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Korean Journal of Preventive Medicine 2002;35(1): 24-32.
Pesticides and Cancer Incidence: The Kangwha Cohort Study.
Jae Woong Sull, Sang Wook Yi, Tae Yong Sohn, Sun Ha Jee, Chung Mo Nam, Heechul Ohrr
1Department of Public Health, The Graduate School, Yonsei University, Korea.
2Department of Preventive Medicine and Public Health, College of Medicine, Yonsei University, Korea.
3Department of Health Management, Yuhan College, Korea.
4Graduate School of Health Science and Management, Yonsei University, Korea.
ABSTRACT
OBJECTIVE: Few studies have examined the relationship between the risk of cancer and exposure to pesticides in Korea or in other East Asian that have until recently used chlorophenoxy herbicides. The aim of this study was to evaluate the relationship between the exposure to pesticides and cancer incidence. METHODS: We conducted a prospective cohort study with a follow-up period of 13 years (1985-1998). The subjects included 2,687 male and 3,589 female Kangwha Island residents, Koreans aged fifty-five or more as of March 1985, who received a personal health interview and completed a health examination survey. A Cox proportional hazards models were used to estimate relative risks (RR). RESULTS: At baseline, the mean age of the study participants in 1985 was 66.4 for males and 67.1 for females. During the 13 years follow-up, a total of 300 incidents of cancer in males and 146 in females developed. In males, the total cancer incidence in the highest group was RR, 1.4 (95% CI=1.0-1.9), p for trend=0.041, for digestive organ cancer incidence in the highest group, RR, 1.5 (95% CI=1.0-2.3), p for trend=0.057, for stomach cancer incidence in the highest group, RR, 1.6 (95% CI=0.9-2.8), p for trend=0.094, for gallbladder cancer incidence in the highest group, RR, 9.1 (95% CI=1.1-77.0), p for trend=0.014 were elevated according to the higher frequency of pesticide use per year. In particular, the risk of gallbladder cancer was very high. Although not significant, the risk of liver cancer was higher than in the non-exposed group (in the highest group, RR, 2.0 (95% CI=0.7-5.9)). In females, although not significant, breast cancer incidence in the highest exposure group was higher than in the non-exposed group (in the highest group, RR, 4.7 (95% CI=0.8-27.9)). CONCLUSIONS: This study demonstrates that Korean farmers who use pesticides, particularly males, have a significantly higher total cancer incidence, particularly from digestive organ cancers such as, stomach, gallbladder, and liver cancer. In particular, the risk of gallbladder cancer was very high.
Key words: Cancer; Incidence; Pesticides; Gallbladder
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