Abstract
A survey of malignant tumors was carried out by reviewing the outpatient records from 1986 to 1995 of the Department of Dermatology, Juntendo University Urayasu Hospital. Recorded malignant tumors included basal cell carcinoma (BCC), squamous cell carcinoma (SCC), malignant melanoma (MM), Paget's disease and Bowen's disease.1)The total number of patients with malignant tumors was 96 and the average incidence was 0.23%.2) The age distribution of BCC peaked in those patients in their sixties, and peaks for SCC and Bowen's disease were in the seventies.The male/female ratio of malignant skin tumor patients was 1:1 for BCC and SCC, and 1: 2.56 for Bowen's disease.3)Our present study's site distribution of Bowen's disease, BCC and SCC resembled those of past reports in Japan between 1981 and 1995.4) We compared our present study with Tada's statistical survey between 1971 and 1995. We found that the incidence of BCC, SCC and MM in our present study was less than that of Tada's statistical survey, especially with respect to SCC.5) The average BCC/SCC ratio in nine hospitals in Japan was 1.67.
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