SYP and neoplasm: Immunohistochemical studies reveal that tumor cells are positive for CD10, CD56 and vimentin but negative for cytokeratin (AE1/3 and CAM5.2), sex cord-stromal markers (SF1, inhibin, and calretinin), neuroendocrine biomarkers (synaptophysin, chromogranin and INSM1) and hormone receptors (ER, PR and AR).