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- W1973993487 abstract "This paper investigates the effects of air pollution in urethane-induced lung tumours in mice by means of histological, morphometrical, and DNA ploidy. The experimental exposure was done in locations with different air pollution profiles: a polluted area (downtown São Paulo) and a clean environment. Swiss mice were employed and urethane (3 g/kg) was used as a carcinogenic substance. All the animals, whether exposed or not to air pollution, were sacrificed after 6 months, and the lung lesions were analysed. The results showed a significant effect of air pollution on tumour progression, observed by changes in the phenotype of the tumour cells as demonstrated by morphometry and DNA ploidy. We observed more atypical adenomas in the air pollution-exposed group (p = 0.02). Coherently, morphometric differences were also detected between the two groups. Neoplasms of exposed mice exhibited an increase in the nuclear fraction (p = 0.002) and in the nucleus/cytoplasm ratio (p = 0.011), as a decrease in the stromal fraction (p < 0.001). There was a higher risk of aneuploidy in the 6-months-of-air-pollution-exposure group (relative risk: 1.58; 95% of confidence interval: 1.007 to 2.403). These results indicate that urban air pollution accelerates the process of progression towards malignancy." @default.
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- W1973993487 date "2000-01-01" @default.
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- W1973993487 title "Urban levels of air pollution modifies the progression of urethane-induced lung tumours in mice" @default.
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- W1973993487 doi "https://doi.org/10.1016/s0344-0338(00)80006-0" @default.
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