apocrine breast cancer

1. (A) Hematoxylin and Eosin slide of a case of invasive mammary carcinoma with apocrine morphology; The apocrine cells are negative for estrogen receptor [ER] (B) and progesterone
receptor [PR] (C) but positive for androgen receptor [AR] (D);
note the presence of ER and PR expression in adjacent normal ducts.