Immunohistochemical staining for hematopoietic lineage cell-specific protein 1 expression in (A) serous carcinoma, (B) clear cell carcinoma, (C) mucinous carcinoma and (D) endometrioid carcinoma. As indicated by numbers 0–3 in the images, immunoreactivity was scored as follows: 0, negative staining; 1, weak staining; 2, intermediate staining; and 3, strong staining. Scale bar, 20 µm.