KRT5 and adenoid cystic carcinoma: All 4 adenoid cystic carcinomas cluster together in branch III and 5/7 of the apocrine tumors cluster together in branch V. All 18 tumors in branch II are positive for KRT5/6 staining, 97% of the tumors in branch I are EGFR negative, and all 14 tumors in branch V are KIT negative.