PLAG1 and melanoma: Stains for S100 protein (marker for melanoma or nerve sheath tumors), CEA (nonspecific marker for colorectal, pancreatic, gastric, breast, or thyroid cancers), and PLAG1 (pleomorphic adenoma) were negative, while there was equivocal positivity for MYB (proto-oncogene for leukemia), which was confirmed to be negative with fluorescence in situ hybridization (FISH) testing.