Agreement reached with FDA that cerebral spinal fluid (CSF) heparan sulfate (HS) can be used as a reasonable surrogate endpoint for accelerated approval Data from existing clinical studies appear sufficient for a biologics license application (BLA) submission NOVATO, Calif., June 12, 2024 (GLOBE NEWSWIRE) -- Ultragenyx Pharmaceutical Inc. (NASDAQ: RARE) today announced that the company held a successful meeting with the U.S. Food and Drug Administration (FDA or the Agency) during which the company reached a ...