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Malignant melanoma even now remains the most fatal type of tumor and number of patient is still increasing year by year. The Prognosis and Statistical Investigation Committee of the Japanese Society for Skin Cancer has periodically conducted a nationwide survey of skin malignancies. We investigated 4, 495 cases of malignant melanoma from 431 fascilities from 1992 to 1998 this time.This report was finally summarized in December 1999. It demonstrates the number of the patients by each year and gender.It shows that number of patient is actually increasing, and this is more significant in female patients. Skin Cancer (Japan) 2000; 15: 7-14
和之 et al. (Sat,) studied this question.