What is mesothelioma?

According to the Centers for Disease Control and Prevention, "Asbestos exposure is by far the leading cause of malignant mesothelioma, a rare form of cancer found in the sac lining the chest (the pleura) or the abdomen (the peritoneum). In 1999, 2,485 deaths were recorded with malignant mesothelioma listed as an underlying or contributing cause. Of these, 1,773 deaths were classified as unspecified. The highest malignant mesothelioma mortality rates occurred in Alaska and Maine. Men accounted for 80.3 percent of the deaths from malignant mesothelioma, and white U.S. residents accounted for 94.8 percent of these deaths. Industrial and miscellaneous chemicals had the highest proportionate mortality ratio (PMR) for malignant mesothelioma among the industries. Occupations with the PMRs were plumbers, pipefitters, and steamfitters; electricians; and elementary school teachers."