Regulatory Shake-Up at FDA's CBER Sparks Biotech Sell-Off Vinay Prasad’s appointment as head of the FDA’s Center for Biologics Evaluation and Research is raising uncertainty in the biotech sector. Multiple cell and gene therapy stocks, including Taysha, Solid Biosciences, and Sarepta, saw double-digit declines as investors worried about stricter review standards and changing regulatory priorities.12