Asbestos-Related Mesothelioma: Epidemiological Evidence for Asbestos as a Promoter

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Abstract
A series of 144 cases of mesothelioma among asbestos workers indicated important divergences from the epidemiological pattern shown to exist for asbestos-related lung cancer. Consideration of exposure duration and intensity and the latent period between first exposure and death suggests that asbestos does not act as a complete carcinogen, but as a promoter. A threshold seems probable for both duration and intensity of exposure in the induction of mesothelioma. This threshold may, in part, be related to the passage of fibers from the lungs to the pleura or peritoneum, and would, in any case, be masked in lung cancer by the retention of asbestos in the lungs. Reported cases of mesothelioma in immediate family members indicate the existence of an additional factor in mesothelioma induction, acting earlier in life than the first asbestos exposure.

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