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Sonneveld, Pieter; Richardson, Paul G.; Ludwig, Heinz; Dimopoulos, Meletios-Athanasios; Schjesvold, Fredrik H.; Hájek, Roman; Abdulhaq, Haifaa; Thuresson, Marcus; Norin, Stefan; Bakker, Nicolaas A.; Mateos, Maria-Victoria
Clinical lymphoma, myeloma and leukemia, 09/2023, Volume: 23, Issue: 9Journal Article
Melphalan flufenamide (melflufen), a first-in-class alkylating peptide-drug conjugate, plus dexamethasone demonstrated superior progression-free survival (PFS) but directionally different overall survival (OS) favoring pomalidomide (hazard ratio HR, 1.10) in OCEAN. These analyses further investigated prognostic subgroups impacting survival in updated data from the randomized, phase 3 OCEAN study (NCT03151811; date: February 3, 2022) and the phase 2 HORIZON study (NCT02963493; date: February 2, 2022). In OCEAN, subgroups prognostic for OS were age (P = .011; <65 years favored pomalidomide) and no previous autologous stem cell transplant (ASCT) or progression >36 months after ASCT (P = .001; favored melflufen). Overall, 245 of 495 (49%) patients randomized had received a previous ASCT, of which 202 (82%) had progressed within 36 months following their ASCT. When excluding patients who had progressed <36 months post-ASCT (melflufen group, n = 145; pomalidomide group, n = 148), median OS was 23.6 months with melflufen and 19.8 months with pomalidomide (HR, 0.83 95% CI, 0.62-1.12; P = .22). Among patients with triple-class refractory disease in HORIZON, patients who had progressed <36 months post-ASCT (n = 58) had a lower response rate and shorter duration of response and PFS than the remaining patients (n = 52). Safety was consistent with previous reports. These analyses demonstrate a consistent benefit for melflufen and dexamethasone in patients with relapsed/refractory multiple myeloma who have not received an ASCT or progressed >36 months after receiving an ASCT (ClinicalTrials.gov identifier: NCT03151811). These analyses support the approval of melflufen plus dexamethasone by the European Medicines Agency for use in patients with relapsed/refractory multiple myeloma who have received ≥3 prior lines of therapy, whose disease is triple-class refractory, who have demonstrated disease progression on or after their last therapy, and who had no prior autologous stem cell transplant or who progressed ≥3 years from transplantation.
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