“…These include neuroendocrine markers (synaptophysin, chromogranin, neuronspecific enolase, CD56, and CD57), estrogen receptor, progesterone receptor, epithelial markers (CK7, Cam5.2, epithelial membrane antigen, CK5/6, CK8, and CK18), and gross cystic disease fluid protein-15. 2,5,6,[11][12][13] CEA, CK20, TTF-1, and CDX2 are reported to be negative in such tumors. 2,5,6,[11][12][13] Our immunohistochemical results enforce these findings, though it did not cover the entire immunohistochemical list.…”