On January 24, 2022 Karyopharm Therapeutics Inc. (Nasdaq: KPTI), a commercial-stage pharmaceutical company pioneering novel cancer therapies, reported 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) (Press release, Karyopharm, JAN 24, 2022, View Source [SID1234606723]). 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.

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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.

"We are pleased to receive the FDA’s orphan drug designation for eltanexor in MDS and believe it reinforces eltanexor’s potential to improve clinical outcomes for patients with HMA-refractory MDS," said Richard Paulson, President and Chief Executive Officer of Karyopharm. "We are focused on advancing our ongoing clinical trials and remain steadfast in our commitment to bringing this new treatment option to patients and their families."

Orphan drug designation by the FDA is granted to promote the development of drugs that target conditions affecting 200,000 or fewer U.S. patients annually and are expected to provide a significant therapeutic advantage over existing treatments. Orphan designation qualifies a company for certain incentives that apply across all stages of drug development, including the potential for seven years of market exclusivity following marketing approval, tax credits on qualified U.S. clinical trials, eligibility for orphan drug grants, and exemption from certain administrative fees.

About Eltanexor

Eltanexor (KPT-8602) is an investigational novel SINE compound that, like selinexor, functions by binding with, and inhibiting, the nuclear export protein, XPO1, leading to the accumulation of tumor suppressor proteins in the cell nucleus. This reinitiates and amplifies their tumor suppressor function and is believed to lead to the selective induction of apoptosis in cancer cells, while largely sparing normal cells.

In preclinical models, eltanexor has a broad therapeutic window with minimal penetration of the blood brain barrier and, therefore, has the potential to serve as another SINE compound for cancer indications. Following oral administration, animals treated with eltanexor show lower percentage of body weight loss and improved food consumption than animals similarly treated with selinexor. This allows more frequent dosing of eltanexor, enabling a longer period of exposure than is possible with selinexor.

Eltanexor is an investigational medicine and has not been approved by the United States Food and Drug Administration or any other regulatory agency.