Mustang Bio Receives Orphan Drug Designation for MB-102 (CD123 CAR T)

Mustang Bio announced that the U.S. Food and Drug Administration (FDA) has granted Orphan Drug Designation to MB-102 (CD123 CAR T) for the treatment of blastic plasmacytoid dendritic cell neoplasm (BPDCN), a rare and incurable blood cancer with a median survival of less than 18 months and no standard of care.

Martina Sersch, M.D., Ph.D., Chief Medical Officer of Mustang, said, “We are pleased to receive Orphan Drug Designation for MB-102, which has shown the potential to address an area of high unmet medical need. This significant milestone for Mustang will provide additional market exclusivity and financial benefits to advance MB-102, which we believe is an important new treatment for patients with BPDCN. Based on the Phase 1 data presented at the American Society of Hematology (ASH) Annual Meeting in December 2017 and the American Association for Cancer Research (AACR) Special Conference on Tumor Immunology and Immunotherapy in November 2018, we expect to initiate a multicenter Phase 1/2 clinical trial in patients with acute myeloid leukemia (AML), BPDCN and high-risk myelodysplastic syndrome in 2019.”

MB-102 is currently being studied in a single center, first-in-human Phase 1 dose-escalation clinical trial evaluating the safety and anti-tumor activity of escalating doses of MB-102 in patients with relapsed or refractory AML (cohort 1) and BPDCN (cohort 2). Patients receive a single dose of MB-102 with an option for a second infusion if they continue to meet safety and eligibility criteria and still have CD123+ disease. MB-102 has demonstrated complete responses at low doses in AML and BPDCN without dose-limiting toxicities.

The FDA grants Orphan Drug Designation to drugs and biologics that are intended for the safe and effective treatment, diagnosis or prevention of rare diseases or disorders that affect fewer than 200,000 people in the U.S. Orphan Drug Designation provides certain incentives, such as tax credits toward the cost of clinical trials and prescription drug user fee waivers. If a product holding Orphan Drug Designation receives the first FDA approval for the disease in which it has such designation, the product is entitled to seven years of market exclusivity, which is independent from intellectual property protection.