KRT1 and adenoid cystic carcinoma: However, quite recently Coletta et al. have demonstrated the importance of cytokeratins 1, 7 and 14 in the diagnosis of BSCC and Emanuel et al. have stressed the value of p63 in making a distinction between BSCC and adenoid cystic carcinoma of the head and neck, showing that p63 positivity is diffuse in BSCC and partial in adenoid cystic carcinoma [15, 20, 21].