Fig. 2.

Metastatic carcinoma cells from the right axillary lymphadenopathy (a–d, h). Low power view of hematoxylin and eosin staining (a). There was no ER (b) or PR (c) staining. HER2 staining showed a strong complete membranous pattern (d). Infiltrating ductal carcinoma cells from the left breast (e–g). ER (e) and PR (f) showed strong nuclear expression in most of the tumor cells. HER2 did not show any membranous staining (g). Metastatic carcinoma cells from the right axillary lymphadenopathy were positive for CK19 (h). Original magnification ×100 in a; Original magnification ×400 in b–h.