[Locally Advanced Breast Cancer Successfully Treated with Abemaciclib and Fulvestrant-A Case Report].

A 78-year-old woman visited our hospital for a tumor in her left breast with discharge. The 10 cm tumor had ulceration and foul smell. Scirrhous breast carcinoma was diagnosed based on core-needle biopsy findings. Chest and abdominal computed tomography( CT) revealed the tumor invading the pectoralis major muscle and a large number of swollen lymph nodes from the left axilla to the subclavian region, but no distant metastases. After 6 months of locally advanced breast cancer treatment with abemaciclib and fulvestrant, ulceration improved. CT revealed that the tumor and lymph nodes tended to shrink. Left mastectomy with axillary lymph node dissection and combined resection of pectoralis major muscle was performed. Postoperative pathological histology revealed ypT2, ypN0, ypM0, ypStage ⅡA. Subsequently, abemaciclib plus fulvestrant therapy was continued as an adjuvant therapy. The patient has survived without recurrence 6 months after the operation. We report a case of locally advanced breast cancer in which abemaciclib and fulvestrant were effective.