PMEL and neoplasm: Tumor cells were negative for CD117, CD34, DOG1, Desmin, S100, HMB45, STAT6, Arginase1, keratin20, keratin5/6, keratin7, PAX8, Synaptophysin (Syn), Thyroglobulin (TG), TTF1, Glypican3, Villin, and SDHB.