LX-086 showed antitumor efficacy in HER2+/HR+, PIK3CA amplified breast cancer BT-474 CDX model (TGI = 106% @40 mpk, QD), as well as in the HER2-/HR+, PIK3CA H1047R breast cancer T47D CDX model (TGI = 84.7%@40 mpk, QD) and PIK3CA H1047R ovarian cancer SK-OV-3 CDX model (TGI = 69.2%@40 mpk, QD).