PIK3CA and endometriosis: We compared the MAF of samples in which mutant alleles of PIK3CA were detected in ten groups: OCCC (epithelial and stromal components of tumors sampled by LCM), endometriosis (comorbid endometriosis in OCCC and ECs), and eutopic endometrium (endometrial glands of OCCC with PIK3CA mutation in the tumor, OCCC without PIK3CA mutation in the tumor, HGSOC, EC, healthy control, and endometrial stroma).