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MALIGNANT SKIN TUMORS AMONG DERMATOLOGY PATIENTS IN UNIVERSITY HOSPITALS OF JAPAN
Author(s) -
Tada Masanori,
Miki Yoshiharu
Publication year - 1984
Publication title -
the journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 65
eISSN - 1346-8138
pISSN - 0385-2407
DOI - 10.1111/j.1346-8138.1984.tb01484.x
Subject(s) - medicine , dermatology , incidence (geometry) , xeroderma pigmentosum , basal cell carcinoma , scars , basal cell , actinic keratoses , melanoma , pathology , dna , physics , genetics , cancer research , biology , optics , dna damage
A total of 829 patients with squamous cell carcinoma (SCC), 942 patients with basal cell carcinoma (BCC) and 256 patients with malignant melanoma (MM) was encountered among 1,033,678 new dermatology patients in 44 of 46 university hospitals of Japan between 1971 and 1975. The incidences of skin cancers (SCC and BCC) and of MM among new dermatology patients were 0.171% and 0.025% respectively. The incidences had increased 2 to 2.5 times over those of the previous survey between 1956 and 1960. Skin cancers were most frequently seen among those over 60 years of age and on exposed sites. Burn scars, chronic radiodermatitis, traumatic scars and xeroderma pigmentosum were common preceding diseases in skin cancers, although the majority of the cancers were without apparent preceding diseases. The incidence of skin cancers on exposed sites without preceding diseases showed a statistically significant exponential correlation with the decreasing degrees of the Northern Latitude (NL) of the university locations. The incidence of MM was most common on the extremities and showed no such geographic correlation.