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Clinical Trial, Phase I
Journal Article
Multicenter Study
Research Support, Non-U.S. Gov't
Safety and efficacy of selinexor in relapsed or refractory multiple myeloma and Waldenstrom macroglobulinemia.
Blood 2018 Februrary 23
Novel therapies are needed for patients with relapsed or refractory multiple myeloma (MM). We conducted a multicenter, phase 1 study in advanced hematological malignancies to assess the safety, efficacy, and recommended phase 2 dose (RP2D) of oral selinexor, a selective inhibitor of the nuclear export protein XPO1. In the dose-escalation phase, 25 patients with heavily pretreated MM (22) or Waldenstrom macroglobulinemia (3) were administered selinexor (3-60 mg/m2 ) in 8 or 10 doses per 28-day cycle. In the dose-expansion phase, 59 patients with MM received selinexor at 45 or 60 mg/m2 with 20 mg dexamethasone, twice weekly in 28-day cycles, or selinexor (40 or 60 mg flat dose) without corticosteroids in 21-day cycles. The most common nonhematologic adverse events (AEs) were nausea (75%), fatigue (70%), anorexia (64%), vomiting (43%), weight loss (32%), and diarrhea (32%), which were primarily grade 1 or 2. The most common grade 3 or 4 AEs were hematologic, particularly thrombocytopenia (45%). Single-agent selinexor showed modest efficacy with an objective response rate (ORR) of 4% and clinical benefit rate of 21%. In contrast, the addition of dexamethasone increased the ORR with all responses of ≥partial response occurring in the 45 mg/m2 selinexor plus 20 mg dexamethasone twice weekly cohort (ORR = 50%). Furthermore, 46% of all patients showed a reduction in MM markers from baseline. Based on these findings, we conclude that selinexor in combination with dexamethasone is active in heavily pretreated MM and propose a RP2D of 45 mg/m2 (80 mg) plus 20 mg dexamethasone given twice weekly. This trial was registered at clinicaltrials.gov as #NCT01607892.
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