Fulvestrant is indicated for the treatment of estrogen receptor positive, locally advanced or metastatic breast cancer in postmenopausal women…

...- ER+/HER2+ breast, ovarian, cervical, endometrial cancer, or other solid cancers, resistance to standard therapies with a PIK3CA gene mutation (Part C), AKT1 gene mutation (Part D) or a dysregulatory aberration on the PIK/AKT pathway (Part D), advanced or metastatic ER+ positive breast cancer that has an AKT1 gene mutation (Part E) or advanced or metastatic ER+ positive breast cancer that has a PTEN gene mutation (Part F)....

We analyzed the data from 94 patients with ER-positive HER2-positive AMBC enrolled in the Safari study (UMIN000015168), a retrospective cohort study of 1072 ER-positive AMBC patients in a postmenopausal hormonal state who received fulvestrant 500 mg (F500): (1) to compare time to treatment failure (TTF) and overall survival (OS) by treatment group...In the 59 patients who received endocrine therapy or anti-HER2 therapy as initial systemic therapy before chemotherapy, those with TTC ≥3 years had longer median OS than those with TTC <3 years (10.5 vs. 5.9 years; HR, 0.32; p = 0.001). Longer TTC was associated with prolonged OS....In patients with ER-positive HER2-positive AMBC enrolled in the Safari study, TTF was longer in patients who received F500 as first- or second-line therapy.