Biotechnology Texas, USA-based clinical-stage biopharma Savara on Tuesday announced that the company received a refuse to file (RTF) letter from the US Food and Drug Administration (FDA) for the biologics license application (BLA) of Molbreevi (molgramostim) as a therapy to treat patients with autoimmune pulmonary alveolar proteinosis (PAP), with the news sending its shares plunging 32% to $1.94. 28 May 2025