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According to a newspaper account for the epidemic occurrence of cancer patients at an area of Pukcheju-gun, epidemic survey was conducted to identify the epidemicity and possible cause of the cancer epidemic from Sep. 23, 1993 to Sep. 28, 1993. Housefold survey for identifying prevalent There was no female cancer cases, no temporal dusting pattern of cancer occurrence and no clustering of specific types of cancer. In the evaluation of ground water and sea water, carcinogenic substances were not detected. According to the above evidences, it was difficult to confirm that there was an epidemic occurrence of cancer at the area. And the possibility of the association of environmental carcinogenic factors with the cancer occurrence seemed to be very low.