[Familial malignant melanoma and its relation to dysplastic nevus syndrome: considerations on 6 clinical cases].

Two cases of familial expression of malignant melanoma are presented, with regard to three patients recently operated on for this neoplasm. The authors review the literature existing on this subject and make important comments about some hereditary factors probably predisposing to malignant melanoma; among these characteristics are the pigmentary traits of skin, adnexa and iris, the so-called "dysplastic" or "atypical" moles, the cutaneous sensitivity to the sun.