Keywords: benign prostate hyperplasia finasteride male breast cancer a b s t r a c t Finasteride has been used for the treatment of benign prostate hyperplasia (BPH) for years, but some side effects, including male breast cancer (MBC), have been reported. We report a case of breast cancer in a male patient who received finasteride therapy for BPH, and to our knowledge, our report is believed to be the first in Taiwan. The patient was a 59-year-old man who received finasteride therapy for BPH

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... 4 years. He found a palpable mass in his left breast 2 months prior to diagnosis. Ultrasound-guided core biopsy showed invasive ductal carcinoma. A simple mastectomy was performed followed by chemotherapy with tamoxifen.