A) MCF10A cells stably expressing GFP, PIK3CA WT, E545K, or H1047R were starved for 24h, treated with 20μM LY294002 for 0–120 minutes and lysates were evaluated by immunoblot. B) MCF10A cells stably expressing GFP, PIK3CA WT, E545K, or H1047R were starved for 24h, treated with 20μM LY294002 for 0–10h and lysates were evaluated by immunoblot for the indicated signaling molecules.