HLA antigen expression in melanocytic lesions: Is acquisition of HLA antigen expression a biomarker of atypical (dysplastic) melanocytes?

The data presented suggest that HLA antigen expression is an objective biomarker that correlates well with the degree of cytologic atypia in AN and may: (1) be useful to distinguish common nevi from AN, and (2) represent a more objective measure to determine which AN should be excised.