Prognostic immunohistochemical markers of primary human melanomas

Background Several clinical and histological factors of primary melanomas c omprise a relatively large quantity of prognostic information. Objective To find immunohistochemical markers that can improve the prognost ic accuracy achieved by factors that are available without extra laboratory work, i.e. mitotic rate. tumour thickness, ulceration, localization, gende r and age. Methods Immunohistochemical markers were determined on frozen sections. Uni variate and multivariate Cox regression analyses were performed after 5-10 years follow-up. Results Seven immunohistochemical markers were related to disease-free and overall survival in univariate Cox regression analysis: Ki-67, human leucoc yte antigen (HLA) -DQ, HLA-DP, Muc 18, A-10-33, transferrin receptor, and H -2-8-10. Only Ki-67 (n = 399) and HLA-DQ (n = 452) retained prognostic sign ificance when evaluated in multivariate analyses in several models together with tumour thickness alone and with tumour thickness, gender, mitotic rat e, age, localization and ulceration. Conclusions Ki-67 and HLA-DQ may be useful for risk assessments in primary melanomas.