KRT20 and neoplasm: The tumor cells were negative for cytokeratin, cytokeratin 7, cytokeratin 20, cytokeratin 5/6, cytokeratin 8/18, calretinin, WT-1, HMB45, Melan-A, MITF, P63, S100, TTF-1, PLAP, PSA, AFP, EMA, HSA, CD10, CD20, CD30, CD38, and CD45.