P4‐663: INITIATION OF THE PHASE 2/3 GAIN TRIAL OF COR388, A NOVEL BACTERIAL VIRULENCE FACTOR INHIBITOR FOR THE TREATMENT OF ALZHEIMER'S DISEASE (AD) BASED ON PHASE I A/B SAFETY, PK, BIOMARKER AND EFFICACY DATA. (1st July 2019) - Detke, Mike; Lynch, Casey; Holsinger, Leslie; Kapur, Shirin; Hennings, Dave; Raha, Debasish; Ermini, Florian; Haditsch, Ursula; Ryder, Mark; Goodman, Ira J.; Thein, Stephen G.; Dominy, Steve