BioMarin Hold Extended as FDA Seeks More Data

FDA has extended a clinical hold on BioMarin Pharmaceutical’s PHEARLESS Phase 1/2 study of BMN 307, an AAV5-human phenylalanine hydroxylase gene therapy being studied in adults with phenylketonuria. The trial has been on hold since 9/2021, and now FDA has requested data from additional non-clinical studies to assess the theoretical oncogenic risk to human study participants, which is expected to take several quarters, according to the company.

 

At the time of the initial hold, a company statement said the clinical hold was based on interim safety findings from a pre-clinical, non-GLP (good laboratory practice) pharmacology study. It further said that BioMarin was pausing further enrollment in the global Phase 1/2 study pending investigation of findings of cancers in some rodents treated with the drug.

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