<prompt> True about male breast cancer is all except:-Less than 2 of all cases of breast cancerMost commonly it is infiltrating lobule carcinomaGynaecomastia is not a risk factorExocrine or endocrine estrogen exposure can predispose to it  <response>: Lobular carcinomaboth in-situ invasive is rarely seen due to absence of lobules in males. Most common variety is infiltrating ductal carcinomaQ. PREDISPOSING FACTORS Excess endogenous or exogenous estrogenTesticular disease,infeility, obesity, cirrhosisQ Radiation therapy, Klinefelters syndrome and testicular feminizing syndromesQ. BRCA2 mutationsQ Gynecomastia is not a risk factor for carcinoma male breastQ. 