Mustang Bio Receives FDA Orphan Drug Designation for MB-101 CAR T-cell Therapy

Wednesday, Jul 9, 2025 11:45 am ET1min read

Mustang Bio has received FDA Orphan Drug Designation for its MB-101 CAR T-cell therapy for treating recurrent astrocytoma and glioblastoma. This designation provides incentives like tax credits and market exclusivity, potentially strengthening Mustang's position in the biopharmaceutical industry. However, the company faces significant financial instability, with zero revenues and continuous losses, leading to a "Underperform" rating from Spark, TipRanks' AI Analyst.

Mustang Bio, Inc. has received a significant boost with the U.S. Food and Drug Administration (FDA) granting Orphan Drug Designation to its MB-101 CAR-T cell therapy for treating recurrent diffuse and anaplastic astrocytoma and glioblastoma (GBM) [1]. This designation provides the company with substantial incentives, including tax credits toward clinical trial costs and market exclusivity, potentially strengthening its position in the biopharmaceutical industry.

MB-101 is a targeted CAR-T cell therapy that aims to treat these aggressive and challenging-to-treat primary brain tumors. The FDA's Orphan Drug Designation signifies a crucial step in addressing the profound unmet medical needs of patients afflicted with these conditions. The designation also underscores the potential of Mustang Bio's innovative combination regimen, MB-109, which pairs MB-101 with an oncolytic virus designed to "heat up" the tumor microenvironment and enhance the CAR T cells' efficacy [2].

Early clinical data, including complete responses in patients with "hot" tumors treated with IL13Ra2-targeted CAR T cells alone, support the potential of this immunotherapeutic approach. However, further funding and clinical evaluation of the combination are critical for progression.

Despite this promising development, Mustang Bio faces significant financial instability. The company has zero revenues and continuous losses, leading to a "Underperform" rating from Spark, TipRanks' AI Analyst. This financial instability may pose challenges in the company's ability to further develop and commercialize MB-101 and MB-109.

The company's ability to further develop the MB-109 program is contingent upon raising additional funding and/or consummating a strategic partnership. Mustang Bio's financial stability will be crucial in determining the success of its innovative therapeutic strategy.

References:
[1] https://www.biospace.com/press-releases/mustang-bio-granted-orphan-drug-designation-by-u-s-fda-for-mb-101-il13ra2-targeted-car-t-cells-to-treat-astrocytomas-and-glioblastoma
[2] https://www.targetedonc.com/view/fda-orphan-drug-status-granted-for-car-t-cell-therapy-in-malignant-gliomas

Mustang Bio Receives FDA Orphan Drug Designation for MB-101 CAR T-cell Therapy

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