WT1 and neoplasm: Immunohistochemical staining showed that the tumor cells were strongly positive for ER (90%) (Figure 2a), PR (90%) (Figure 2b), CK7 (100%) (Figure 2c), TRPS1 (100%) (Figure 2d), GATA3 (90%) (Figure 2e), WT1 (100%) (Figure 2f, and Ki-67 (30%) (Figure 2g), and focally positive for synaptophysin (Syn) (1%) (Figure 2h), while negative for P63 (Figure 2i).