Xpovio receives FDA approval for refractory or relapsed multiple myeloma

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FDA has approved Xpovio (selinexor) in combination with bortezomib and dexamethasone for the treatment of adult patients with multiple myeloma who have received at least one prior therapy.

Xpovio is sponsored by Karyopharm Therapeutics Inc.

FDA granted Xpovio accelerated approval in 2019 in combination with dexamethasone for the treatment of adult patients with relapsed or refractory multiple myeloma who received at least four prior therapies and whose disease is refractory to at least two proteasome inhibitors, at least two immunomodulatory agents, and an anti-CD38 monoclonal antibody.

Efficacy of Xpovio in combination with bortezomib and dexamethasone was evaluated in the BOSTON Trial (KCP-330-023, NCT03110562), a randomized (1:1) open-label, multicenter, active comparator-controlled trial in patients with RRMM who had previously received at least one and at most three prior therapies.

Patients received once-weekly selinexor orally in combination with once-weekly bortezomib subcutaneous and low-dose dexamethasone twice-weekly orally compared to the standard twice-weekly bortezomib plus low-dose dexamethasone.

The main efficacy outcome measure was progression free survival assessed by an independent review committee using International Myeloma Working Group response criteria. The estimated median PFS was 13.9 months (95% CI: 11.7, Not Estimable) for the SVd arm and 9.5 months (95% CI: 7.6, 10.8) for the Vd arm (estimated hazard ratio 0.70; 95% CI: 0.53, 0.93).

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