RESUMEN
Objective To explore the relationship between organochlorine pesticides exposure after Tangshan earthquake and the breast cancer. Methods 1∶1 matched case-control study was conducted in 150 newly diagnosed cases of breast cancer with histopathological diagnosis from three city-level hospitals in Tangshan,China and 150 matched controls at the same hospitals,without the related diseases. The levels of derivatives of DDT and HCH in serum were measured by gas chromatography (GC) method and epidemiological survey were conducted by questionnaire for 150 pairs of cases and controls. The relationship between the organochlorine pesticides metabolites and the breast cancer of the exposed population was analyzed by conditional logistic regression model by SAS 8.2 Software. Results Compared with the control,significant higher rates of detection of p,p'-DDD and o,p'-DDT were seen in the case group and the levels of p,p'-DDE,?-HCH and ?-HCH in serum were higher in the case group,and there was a significant difference in serum residues levels of ?-HCH,p,p'-DDE and o,p'-DDT in different exposure areas in Tangshan,the high exposure area showed higher residues levels than the low exposure area. Multivariate conditional logistic regression analysis showed high pesticides exposure after the earthquake,the serum residues of p,p'-DDE and p,p'-DDT were associated with breast cancer risk,ORs were 6.592(95%CI:1.402-31.002),2.405(95%CI:1.033-5.600)and 1.845(95%CI:1.028-3.353) respectively. Conclusion Exposure to environmental organochlorines may be one of the risk factors for breast cancer; Higher pesticides exposure after the earthquake may increases breast cancer risk in Tangshan area.
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Objective To explore the relationship between dietary factors and female breast cancer. Methods A 1∶1 matched case-control study was conducted in 175 cases with histopathological diagnosis and 175 matched controls(Apr.2004 to Jul.2005), a questionnaire about general information and dietary intakes over 10 years was used in the present investigation. Results The univariate conditional analysis showed that high intake times of fruits, vegetables and soybean food were the protective factors and the relationship between intake frequencies of fruits, vegetables and soybean food intake and breast cancer showed a dose-response manner. The multivariate analysis showed that psychological hurt was the risk factors, high vegetables and soybean food intake and more delivery times were the protective factors. Conclusion High intake times of vegetables and soybean food are the protective factors for female breast cancer.