Mesothelioma is a cancer that is closely associated to exposure to asbestos fibers, either through work-related exposure or through close association to someone who is exposed to asbestos. The two most common forms of Mesothelioma are pleural and abdominal mesothelioma. Unfortunately, many people are diagnosed in the late stages of the illness, resulting in a poor Mesothelioma prognosis, particularly if diagnosed in stage three or four of the illness.