SCIENTIFIC Studies

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  • Mortality from Occupational Exposure to Relatively Pure Chrysotile: A 39-Year Study

    09/10/2008 14:36:00

    Sichletidis studied the disagreement that exists regarding the relationship between chrysotile exposure and mesothelioma or lung cancer. To do this he looked at the cause of death in workers who had been exposed to relatively pure chrysotile in an asbestos cement factory where the asbestos fibre concentration was always below permissible levels. The date and cause of death were recorded for active and retired workers. Fifty-two workers died during the study, 28 from cancer of which 16 had lung cancer. No case of mesothelioma was reported. The authors concluded that occupational exposure to relatively pure chrysotile within permissible levels was not associated with a significant increase in lung cancer or with mesothelioma.

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  • Chrysotile as a Cause of Mesothelioma: An Assessment Based on Epidemiology

    06/01/2006 12:14:00

    One of the most important, recent, epidemiological papers is by Yarborough. His study not only shows that: “[A] review of 71 asbestos cohorts exposed to free asbestos fibers does not support the hypothesis that chrysotile, uncontaminated by amphibolic substances, causes mesothelioma. He also notes that failure to resolve the debate has hampered proper risk assessments: “A firm understanding of any health risks associated with natural chrysotile fibers is crucial for regulatory policy and future risk assessments of synthesized nanomaterials.” The paper underlines that the current mess of regulations and mis-understanding is a reflection of public policies not science.

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