Showing a significant efficacy signal in a phase II trial, Relay Therapeutics Inc.’s zovegalisib (RLY-2608) achieved a 60% volumetric response in patients with PIK3CA-driven vascular anomalies (VAs). The isoform-selective PI3Ka inhibitor is in late-stage clinical trials with various combinations for P13Ka-mutated, HR+/HER2- advanced breast cancer, with VAs representing a second indication for which Leerink Partners analyst Andrew Berens forecasts $2.8 billion in peak revenues.