PIK3CA and serous adenocarcinoma: However, the molecular profiles of type 1 tumours differ from each other (KRAS, BRAF, ERBB2, and PIK3CA mutations for low-grade serous carcinoma, ARID1A, CTNNB1, PTEN, PIK3CA, and PPP2R1A mutations for the endometrioid subtypes, ARID1A, PIK3CA, ZNF217, and PPP2R1A mutations for clear cell carcinoma, and KRAS and HER2 mutations for mucinous carcinoma).