Estrogen Receptor Staining in Breast Cancer
Question: I recently had a breast biopsy with invasive ductal carcinoma, grade 3 and ductal carcinoma in situ. My report said “the carcinoma is estrogen and progesterone receptor negative (<5%) and negative for her2/neu over-expression (1+).” I read online that sometimes even less than 5% could still be positive for the estrogen receptor. [...]

