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The rapidly growing collection of diverse genome-scale data from multiple tumor types sheds light on various aspects of the underlying tumor biology. With the objective to identify genes of importance for breast tumorigenesis in men and to enable comparisons with genes important for breast cancer development in women, we applied the computational framework COpy Number and EXpression In Cancer (CONEXIC) to detect candidate driver genes among all altered passenger genes. Unique to this approach is that each driver gene is associated with several gene modules that are believed to be altered by the driver. Thirty candidate drivers were found in the male breast cancers and 67 in the female breast cancers. We identified many known drivers of breast cancer and other types of cancer, in the female dataset (e.g.  GATA3 ,  CCNE1 ,  GRB7 ,  CDK4 ). In contrast, only three known cancer genes were found among male breast cancers;  MAP2K4 ,  LHP , and  ZNF217 . Many of the candidate drivers identified are known to be involved in processes associated with tumorigenesis, including proliferation, invasion and differentiation. One of the modules identified in male breast cancer was regulated by  THY1 , a gene involved in invasion and related to epithelial-mesenchymal transition. Furthermore, men with  THY1  positive breast cancers had significantly inferior survival.  THY1  may thus be a promising novel prognostic marker for male breast cancer. Another module identified among male breast cancers, regulated by  SPAG5 , was closely associated with proliferation. Our data indicate that male and female breast cancers display highly different landscapes of candidate driver genes, as only a few genes were found in common between the two. Consequently, the pathobiology of male breast cancer may differ from that of female breast cancer and can be associated with differences in prognosis; men diagnosed with breast cancer may consequently require different management and treatment strategies than women.

The Landscape of Candidate Driver Genes Differs between Male and Female Breast Cancer