Statistical Study on Malignant Melanoma in Japan (1970-1976)

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Abstract
In 1972 a statistical study based on 501 cases of malignant melanoma was reported and as continuous study this review was carried out on 456 cases of melanoma which were reported during 6 yr between 1970-1976. These 2 studies showed quite similar results. Yearly incidence of malignant melanoma indicated a definite upward trend, the average number of patients was 71.1/yr. Distribution by age showed 1 peak in the 7th decade and the sex ratio was 1.1:1. The number of cases per total population in Japan showed a great increase in those over the 5th decades and 2 peaks in the 7th and 8th decades. The average age of the onset of all melanoma was 51.6 yr, while that of brain and spinal cord melanoma was 25.4 yr. In the skin melanoma with preexisting pigmented skin lesions, the median age of the onset of primary melanoma on the foot was 38.7 yr and that of originated melanoma except the foot was 65.9 yr. Incidence of the melanoma was high in the sole considering the number of melanocytes per unit skin area. Metastasis of eye melanoma was low (23%).

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