[A successful case of a super-elderly breast cancer patient treated with hormone therapy].

A 104-year-old female patient with a left breast mass was admitted to our hospital. Ultrasonography showed an irregular and low-echoic mass of about 2.4×2.4×1.4 cm size in the left breast EAC area. Core needle biopsy examination indicated invasive ductal carcinoma of the breast: ER (+), PR (+), and HER2 (-). An overall examination did not show a distant metastasis. We diagnosed her with left breast cancer(luminal A type) T2N0M0, stage IIA. We administered anastrozole at a dose of 1 mg/day. After 6 months, the primary tumor diameter was reduced to 2.1 cm, and the effect of anastrozole was considered a clinical partial response. The patient did not experience any adverse events during treatment. The partial response was maintained for about 2 years. We experienced a successful case of a super-elderly breast cancer patient treated with anastrozole. We conclude that hormone therapy is a useful treatment for super-elderly postmenopausal women with estrogen receptor-positive breast cancer.