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Purpose: the natural environment by collecting crocidolite exposed areas of Cancer Mortality and its influencing factors data and appropriate statistical analysis, to provide a scientific basis for future research and intervention strategies formulation. Methods: The study was a 26-year retrospective cohort investigation and research on the basis of investigations in the past carried out on fixed queue. Dayao County crocidolite is selected exposed serious Jinbi, New Street, two, 16 villages were randomly selected for the survey points, survey of the farmers in 1984 in 16 villages, more than 20 years old, the history of 26 years of follow-up in 2010 January for its follow-up investigation. Members of the investigation into the column or not alive during the observation period, died in January 2010 as a research object and for different circumstances to carry out the health questionnaire investigation or inquest, the use of a retrospective cohort study method of low doses of crocidolite exposure on health effects of hazards and risk factors analysis. Fill out the the residents form health survey \time, tumor VA, Scale) and demographic characteristics (name, age, gender, ethnicity, occupation, education level, marital history, family income, etc.), the main exposure factors and related factors crocidolite exposure (drinking water exposure, production The chi-square test and non-conditional logistic regression model analysis, screening of risk factors associated with malignancies affecting the region. Results: observe the the queue total of 804 people, including 356 men, 448 women, the total number of man-years of follow-up to 17,724.00 person-years, of which 243 people have died, accounting for 30.22% of the objects of the follow-up. 42 people died of cancer in the queue, the total mortality rate was 236.97/10 people. Cancer Mortality in the first pick is the liver, a total of 10 people died of liver cancer, the crude death rate of 56.42/10 million years, 24% of the total cancer death. 2 lung malignant (without pleural mesothelioma), a total of nine people, the crude death rate of 50.78/10 million years. Gastric cancer and colorectal cancer mortality are 33.85/10 million years, cervical cancer, crude death rate of 11.28/10 million years, the pleural mesothelioma crude mortality rate of 11.28/10 million. Gastrointestinal malignancies serious harm to the health of local residents has become the first types of cancer, liver cancer, colorectal cancer, and gastric cancer, and more than half of the cancer deaths (53%). The report was the study of the history of occupational exposure to crocidolite 38 patients died of cancer, 93 patients died of other causes, the study of the history of exposure to crocidolite 4 patients died of cancer, 100 patients died of other causes. Χ2 = 43.389, P lt; 0.001, that the difference was statistically significant. The Logstic analysis showed that, in the case of other independent variables fixed, crocidolite history of exposure to people suffering from malignant likelihood of death about no of crocidolite contact history 10.215 times. Conclusion: minimum national cancer mortality Yunnan, Dayao County, Yunnan exposure to crocidolite District malignancy crude mortality not only higher than that of Yunnan level, it is far more than the national average. Liver cancer, lung cancer, stomach cancer, colon cancer, cervical cancer, pleural mesothelioma and other malignancies were higher than in Yunnan and the national average, and was no significant difference by gender, economic level, smoking, alcohol consumption and other factors, which We speculate that the long-term environmental crocidolite low dose exposure may increase the risk of cancer death. Recommendation: 1, take a variety of means, multisectoral cooperation, coping the Dayao county crocidolite environmental pollution. 2, to strengthen the Dayao county crocidolite environmental exposure concentration monitoring. 3, to improve Dayao County crocidolite exposed area road traffic and water conditions. 4, intensify propaganda of crocidolite exposure area residents to carry out health education, to raise residents' awareness of self-protection. Further exploring the the crocidolite environment low dose exposure and the strength of the association between tumor.
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