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Pulmonary adenocarcinoma (a). Adenocarcinoma cells do not express HEG1 (b). Capillary endothelium and stromal cells show cytoplasmic HEG1 staining. Pulmonary pleomorphic carcinoma (c) with spindle‐shaped tumor cells showing granular cytoplasmic HEG1 staining (d). Ovarian serous carcinoma (e) showing membranous HEG1 staining (f). Thyroid papillary carcinoma (g) showing strong membranous HEG1 staining (h)
