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TTF1 expression in non-pulmonary carcinoma.
A-C: Metastasis of ovarian endometrioid carcinoma to the lung (A) expresses PAX8 (B) and TTF1 (clone SPT24, C). The diagnosis was confirmed with identical KRAS mutation (G12A) between lung and ovarian cancer.
D-F: Lymph node metastasis of mammary invasive ductal carcinoma (D) displays dual expression of ER (E) and TTF1 (clone SPT24, F).
