The immunohistochemical panel showed reactivity to cytokeratin (CK)7, CKAE6/AE7, carcinoembryonic antigen, octamer-binding transcription factor 4, cluster of differentiation (CD)20, CD3, vimentin, muscle actin, and <i>pituitary tumor-transforming gene 1</i> in isolated cells. The gene discussed is CEACAM5; the disease is pituitary tumor.