“…Proportion of breast cancers 0.1% [1][2][3] 0.4% [4,5] 0.1 %-0.6% [1,6,7] 0.2%-0.6% [1,[8][9][10] Ͻ0.1% [11][12][13] 0.7% [1,14,15] 0.15% [16] Male incidence Case reports [2,[17][18][19] with aggressive disease in two cases [2,19], an unremarkable clinical course in a third [18], and limited data in a series [17] No male cases noted Rare male cases have been reported [20] No male cases noted Only female cases [21] 3.5% of cases are male [22] 0.2% of male breast cancers [23]; occurs in both genders in children, but more common in girls [24,25] Age, yrs Median, 58-66 [2,3,17,26,27] Mean, 52-61 [4,28,29] Median, 54-63 [1 ,6] Median, 47-61 [1, 8-10, 30- [48,49] May arise from preexisting benign apocrine epithelium [50]; microscopically cells have abundant foamy to granular eosinophilic cytoplasm and round nuclei with prominent nucleoli …”