[Endomitosis in pigmented neoplasms of human skin]

The types of cell division in the human cutaneous pigmented nevi have been studied on histological sections. This study has shown that endomitosis is the basic method for division of 229115 cells in pigmented nevi (0.75%); in 101140 cells of nevi with malignancy--1.15% of the endomitotically dividing nuclei and 0.202% of the mitotically dividing ones, in 180000 cells of malignant melanomas endomitoses amount to 0.238% and mitoses--to 0.369%. The presence of endomitoses correlates with appearance of multinuclear cells near those nuclei.