Melanoma of palms, soles, and nail-beds.

The clinical and histological characteristics of palmar, plantar, and subungual melanomas treated in the division of plastic surgery of Helsinki University Hospital between 1970 and 1984 were analysed. The peak incidence was during the seventh decade of life, and the mean delay between the onset of symptoms and the diagnosis was one year. The delay was as much the fault of the physician as of the patient. The observed and relative five-year-survival rates for all 31 patients were 60% and 67%, and the 10-year-survival rates 39% and 49%, respectively. There were 15 cases of the acral lentiginous subtype, and the observed and relative five-year-survival rates were 65% and 71%, and the 10-year-survival rates 48% and 64%, respectively. For the nodular melanomas (n = 11) the survival rates were 53% and 60%, and 39% and 53%, respectively. For the three superficial spreading melanomas they were 50% and 52%, and 25% and 28%, respectively. Microstaging criteria (Breslow and Clark) were both good prognostic indicators. The series was too small for multivariate analysis.