Fig. 2

Histopathological findings of bilateral breast cancers. The right breast cancer is shown in a–e, and the left breast cancer is shown in f–j: hematoxylin-eosin staining (a, f), ER (b, g), PgR (c, h), HER2 (d, i), and Ki-67 (e, j). Immunohistochemical staining results were ER, 5; PgR, 4; HER2, 2+; and Ki-67, 35.6% for the right lesion, and ER, 5; PgR, 1; HER2, 2+; and Ki-67, 20% for the left lesion