KLK3 and neoplasm: The tumor cells showed patchy positivity for cytokeratin 7 (CK7), strong cytoplasmic staining for alpha-methyl acyl-CoA racemase (AMACR), and were negative for PSA, cytokeratin 20 (CK20), GATA-binding protein 3 (GATA3), tumor protein 63 (p63), and caudal-type homeobox transcription factor 2 (CDX2).