Melanoma is a disease entity that has the capability of involving all organ systems of the human body. During the last decade a dramatic increase in the incidence of this disease has been noted. It is surpassed in this dreadful statistic only by carcinoma of the lung. During this time frame, much has been defined and written concerning the histopathology and prognostic fac tors of this neoplastic disorder. The relative ease of maintaining this malig nant cell in tissue culture has permitted the cellular biologist, tumor immu nologist, immunochemist and geneticist an ideal in vitro...