Fig. 2

Preoperative pathorological findings. The histopathological findings of the right breast from core needle biopsy (a, f: hematoxylin and eosin (HE) × 40; b, g: HE × 200). Immunohistochemistry study for AE1/AE3, estrogen receptor (ER), and HER2 (c, h: AE1/AE3 × 40; d, i: ER × 40; e, j: HER2 × 40). Small foci of atypical ductal cells are recognized (yellow arrow). Partial coagulation necrosis is generated in estrogen receptor-negative, HER2-negative, and AE1/AE3-positive ductal carcinoma without infiltration of lymphocytes