TTF1 and neoplasm: Tumor cells were positive for Hep Par-1 and glypican-3 (Fig. 4), and negative for cytokeratin (CK) 7, CK20, thyroid transcription factor 1 (TTF-1), inhibin, OCT3/4, prostate-specific antigen (PSA), prostatic specific acid phosphatase (PSAP), renal carcinoma marker (RCC), and PAX8.