BridgeBio (BBIO) Begins Dosing with Gene Therapy in CAH Study Posted byZacks Equity Research January 28, 2022 Leave a comment on BridgeBio (BBIO) Begins Dosing with Gene Therapy in CAH Study BridgeBio (BBIO) doses the first patient in a phase I/II study evaluating its investigational gene therapy candidate, BBP-631, for treating classic congenital adrenal hyperplasia.