BRCA1 and breast cancer: STIC appears to be a precursor lesion for pelvic (tubal, ovarian, or primary peritoneal) high-grade serous carcinoma (HGSC) and is a non-invasive subtype of HGSC, usually located at the distal fimbriated end of the fallopian tube, often related to BRCA1 or BRCA2 mutations and associated with breast cancer [48,49,50,51,52].