Mesothelioma and Asbestos Exposure Asbestos exposure in the workplace is the most significant cause of mesothelioma. Exposure can occur in shipyards, factories mining sites, construction sites and mines. Asbestos fibers inhaled are stuck in the lining (pleura) of the lungs. They trigger gene mutations which cause cancer. The symptoms usually don't manifest until 20 to 60 ye
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