Draft Guidance from FDA Introduces Important Changes to Drug Development for Rare Diseases

On February 23, 2026, FDA issued a Draft Guidance document, called “Considerations for the use of the Plausible Mechanism Framework to Develop Individualized Therapies that Target Specific Genetic Conditions with Known Biological…

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FDA Approves First Treatment for Stem Cell Transplant–Associated Thrombotic Microangiopathy

The U.S. Food and Drug Administration (FDA) has approved Yartemlea (narsoplimab‑wuug), marking the first authorized therapy for hematopoietic stem cell transplant‑associated thrombotic microangiopathy (TA‑TMA) in adults and children aged 2…

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FDA Extends Review Timeline for Denali Therapeutics’ Tividenofusp Alfa in Hunter Syndrome

Denali Therapeutics (Nasdaq: DNLI) announced that the U.S. Food and Drug Administration (FDA) has extended the review period for its Biologics License Application (BLA) for tividenofusp alfa, an investigational therapy…

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FDA Rejects Ultragenyx’s Gene Therapy for Rare Disease, Citing Manufacturing Concerns

Ultragenyx Pharmaceutical, a biotechnology company developing treatments for rare diseases, has received a setback from the U.S. Food and Drug Administration (FDA) regarding its gene therapy candidate, DTX401.  According to…

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