PIK3CA and mucinous neoplasm: EOC is divided into two types, some of the tumors that are called Type I derived from borderline tumors including low grade serous and mucinous tumors which have high frequency mutations in k-ras, CTNNB1, PTEN, PIK3CA, BRAF, ERBB2 (25), but some of the tumors that are called Type II, derived from intraepithelial pathological cells in the fallopian tube and are characterized by TP53 mutations.