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The Food and Drug Administration on Wednesday approved a new drug to treat patients with multiple myeloma, overruling a panel of outside cancer experts who expressed concerns about its toxicity.

The new multiple myeloma drug, called selinexor, will be marketed by Karyopharm Therapeutics under the brand name Xpovio.

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The FDA cleared Xpovio under an accelerated, or conditional, approval based on a single-arm clinical trial showing a 25% tumor response rate. The patients enrolled in the clinical trial had advanced multiple myeloma no longer responsive to at least four prior therapies. 

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