancer and those with two or more prior malignancies were more likely to have amp(1q), a poor prognostic marker in MM. Gains in 1q have previously been identified among patients with prostate and lymphoid cancers, but to our knowledge this is the first study to identify an association with a prior history of cancer, especially prostate cancer, and amp(1q) in MM. This relationship is worth further exploration of whether there is a common pathway associated with for example risk of prostate cancer and amp(1q) in MM. Clinical trials are less likely to answer this question as patients with prior malignancies are often excluded from enrollment. Overall, the results reported suggest that RWD is an efficient and comparatively inexpensive tool to support research in cancer biology through hypothesis generating and testing analyses of linked real-world phenotypic and genotypic data. Disclosures Lamont: COTA: Employment. Yee:Celgene: Consultancy, Honoraria, Research Funding; Karyopharm: Consultancy; Bristol-Myers Squibb: Consultancy, Research Funding; Takeda: Consultancy; Adaptive: Consultancy; Amgen: Consultancy, Honoraria. Goldberg:Cancer Outcomes Tracking and Analysis (COTA) Inc.: Equity Ownership; COTA: Equity Ownership; Bristol-Myers Squibb: Consultancy. Norden:COTA: Employment, Equity Ownership.

MM-008: A Phase 1 Trial Evaluating Pharmacokinetics and Tolerability of Pomalidomide + Low-Dose Dexamethasone in Patients with Relapsed or Refractory and Refractory Multiple Myeloma and Renal Impairment

Blood ◽  
2014 ◽  
Vol 124 (21) ◽  
pp. 4730-4730 ◽  
Author(s):  
Jeffrey Matous ◽  
David S Siegel ◽  
Sagar Lonial ◽  
R. Donald Harvey ◽  
Claudia Kasserra ◽  
...  
Keyword(s):  
Multiple Myeloma ◽  
Renal Impairment ◽  
Creatinine Clearance ◽  
Research Funding ◽  
Platelet Transfusion ◽  
Low Dose ◽  
Phase 1 ◽  
Employment Equity ◽  
Refractory Multiple Myeloma ◽  
Equity Ownership

Abstract Background: Pomalidomide (POM) is indicated for patients (pts) with relapsed or refractory multiple myeloma (RRMM) who received ≥ 2 prior therapies including lenalidomide and bortezomib and demonstrated progression on or within 60 days of completion of the last treatment (Tx). Renal impairment (RI) is a common comorbidity of multiple myeloma (MM) occurring in 20% to 40% of pts (Eleutherakis-Papaikovou, et al. Leuk Lymphom, 2007; Knudsen, et al., Eur J Haematol, 2000). POM is extensively metabolized, with < 5% eliminated renally as the parent drug (Hoffmann, et al., Cancer Chemother Pharmacol, 2013). POM in combination with low-dose dexamethasone (LoDEX) has shown efficacy in pts with RRMM and moderate RI (creatinine clearance [CrCl] < 30-44 mL/min), but pts with severe RI (CrCl < 30 mL/min; serum creatinine> 3 mg/dL) were excluded from most trials (Siegel, et al., Blood. 2012; Weisel, et al., J Clin Oncol, 2013). MM-008 is a multicenter, open-label, phase 1 study assessing the pharmacokinetics (PK) and safety of POM + LoDEX in pts with RRMM and normal or severely impaired renal function. Methods: Pts withRRMM (≥ 1 prior Tx) and normal kidney function or mild RI (creatinine clearance [CrCl] ≥ 60 mL/min; Cohort A—control arm), severe RI (CrCl < 30 mL/min) not requiring dialysis (Cohort B), and severe RI requiring dialysis (Cohort C) were eligible. Cohort A received POM 4 mg, and Cohort B received POM 2 or 4 mg on days 1-21 of a 28-day cycle, following a 3 + 3 dose-escalation design. Cohort B results informed the 4 mg dosing of Cohort C. All cohorts received DEX 40 mg (20 mg for pts aged > 75 yrs) on days 1, 8, 15, and 22. Tx continued until progression or unacceptable toxicity. Dose-limiting toxicities (DLTs) were defined as any of the following: grade (Gr) 4 neutropenia, febrile neutropenia, Gr 4 thrombocytopenia that is a ≥ 30% decrease in platelets from baseline and requires > 1 platelet transfusion, Gr 3 thrombocytopenia with significant bleeding (requiring hospitalization and/or platelet transfusion), Gr 4 infection, or ≥ Gr 3 other non-hematologic toxicity related to POM. Serial plasma samples were analyzed to generate PK parameters. Updated PK and AE data for all cohorts will be presented. Results: As of July 17, 2014, updated data for 16 treated pts were available (8 in Cohort A; 3 in Cohort B at 2 mg; 4 in Cohort B at 4 mg; and 1 in Cohort C). Median age was 67 yrs (range, 46-76 yrs), 56% were male, all had Eastern Cooperative Oncology Group performance status 0 or 1, and a median time from diagnosis of 3.8 yrs (range, 0.6-12.5). No DLTs in cycle 1 were reported for any cohort. The most common Gr ≥ 3 adverse events (AEs) were neutropenia, anemia, infection, and fatigue (Table). Median relative dose intensity was consistent across cohorts: 90% (Cohort A), 90% (Cohort B; 2 mg), 100% (Cohort B; 4 mg) and 100% (Cohort C). Three pts discontinued due to AEs (2 in Cohort A and 1 in Cohort B 4 mg); no deaths have occurred during treatment phase. Conclusion: MM-008 is an ongoing trial prospectively evaluating the PK and safety of POM + LoDEX in pts with RRMM and severe RI. Preliminary PK data support mean dose-normalized exposure in pts with RRMM being similar between those with severe RI and those with no or mild RI at the clinical dose of 4 mg; early tolerability data (after one cycle) are encouraging. Table Cohort A(n = 8) Cohort B(n = 3) Cohort B(n = 4) Cohort C(n = 1) Cohort Characteristics POM dose 4 mg 2 mg 4 mg 4 mg CrCl (mL/min) ≥ 60 mL/min < 30 mL/min without dialysis < 30 mL/min without dialysis < 30 mL/min with dialysis Safety Dose-limiting toxicities (n) N/A 0 0 0 Grade 3/4 AEs (n) Neutropenia 4 2 1 0 Anemia 3 1 2 0 Infection 3 2 0 0 Fatigue 2 0 0 0 N/A: Not applicable (4 mg POM is approved dose for population) Disclosures Matous: Celgene Corp: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau. Siegel:Celgene Corp: Honoraria, Speakers Bureau; Onyx: Honoraria, Speakers Bureau; Millennium: Honoraria, Speakers Bureau. Lonial:Onyx: Consultancy; BMS: Consultancy; Novartis: Consultancy; Celgene: Consultancy; Millennium: Consultancy. Harvey:Celgene Corp: Research Funding. Kasserra:Celgene Corp: Employment, Equity Ownership. Li:Celgene Corp: Employment, Equity Ownership. Chen:Celgene Corp: Employment. Doerr:Celgene Corporation: Employment. Sternas:Celgene Corp: Employment, Equity Ownership. Zaki:Celgene : Employment, Equity Ownership. Jacques:Celgene Corp: Employment, Equity Ownership. Shah:Celgene Corp: Consultancy, Research Funding.

scholarly journals Real-World Outcomes for Standard-of-Care Treatments in Patients with Relapsed/Refractory Multiple Myeloma

Blood ◽  
2021 ◽  
Vol 138 (Supplement 1) ◽  
pp. 4075-4075
Author(s):  
Michel Delforge ◽  
Marie-Christiane Vekemans ◽  
Sébastien Anguille ◽  
Julien Depaus ◽  
Nathalie Meuleman ◽  
...  
Keyword(s):  
Multiple Myeloma ◽  
Board Of Directors ◽  
Real World ◽  
Research Funding ◽  
Retrospective Chart Review ◽  
Standard Of Care ◽  
Real World Data ◽  
Advisory Committees ◽  
Treatment Regimens

Abstract Background: With the advent of immunomodulatory agents (IMiDs), proteasome inhibitors (PIs) and, more recently, anti-CD38 monoclonal antibodies (mAbs), prognosis of patients with multiple myeloma (MM) has improved considerably. Unfortunately, even with these 3 major MM drug classes, most patients ultimately relapse and require further therapy. There remains an incomplete understanding of how patients who have received extensive therapy and with relapsed/refractory multiple myeloma (RRMM) are treated in routine clinical practice, as no standard-of-care exists for these patients, and what the outcomes are in this real-world setting. Objective: This study aims to evaluate the outcomes of patients with triple-class (IMiD, PI and anti-CD38 mAb) and triple-line exposed RRMM using real-world data from patients in Belgium. Methods: A multicenter, observational study, involving 7 non-academic and academic Belgian centers, was conducted based on a retrospective chart review of adult RRMM patients who started subsequent treatment from March 2017 through May 2021 after having received ≥3 lines of therapy including at least an IMiD, a PI, and anti-CD38-directed therapy (tri-exposed). Data were captured in an electronic case report form (Castor EDC). Patients with an ECOG performance status of ≥2, who received prior CAR-T treatment or prior BCMA-targeted therapy, or with a known active or prior history of CNS involvement (or with clinical signs thereof), were excluded. All treatment lines initiated after becoming eligible were used in the analysis. Specifically, all treatment lines for patients meeting the eligibility criteria more than once in their entire follow-up were included as separate observations, with date of treatment initiation as specific baseline for each treatment line. Cox proportional hazards models were fitted to explore the prognostic value with Overall Survival (OS), Progression Free Survival (PFS), and Time to Next Therapy (TTNT). Results: A total of 112 patients with 237 eligible treatment lines were included in the analysis; median follow-up was 16.6 months. In 45% of the initiated treatment lines, patients were refractory to 4 or 5 therapies, 62% had received ≥5 prior lines, 22% had extramedullary disease and in 48% of observations the time to progression in prior line was shorter than 4 months. After patients became tri-exposed, more than 50 unique treatment regimens were initiated, with the following being the most common: carfilzomib + dexamethasone (14%), pomalidomide + dexamethasone + chemotherapy (8%), and ixazomib + lenalidomide + dexamethasone (6%). Additionally, 4% of included observations were exposed to anti-BCMA agents. Overall, the following treatment classes were the most frequently started: PI only (19%), PI + IMiD combinations (17%), and regimens including anti-CD38 antibodies (15%). Median OS was 9.79 months [95% CI: 7.79; 12.22], median PFS was 3.42 months [95% CI: 2.79; 4.27], median TTNT was 3.61 months [95% CI: 3.09; 4.57]. Higher refractory status (p&lt;0.001), being male (p=0.001), older age (p&lt;0.001), shorter duration of prior lines (p&lt;0.001), shorter time to progression in prior line (p=0.025), and higher LDH levels (p&lt;0.002) were prognostic for worse outcomes for both OS (Figure 1) and PFS. Conclusions: This retrospective chart review of patients with tri-exposed RRMM in Belgium shows that real-world outcomes in terms of OS, PFS and TTNT are poor for these patients, with a median OS of &lt;10 months. A wide variety of treatment regimens used in clinical practice confirm the absence of a clear standard-of-care in this patient population. The literature also confirms that these poor outcomes observed in Belgium, for this subset of MM patients, are similar in other countries. These real-world data highlight the high unmet medical need in this patient population and critical need for new and effective treatment options. MD and MCV contributed equally to this work. Figure 1 Figure 1. Disclosures Delforge: Amgen, Celgene, Janssen, Sanofi: Honoraria, Research Funding. Vekemans: Amgen: Membership on an entity's Board of Directors or advisory committees; Takeda: Membership on an entity's Board of Directors or advisory committees; BMS-Celgene: Membership on an entity's Board of Directors or advisory committees, Research Funding; Janssen Pharmaceutica: Membership on an entity's Board of Directors or advisory committees, Research Funding; Sanofi: Membership on an entity's Board of Directors or advisory committees. Depaus: Takeda: Consultancy; Novartis: Consultancy; Janssen: Consultancy; Celgene: Consultancy. Meuleman: iTeos Therapeutics: Consultancy. Strens: Realidad bvba: Consultancy. Van Hoorenbeeck: Janssen: Current Employment. Moorkens: Janssen-Cilag: Current Employment. Diels: Janssen: Current Employment. Ghilotti: Janssen-Cilag SpA, Cologno Monzese, Italy: Current Employment. Dalhuisen: Janssen: Current Employment. Vandervennet: Janssen: Current Employment.

scholarly journals Prognostic Molecular Stratification in Relapsed/Refractory Multiple Myeloma - Results of the Pomalidomide Mukseven (NCT02406222) Biomarker Trial

Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 4327-4327
Author(s):  
James Croft ◽  
Andrew Hall ◽  
Amy L Sherborne ◽  
Katrina Walker ◽  
Sidra Ellis ◽  
...  
Keyword(s):  
Multiple Myeloma ◽  
Flow Cytometry ◽  
T Cell ◽  
High Risk ◽  
Real World ◽  
Research Funding ◽  
Unmet Need ◽  
Employment Equity ◽  
Equity Ownership

Background Treatment of relapsed/refractory multiple myeloma (RRMM) remains challenging as durable remissions are achieved in patient sub-groups only. Identifying patients that are likely to benefit prior to or early after starting relapse treatments remains an unmet need. MUKseven is a trial specifically designed to investigate and validate biomarkers for treatment optimization in a 'real-world' RRMM population. Design In the randomized multi-center phase 2 MUKseven trial, RRMM patients (≥2 prior lines of therapy, exposed to proteasome inhibitor and lenalidomide) were randomized 1:1 to cyclophosphamide (500 mg po d1, 8, 15), pomalidomide (4 mg days 1-21) and dexamethasone (40 mg; if ≥75 years 20 mg; d1, 8, 15, 21) (CPomD) or PomD and treated until progression. All patients were asked to undergo bone marrow (BM) and peripheral blood (PB) bio-sampling at baseline, cycle 1 day 14 (C1D14, on-treatment) and relapse. For biomarker discovery and validation, IGH translocations were profiled by qRT-PCR, copy number aberrations by digital MLPA (probemix D006; MRC Holland), GEP by U133plus2.0 array (Affymetrix), PD protein markers by IHC and PB T-cell subsets by flow cytometry for all patients with sufficient material. Primary endpoint was PFS, secondary endpoints included response, OS, safety/toxicity and biomarker validation. Original planned sample size was 250 patients but due to a change in UK standard of care during recruitment with pomalidomide becoming available, a decision was made to stop recruitment early. Results In total, 102 RRMM patients were randomized 1:1 between March 2016 and February 2018. Trial entry criteria were designed to include a real-world RRMM population, permitting transfusions and growth factor support. Median age at randomization was 69 years (range 42-88), 28% of patients had received ≥5 prior lines of therapy (median: 3). Median follow-up for this analysis was 13.4 months (95% CI: 12.0-17.5). 16 patients remained on trial at time of analysis (median number of cycles: 19.5; range 8-28). More patients achieved ≥PR with CPomD compared to PomD: 70.6% (95% CI: 56.2-82.5%) vs. 47.1% (CI: 32.9-61.5%) (P=0.006). Median PFS was 6.9 months (CI: 5.7-10.4) for CPomD vs. 4.6 months (CI: 3.5-7.4) for PomD, which was not significantly different as per pre-defined criteria. Follow-up for OS is ongoing and will be presented at the conference. High-risk genetic aberrations were found at following frequencies: t(4;14): 6%, t(14;16)/t(14;20): 2%, gain(1q): 45%, del(17p): 13%. Non-high risk lesions were present as follows: t(11;14): 22%, hyperdiploidy: 44%. Complete information on all high-risk genetic markers was available for 71/102 patients, of whom 12.7% had double-hit high-risk (≥2 adverse lesions), 46.5% single-hit high-risk (1 adverse lesion) and 40.8% no risk markers, as per our recent meta-analysis in NDMM (Shah V, et al., Leukemia 2018). Median PFS was significantly shorter for double-hit: 3.4 months (CI: 1.0-4.9) vs. single-hit: 5.8 months (CI: 3.7-9.0) or no hit: 14.1 months (CI: 6.9-17.3) (P=0.005) (Figure 1A). GEP was available for 48 patients and the EMC92 high-risk signature, present in 19% of tumors, was associated with significantly shorter PFS: 3.4 months (CI: 2.0-5.7) vs. 7.4 (CI: 3.9-15.1) for EMC92 standard risk (P=0.037). Pharmacodynamic (PD) profiling of cereblon and CRL4CRBN ubiquitination targets (including Aiolos, ZFP91) in BM clots collected at baseline and C1D14 is currently ongoing. Preliminary results for the first 10 patients demonstrate differential change of nuclear Aiolos (Figure 1C), with a major decrease in Aiolos H-scores in 7/10 patients from baseline to C1D14 and reconstitution at relapse. T-cell PB sub-sets were profiled at baseline and C1D14 by flow cytometry. Specific sub-sets increased with therapy from baseline to C1D14, e.g. activated (HLA-DR+) CD4+ T-cells, as reported at last ASH. CD4+ T-cell % at baseline was associated with shorter PFS in these analyses in a multi-variable Cox regression model (P=0.005). PD and T-cell biomarker results will be updated and integrated with molecular tumor characteristics and outcome. Discussion Our results demonstrate that molecular markers validated for NDMM predict treatment outcomes in RRMM, opening the potential for stratified delivery of novel treatment approaches for patients with a particularly high unmet need. Additional immunologic and PD biomarkers are currently being explored. Disclosures Croft: Celgene: Other: Travel expenses. Hall:Celgene, Amgen, Janssen, Karyopharm: Other: Research funding to Institution. Walker:Janssen, Celgene: Other: Research funding to Institution. Pawlyn:Amgen, Janssen, Celgene, Takeda: Other: Travel expenses; Amgen, Celgene, Janssen, Oncopeptides: Honoraria; Amgen, Celgene, Takeda: Consultancy. Flanagan:Amgen, Celgene, Janssen, Karyopharm: Other: Research funding to Institution. Garg:Janssen, Takeda, Novartis: Other: Travel expenses; Novartis, Janssen: Research Funding; Janssen: Honoraria. Couto:Celgene Corporation: Employment, Equity Ownership, Patents & Royalties. Wang:Celgene Corporation: Employment, Equity Ownership. Boyd:Novartis: Consultancy, Honoraria; Janssen: Consultancy, Honoraria; Takeda: Consultancy, Honoraria; Amgen: Consultancy, Honoraria; Celgene: Consultancy, Honoraria. Pierceall:Celgene: Employment. Thakurta:Celgene: Employment, Equity Ownership. Cook:Celgene, Janssen-Cilag, Takeda: Honoraria, Research Funding; Janssen, Takeda, Sanofi, Karyopharm, Celgene: Consultancy, Honoraria, Speakers Bureau; Amgen, Bristol-Myers Squib, GlycoMimetics, Seattle Genetics, Sanofi: Honoraria. Brown:Amgen, Celgene, Janssen, Karyopharm: Other: Research funding to Institution. Kaiser:Takeda, Janssen, Celgene, Amgen: Honoraria, Other: Travel Expenses; Celgene, Janssen: Research Funding; Abbvie, Celgene, Takeda, Janssen, Amgen, Abbvie, Karyopharm: Consultancy.

scholarly journals Efficacy of Daratumumab, Lenalidomide and Dexamethasone Versus Lenalidomide and Dexamethasone Alone for Relapsed or Refractory Multiple Myeloma Among Patients with 1 to 3 Prior Lines of Therapy Based on Previous Treatment Exposure: Updated Analysis of Pollux

Blood ◽  
2016 ◽  
Vol 128 (22) ◽  
pp. 489-489 ◽  
Author(s):  
Philippe Moreau ◽  
Jonathan L. Kaufman ◽  
Heather J. Sutherland ◽  
Marc Lalancette ◽  
Hila Magen ◽  
...  
Keyword(s):  
Multiple Myeloma ◽  
Board Of Directors ◽  
Research Funding ◽  
Statistical Significance ◽  
Previous Treatment ◽  
Progression Free Survival ◽  
Advisory Committees ◽  
Free Survival ◽  
Refractory Multiple Myeloma

Abstract Introduction: Daratumumab is an anti-CD38 IgGκ monoclonal antibody that has been combined successfully with lenalidomide and dexamethasone. The combination of daratumumab with lenalidomide and dexamethasone (DRd) has been compared with lenalidomide and dexamethasone alone (Rd) in patients (pts) with relapsed or refractory multiple myeloma (RRMM) in a randomized phase 3 study (Dimopoulos MA, et al. N Engl J Med 2016; in press). In a pre-specified interim analysis, the DRd combination demonstrated significantly longer progression-free survival (PFS) in addition to deep and durable responses compared with the Rd arm. We performed subgroup analyses to further examine these efficacy data according to prior treatment exposure. Methods: Pts who received ≥1 prior line of therapy were randomized (1:1) to Rd (lenalidomide: 25 mg PO on Days 1-21 of each 28-day cycle; dexamethasone: 40 mg PO weekly) with or without daratumumab (16 mg/kg IV qw for 8 weeks, q2w for 16 weeks, then q4w until progression). The primary endpoint was PFS. Pts who were refractory to lenalidomide were not eligible. All analyses were performed in pts who received 1 to 3 prior lines of therapy. Results: Median follow-up was 13.5 months. Pts who were lenalidomide-naive prior to the start of study treatment (DRd, n=226; Rd, n=219) demonstrated significantly longer PFS with DRd vs Rd (median: not reached [NR] vs 18.4 months; HR, 0.36; 95% CI, 0.25-0.52; P<0.0001), with estimated 12-month PFS rates of 83.0% vs 59.9%, respectively. ORR was significantly higher with DRd vs Rd (96% vs 79%), with ≥VGPR rates of 76% vs 47% and ≥CR rates of 44% vs 21%, respectively (P<0.0001 for all). In the lenalidomide-exposed subgroup (DRd, n=46; Rd, n=45), median PFS was NR in both treatment groups (HR, 0.49; 95% CI, 0.22-1.12; P=0.0826); estimated 12-month PFS rates were 84.1% vs 63.1%, respectively. ORR was higher with DRd vs Rd but did not reach statistical significance (87% vs 71%; P=0.0729); however, rates of ≥VGPR (78% vs 38%; P=0.0001) and ≥CR (44% vs 12%; P=0.0011) were significantly improved with DRd vs Rd, respectively. For bortezomib-naive pts (DRd, n=44; Rd, n=45), PFS was significantly longer with DRd vs Rd (median: NR vs 15.8 months; HR, 0.34; 95% CI, 0.13-0.86; P=0.0170), with estimated 12-month PFS rates of 85.4% vs 69.2%, respectively. ORR was significantly higher with DRd vs Rd (98% vs 82%; P=0.0158), with trends toward increased rates of ≥VGPR (74% vs 55%; P=0.0544) and ≥CR (42% vs 23%; P=0.0576). In the bortezomib-exposed pts (DRd, n=228; Rd, n=219), median PFS was NR in DRd vs 18.4 months in Rd (HR, 0.35; 95% CI, 0.24-0.50 P<0.0001); estimated 12-month PFS rates were 82.8% vs 58.7%, respectively. Significant differences in ORR (93% vs 77%), rate of ≥VGPR (77% vs 43%) and rate of ≥CR (44% vs 19%) were observed with DRd vs Rd, respectively (P<0.0001 for all). Among bortezomib-refractory patients (DRd, n=54; Rd, n=49), the PFS benefit of DRd compared with Rd was maintained (median: NR vs 10.3 mo, respectively; HR, 0.46; 95% CI, 0.25-0.85; P=0.0117; Figure). The estimated 12-month PFS rates were 70.8% vs 44.4%, respectively. Similar to bortezomib-exposed pts, ORR (92% vs 68%; P=0.0024), rate of ≥VGPR (75% vs 36%; P=0.0001), and rate of ≥CR (46% vs 13%; P=0.0003) were all significantly higher with DRd vs Rd for bortezomib-refractory pts. Updated data will be presented at the meeting. Conclusions: Among pts who received 1 to 3 prior lines of therapy, significantly longer PFS and higher ORR were observed with DRd vs Rd among pts who previously received bortezomib or were refractory to bortezomib or were lenalidomide-naive. Higher rates of deeper responses were observed in pts who previously received lenalidomide or bortezomib. Follow-up is ongoing to assess PFS in pts who received 1 to 3 prior lines of therapy and previously received lenalidomide. These results further strengthen the significant benefit of combining daratumumab with Rd for RRMM. Figure Progression-free Survival in Bortezomib-refractory Patients who Received 1 to 3 Prior Lines of Therapy Figure. Progression-free Survival in Bortezomib-refractory Patients who Received 1 to 3 Prior Lines of Therapy Disclosures Moreau: Janssen: Honoraria, Speakers Bureau; Novartis: Honoraria; Takeda: Honoraria; Celgene: Honoraria; Amgen: Honoraria; Bristol-Myers Squibb: Honoraria. Kaufman:Pharmacyclics: Consultancy; Incyte: Consultancy; Novartis: Consultancy, Research Funding; Celgene: Consultancy, Research Funding. Sutherland:Celgene: Consultancy, Honoraria; Amgen: Consultancy, Honoraria; Janssen: Consultancy, Honoraria. Lalancette:Celgene: Honoraria; BMS: Honoraria. Iida:Celgene: Honoraria, Research Funding; Janssen Pharmaceuticals: Honoraria, Research Funding. Prince:Janssen: Honoraria; Celgene: Honoraria. Cochrane:BMS: Other: Received sponsorship to attend international meetings; Novartis: Other: Received sponsorship to attend international meetings; Celgene: Other: Received sponsorship to attend international meetings; Takeda: Other: Received sponsorship to attend international meetings. Khokhar:Janssen: Employment. Guckert:Johnson & Johnson: Equity Ownership; Janssen: Employment. Qin:Janssen: Employment. Oriol:Janssen: Honoraria, Membership on an entity's Board of Directors or advisory committees; Celgene: Honoraria, Membership on an entity's Board of Directors or advisory committees; Amgen: Honoraria, Membership on an entity's Board of Directors or advisory committees.

scholarly journals Pmd-107: Marizomib, Pomalidomide and Low Dose-Dexamethasone Combination Study in Relapsed/Refractory Multiple Myeloma (NCT02103335): Full Enrollment Results from a Phase-1 Multicenter, Open Label Study

Blood ◽  
2016 ◽  
Vol 128 (22) ◽  
pp. 3326-3326 ◽  
Author(s):  
Andrew Spencer ◽  
Simon Harrison ◽  
Jacob P. Laubach ◽  
Jeffrey Zonder ◽  
Ashraf Z Badros ◽  
...  
Keyword(s):  
Multiple Myeloma ◽  
High Risk ◽  
Board Of Directors ◽  
Research Funding ◽  
Low Dose ◽  
Employment Equity ◽  
Advisory Committees ◽  
Refractory Multiple Myeloma ◽  
Heavily Pretreated ◽  
Equity Ownership

Abstract Marizomib (MRZ) is a novel, irreversible, pan subunit proteasome inhibitor (PI) with preclinical evidence demonstrating in vitro and in vivo activity in multiple myeloma (MM). This study was designed to evaluate the safety and antimyeloma activity of pomalidomide (POM), MRZ and low dose dexamethasone (Lo-DEX) (PMD) in patients with relapsed and refractory multiple myeloma (RRMM). Thirty-eight heavily pretreated patients with RRMM were enrolled [dose-escalation cohort (n=14); recommended Phase 2 dose (RP2D) cohort (n=24)]. IV MRZ (0.3 to 0.5 mg/m2) was administered on Days (D) 1, 4, 8, 11; POM (3 or 4 mg) on D1 through 21; and Lo-DEX (5 or 10 mg) on D1, 2, 4, 5, 8, 9, 11, 12, 15, 16, 22, 23 of every 28-D cycle. Patients received a median of 4 (range 1-9) prior lines of therapy; 100% received prior lenalidomide (LEN) and bortezomib (BTZ), 34% carfilzomib (CFZ), and 50% thalidomide. 53% of patients were refractory to both LEN and BTZ and 21% were refractory to LEN, BTZ, and CFZ. There were no dose limiting toxicities during the study. The most common study treatment related ≥Grade 3 adverse events (AEs) were neutropenia (11/38 pts: 29%), pneumonia (4/38 pts 11%), anemia (4/38 pts; 11%), thrombocytopenia (4/38 pts; 11%), and febrile neutropenia (2/38 pts; 5%), with two grade 4 AEs (neutropenia related to POM and viral infection related to DEX), and one grade 5 AE (cardio-respiratory arrest from a suspected PE related to POM). Overall, MRZ was well tolerated, did not add to the incidence or severity of POM/Lo-DEX AEs and the regimen may have fewer hematological and infectious AEs compared to that observed with POM/Lo-DEX. MRZ pharmacokinetic analysis revealed that it was rapidly cleared with a short T1/2 (6.2-11mins) and a large volume of distribution (41-86L) suggesting extensive tissue distribution. Pharmacodynamic analysis demonstrated rapid and robust inhibition of chymotrypsin-like activity in both packed whole blood (PWB) and peripheral blood mononuclear cells (PMBCs), reflecting the irreversible binding nature of MRZ. Evolving inhibition of trypsin-like and caspase-like proteasome activity was also observed in PWB and PBMC with continued dosing. The overall response rate (ORR) and clinical benefit rate (CBR) for the 36 response evaluable patients was 53% (19/36) and 64% (23/36), respectively (Table 1). Subpopulation analysis demonstrated an ORR of 50% (5/10) in high risk cytogenetic patients, 56% (10/18) in LEN/BTZ refractory patients, 71% (5/7) in LEN/BTZ/CFZ refractory patients and 80% (8/10) in CFZ refractory patients. These data compare favorably against POM/Lo-Dex with a near doubling of ORR in both the total patient population and the double refractory patients. Substantial activity in high-risk patients that are triple refractory and in patients that are refractory to CFZ in prior last regimen was observed. MRZ activity in RRMM patients exposed and/or refractory to multiple PIs is likely a consequence of its unique pan proteasome subunit inhibitory actions. In conclusion, MRZ in combination with POM and Lo-DEX was well tolerated and demonstrated promising activity in heavily pretreated, high-risk RRMM patients. Table 1 Table 1. Disclosures Harrison: Janssen-Cilag: Research Funding, Speakers Bureau; Celgene: Honoraria. Zonder:Prothena: Consultancy, Honoraria; Seattle Genetics: Consultancy, Honoraria; Bristol Myers Squibb: Consultancy, Honoraria; Janssen: Consultancy, Honoraria; Celgene: Consultancy, Honoraria, Research Funding; Takeda: Consultancy, Honoraria; Pharmacyclics: Other: DSMC membership. Khot:Amgen: Honoraria; Janssen: Consultancy; Pfizer: Speakers Bureau. Anderson:C4 Therapeutics: Equity Ownership; Millennuim: Membership on an entity's Board of Directors or advisory committees; Oncoprep: Equity Ownership; C4 Therapeutics: Equity Ownership; Gilead: Membership on an entity's Board of Directors or advisory committees; Gilead: Membership on an entity's Board of Directors or advisory committees; Celgene: Membership on an entity's Board of Directors or advisory committees; Celgene: Membership on an entity's Board of Directors or advisory committees; Acetylon: Equity Ownership; Acetylon: Equity Ownership; Oncoprep: Equity Ownership; Millennuim: Membership on an entity's Board of Directors or advisory committees; Bristol Myers Squibb: Membership on an entity's Board of Directors or advisory committees; Bristol Myers Squibb: Membership on an entity's Board of Directors or advisory committees. MacLaren:Triphase Accelerator: Employment, Equity Ownership. Reich:Triphase Accelerator: Consultancy. Trikha:Encycle Therapeutics: Consultancy, Equity Ownership; Triphase Accelerator: Employment, Equity Ownership. Richardson:Jazz Pharmaceuticals: Consultancy, Membership on an entity's Board of Directors or advisory committees.

The PI3K Inhibitor GDC-0941 Synergizes with Standard of Care Therapies to Induce Growth Inhibition and Apoptosis of Multiple Myeloma Cells.

Blood ◽  
2009 ◽  
Vol 114 (22) ◽  
pp. 3788-3788
Author(s):  
Veerendra Munugalavadla ◽  
Leanne Berry ◽  
Changchun Du ◽  
Sanjeev Mariathasan ◽  
Dion Slaga ◽  
...  
Keyword(s):  
Multiple Myeloma ◽  
Research Funding ◽  
Single Agent ◽  
Standard Of Care ◽  
Rational Approach ◽  
Current Standard ◽  
Employment Equity ◽  
Specific Flow ◽  
Equity Ownership

Abstract Abstract 3788 Poster Board III-724 Multiple myeloma (MM) is a malignancy characterized by clonal expansion and accumulation of long-lived plasma cells within the bone marrow. Phosphatidylinositol 3' kinase (PI3K) -mediated signaling is frequently dysregulated in cancer and controls fundamental cellular functions such as cell migration, growth, survival and development of drug resistance in many cancers, including MM, and therefore represents an attractive therapeutic target. Here, we demonstrate in vitro, that a potent and selective pan-isoform PI3Kinhibitor, GDC-0941, modulates the expected pharmacodynamic markers, inhibits cell-cycle progression and induces apoptosis; overcomes resistance to apoptosis in MM cells conferred by IGF-1 and IL-6; and is additive or synergistic with current standard of care drugs including dexamethasone, melphalan, lenolidamide and bortezomib. In cell lines we find sensitivity to GDC-0941 is positively correlated with pathway activation as determined by phospho-AKT-specific flow-cytometry and Western-blot analysis. Preliminary results indicate apoptosis of MM cells is correlated with increased expression of the proapoptotic BH3-only protein BIM; mechanisms of increased apoptosis in MM will be further explored and an update presented. We further extend these in vitro findings to show that GDC-0941 has activity as a single agent in vivo and combines well with standard of care agents in several murine xenograft models to delay tumor progression and prolong survival. Our results suggest that GDC-0941 may combine well with existing therapies, providing a framework for the clinical use of this agent, and a rational approach to improving the efficacy of myeloma treatment. Disclosures: Munugalavadla: Genentech: Employment, Patents & Royalties. Berry:Genentech: Employment, Patents & Royalties. Du:Genentech, Inc.: Employment, Equity Ownership. Mariathasan:Genentech: Employment, Patents & Royalties. Slaga:Genentech: Employment, Patents & Royalties. Sun:Genentech Inc.: Employment. Chesi:Genentech, Inc.: Consultancy; Amgen: Consultancy; Celgene: Consultancy; Merck: Research Funding. Bergsagel:Genentech: Consultancy; Amgen: Consultancy; Celgene: Consultancy; Merck: Research Funding. Ebens:Genentech, Inc.: Employment, Equity Ownership, Patents & Royalties.

Phase 1, Multicenter, Open-Label, Combination Study (NPI-0052-107; NCT02103335) of Pomalidomide (POM), Marizomib (MRZ, NPI-0052), and Low-Dose Dexamethasone (LD-DEX) in Patients with Relapsed and Refractory Multiple Myeloma

Blood ◽  
2015 ◽  
Vol 126 (23) ◽  
pp. 4220-4220 ◽  
Author(s):  
Andrew Spencer ◽  
Jacob P. Laubach ◽  
Jeffrey A Zonder ◽  
Ashraf Z Badros ◽  
Simon Harrison ◽  
...  
Keyword(s):  
Multiple Myeloma ◽  
High Risk ◽  
Board Of Directors ◽  
Dose Escalation ◽  
Research Funding ◽  
Advisory Committees ◽  
In Vivo Models ◽  
Once Daily ◽  
Refractory Multiple Myeloma ◽  
Equity Ownership

Abstract Introduction: MRZ is a novel, irreversible, proteasome inhibitor (PI) under clinical development for the treatment of relapsed and refractory multiple myeloma (RRMM). MRZ potently inhibits the 3 proteolytic activities of the 20S proteasome with specificity and activity distinct from that of bortezomib (BZ) and carfilzomib (CFZ). The combination of MRZ and POM has demonstrated promising synergy in in vitro and in vivo models of MM. Methods: As of July 22, 2015, 22 of 36 planned patients (pts) were enrolled with 14 pts in the 3+3 dose-escalation stage and 8 pts into the Recommended Phase 2 Dose (RP2D) stage. All pts received ≥2 prior therapies that must have included both lenalidomide (LEN) and BZ, and have been refractory to their last therapy. Intravenous MRZ (0.3 to 0.5 mg/m2) was administered over 120 minutes on Days (D) 1, 4, 8, and 11; POM (3 or 4 mg) once daily on D1 through 21; and Lo-DEX (5 or 10 mg) once daily on D1, 2, 4, 5, 8, 9, 11, 12, 15, 16, 22, and 23 of every 28-D cycle. Safety, pharmacokinetics (PK), cytogenetics, proteasome inhibition, and clinical response were assessed. Results: Pts were 68% male, median (range) age 62 yrs (31 - 76), and with a median of 5 (2 - 15) prior lines of therapy. All pts received prior BZ and LEN; 41% and 55% had also received prior CFZ and thalidomide (THAL), respectively. There were no DLTs during dose-escalation and the most common (>10% incidence) adverse events (AEs) related to any study treatment in the 22 pts included fatigue (41%), neutropenia (41%), anemia (27%), thrombocytopenia (23%), nausea (18%), diarrhea, dyspnea, insomnia, edema peripheral, and white blood cell count decreased (14%). The grade 3 AEs related to any study treatment in more than one pt included neutropenia (27%) and anemia (9%), pneumonia (9%), and thrombocytopenia (9%). The only grade 4 AE related to any study treatment was neutropenia in one pt. Tumor lysis syndrome (grade 2) related to study treatment was observed in 1 pt; 2 pts had grade 1 peripheral neuropathy (1 considered related to POM alone and 1 related to possibly MRZ and POM); 2 pts came off study and subsequently died from progressive disease (61 and 102 days after last dose); and 1 pt died suddenly during Cycle 1 due to cardiopulmonary arrest, considered possibly related to POM. Since no DLTs were observed the maximum tolerated dose was not exceeded, the highest dose cohort studied, MRZ 0.5 mg/m2, POM 4 mg, and Lo-DEX 10 mg, was determined to be the RP2D. All 17 pts with pre and post dose measurements demonstrated a rapid decrease in their myeloma proteins by C2D1. Preliminary IMWG response assessments provided for the 14 pts with response data through C3D1 included 9 (64%) with partial response (PR); 2 (14%) with minimal response (MR); and 3 (21%) with stable disease (SD). The overall response rate (PR) was 64% and the clinical benefit rate (MR + PR) was 79%. Subset analyses of these 14 pts included high risk cytogenetics (17p deletion and/or 4:14 chromosome translocation) and prior CFZ treatment. In the high risk cytogenetics there were 4/5 PRs and 1/5 MR. Of the 7 pts with prior CFZ treatment there were 5 with PR and 2 with SD, and all 4 pts who had CFZ in their last regimen achieved PR. There was ~100% inhibition of the chymotrypsin-like subunit as early as C1D11, with robust inhibition of the trypsin-like and caspase-like subunits evolving over time in whole blood assays. MRZ, POM, and Lo-DEX PK are in process and will be presented. Conclusions: MRZ in combination with POM and Lo-DEX was generally well tolerated and demonstrated promising activity in heavily pre-treated pts with RRMM including those with high risk cytogenetics and who were refractory to prior treatment with CFZ. The trial will enroll up to 22 pts at the RP2D (36 pts total) to provide additional safety and efficacy data. Disclosures Off Label Use: marizomib for relapsed multiple myeloma. Laubach:Novartis: Research Funding; Onyx: Research Funding; Celgene: Research Funding; Millennium: Research Funding. Zonder:Seattle Genetics: Membership on an entity's Board of Directors or advisory committees; BMS: Membership on an entity's Board of Directors or advisory committees; Prothena: Membership on an entity's Board of Directors or advisory committees; Celgene: Membership on an entity's Board of Directors or advisory committees, Other: research support. Harrison:Celgene: Honoraria, Research Funding. Khot:Amgen: Honoraria; Novartis: Honoraria; Roche: Honoraria; Janssen: Honoraria. Chauhan:Triphase: Consultancy. Anderson:Celgene: Consultancy; Millennium: Consultancy; BMS: Consultancy; Gilead: Consultancy; Oncopep: Equity Ownership; Acetylon: Equity Ownership. Reich:Triphase Accelerator Corporation: Consultancy. Trikha:Triphase Accelerator Corporation: Employment. Richardson:Novartis: Membership on an entity's Board of Directors or advisory committees; Celgene Corporation: Membership on an entity's Board of Directors or advisory committees; Gentium S.p.A.: Membership on an entity's Board of Directors or advisory committees, Research Funding; Millennium Takeda: Membership on an entity's Board of Directors or advisory committees; Jazz Pharmaceuticals: Membership on an entity's Board of Directors or advisory committees, Research Funding.

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