Male Breast Cancer: Immunohistochemical Subtypes and Clinical Outcome CharacterizationSánchez-Muñoz A. · Román-Jobacho A. · Pérez-Villa L. · Sánchez-Rovira P. · Miramón J. · Pérez D. · Sáez M.-I. · de Luque V. · Medina L. · Ramírez-Tortosa C.L. · Vicioso L. · Medina J.A. · Ribelles N. · Alba E.
aMedical Oncology Service and Departments of bRadiation Oncology and cPathology, Hospital Universitario Virgen de la Victoria, Málaga, dMedical Oncology Service and eDepartment of Pathology, Complejo Hospitalario de Jaén, Jaén, fMedical Oncology Service, Hospital de la Serranía, Ronda, and gMedical Oncology Service, Hospital Costa del Sol, Marbella, Spain
Aim: The aim of this study was to assess the molecular subtype profiles of male breast cancer (MBC) and subsequent clinical outcome using a validated 6-marker immunohistochemical panel. Methods: A total of 43 cases of MBC were examined retrospectively using a semiquantitative immunohistochemical analysis of estrogen receptor (ER), progesterone receptor (PR), Ki-67, human epidermal growth factor receptor 2 (Her2), epidermal growth factor receptor and cytokeratin 5/6. Patients were classified into the following categories: luminal A, luminal B, Her2-positive or basal-like subtypes. Results: The median age of patients was 63 years (r: 32–89). The predominant histology was invasive ductal carcinoma (91%). Only 1 patient had advanced breast cancer at diagnosis. Ninety-three percent were ER-positive and 84% were PR-positive. Two patients had tumors that were ER- and PR-negative. The distribution of tumor molecular subtypes was 19 (44%) luminal A, 22 (51%) luminal B and 2 (5%) basal-like. The Her2-positive tumor subtype was not identified. The clinicopathological characteristics did not differ significantly between tumor subtypes A and B. There were no significant differences in 6-year disease-free survival (74 vs. 82%, p = 0.77) or overall survival (74 vs. 82%, p = 0.69) between luminal A and luminal B subtypes, respectively. Conclusion: The most common subtypes in our cohort of MBC were luminal B followed by luminal A, and no differences were found between both tumor subtypes in terms of clinicopathologic characteristics and patient outcome.
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