Agios Pharmaceuticals announced the U.S. Food and Drug Administration (FDA) has granted orphan drug designation to the company’s first-in-class pyruvate kinase R (PKR) activator mitapivat for the treatment of patients with sickle cell disease. Mitapivat is an investigational, oral, small molecule allosteric activator of wild-type and a variety of mutated PKR enzymes.
“Receiving orphan drug designation for mitapivat in sickle cell disease is an important recognition of the tremendous unmet need among this patient community, which has historically been underserved,” said Chris Bowden, M.D., chief medical officer at Agios. “As the pioneers in PKR activation, we believe this mechanism has the potential to transform the course of sickle cell disease and are researching mitapivat’s ability to improve red blood cell energy, health and longevity. We look forward to continued partnership with the sickle cell disease community and expect to initiate our Phase 3 study next year.”
The FDA’s Office of Orphan Drug Products grants orphan status to support the development of medicines for rare disorders that affect fewer than 200,000 people in the U.S. Orphan drug designation provides certain benefits, including market exclusivity upon regulatory approval if received, exemption of FDA application fees and tax credits for qualified clinical trials.
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Mitapivat was previously granted orphan drug designation by the FDA and the European Medicines Agency for the treatment of pyruvate kinase (PK) deficiency, a rare, debilitating, hemolytic anemia, and by the FDA for the treatment of thalassemia.
Mitapivat is being evaluated as a potential treatment for sickle cell disease under a Cooperative Research and Development Agreement (CRADA) with the U.S. National Institutes of Health. Mitapivat has been shown to decrease 2,3-diphosphoglycerate (2,3-DPG) and increase adenosine triphosphate (ATP), and through this mechanism, it may reduce hemoglobin S polymerization and red blood cell sickling. Agios expects to initiate a Phase 3, global, pivotal study of mitapivat in sickle cell disease in 2021.