[Mitotic regimen in skin tumors]

The results of the study of mitotic regimen (mitotic activity, ratio of mitotic phases, and percentage of pathological mitoses) in basal cell papilloma, basalioma, pigmented nevus and melanoma are presented. Differences in the mitotic regimen in basal cell papilloma and basalioma were observed consisting in a two-fold increase in the number of pathological mitoses in basalioma as compared with basal cell papilloma, all other indices of the mitotic regimen being similar. Marked differences in all parameters of the mitotic regimen were observed in pigmented nevus and melanoma: a considerable increase in mitotic activity, the number of pathological mitoses and the number of metaphases in melanoma.