Karyopharm Gets Orphan Drug Tag for Eltanexor for Myelodysplastic Syndromes

 Karyopharm Therapeutics Inc. (Nasdaq: KPTI), a commercial-stage pharmaceutical company pioneering novel cancer therapies, today announced that the U.S. Food and Drug Administration (FDA) has granted orphan drug designation for eltanexor, a novel oral, Selective Inhibitor of Nuclear Export (SINE) compound, for the treatment of myelodysplastic syndromes (MDS). MDS are a group of diseases characterized by ineffective production of the components of the blood due to poor bone marrow function with a risk of progression to acute myeloid leukemia.

Karyopharm is currently investigating eltanexor in an ongoing open-label Phase 1/2 study as a single-agent or in combination with approved and investigational agents in patients with several types of hematologic and solid tumor cancers (KCP-8602-801; NCT02649790). Previously, Karyopharm reported positive data from an investigator-sponsored Phase 1 study evaluating single-agent eltanexor in patients with hypomethylating agent (HMA)-refractory MDS, where eltanexor demonstrated a 53% overall response rate and median overall survival of 9.9 months. This compares favorably to historical survival of four to six months for HMA-refractory MDS patients.

Approximately 15,000 people are diagnosed with intermediate-to-high risk MDS each year in the U.S.1 HMAs are the current standard of care for newly diagnosed, higher-risk MDS patients. However, only 40-60% of patients respond, with these responses typically lasting less than two years.2 The prognosis in HMA-refractory disease is poor, with a median overall survival of four to six months.3,4 There are currently no approved therapies for HMA- refractory MDS.

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