Treatment with selinexor plus low-dose dexamethasone achieved promising response rates in heavily pretreated refractory multiple myeloma, according to an announcement by Karyopharm Therapeutics.1

For the single-arm, phase 2b STORM trial, researchers enrolled 78 patients with quad-refractory or penta-refractory multiple myeloma. Patients with quad-refractory disease previously received bortezomib, carfilzomib, lenalidomide, and pomalidomide, and their disease was refractory to at least 1 proteasome inhibitor, at least 1 immunomodulatory agent, and progressed following their most recent treatment.

Those with penta-refractory disease had quad-refractory disease that was also refractory to an anti-CD38 monoclonal antibody, such as daratumumab.

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Selinexor in combination with dexamethasone induced an objective response in 20.5% of evaluable patients. The overall response rate was 20.8% and 20.0% for quad-refractory and penta-refractory patients, respectively. Responses included very good partial responses, partial responses, and minor responses.

The safety profile was consistent with previously reported trials, and no new safety signals were observed.

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Selinexor is also being evaluated in combination with bortezomib and dexamethasone in a broader population of patients with multiple myeloma as part of the pivotal phase 3 BOSTON study.


  1. Karyopharm reports positive top-line phase 2b STORM results and reviews the planned development path for selinexor in multiple myeloma [press release]. Karyopharm Therapeutics website. Updated September 6, 2016. Accessed September 6, 2016.