What causes Mesothelioma?

Exposure to asbestos is responsible for up to 9 out of 10 mesothelioma cases. There are thought to be other rare causes of the disease but none are fully understood at this time. The disease has been described in medical literature since 1870 although the first suspicion linking asbestos and mesothelioma did not appear in the U.K. until 1935 and a definite link was not reported until 1960. Source: http://www.mesothelioma.uk.com/index.php?pageno=127&sub=18