Male Patients with Diagnoses of Both Breast Cancer and Prostate Cancer

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Abstract
Recently cancer susceptibility syndromes have been characterized that suggest possible genetic linkages between breast cancer and prostate cancer within families. Despite these connections, male breast cancer and prostate cancer in an individual man has rarely been reported. The clinical features of 10 patients with both of these cancers are described here. One hundred sixty‐one patients with male breast cancer were seen at the Dana‐Farber Cancer Institute and Massachusetts General Hospital between 1977 and 2000. Of these, 10 were identified who also had prostate cancer. A retrospective review of records from these 10 patients was performed. Breast cancer preceded prostate cancer in eight of these men. The mean age of diagnosis of breast cancer was 65.7 years (range 47–72 years). Twenty percent had nodal involvement at diagnosis and two patients ultimately developed evidence of metastatic disease. The mean age of diagnosis of prostate cancer was 68.0 years (range 51–76 years) with a median prostate‐specific antigen (PSA) level at diagnosis of 6 ng/ml (range 1.8–47.5 ng/ml). Seven patients had a family history of female breast cancer in a first‐degree relative, while one had a family history of prostate cancer. At a median follow‐up of 6.5 years from initial cancer diagnosis, one patient had died of metastatic breast cancer and another had died of metastatic prostate cancer. The clinical features and course of the breast cancers diagnosed in this series do not appear significantly different from those described for the general population of male breast cancer patients. In addition, these men do not appear to develop prostate cancer at an earlier age or more aggressive stage than the general population.