Although the incidence rate has increased over the past 20 years, mesothelioma is still a relatively rare cancer. The incidence rate of one per 1,000,000. Found the highest rate in the United Kingdom, Australia and Belgium: 30 1000000 a year.By comparison, populations with high incidence of smoking are lung cancer in May 1000 of more than 1,000,000. Incidence of malignant mesothelioma varies around 7 to 40 of 1000000 in the Western industrialized countries, depending on the size of the asbestos exposure of several decades.It is that the frequency can reach 15 1000000 the United States for 2004. The incidence should continue to grow in other parts of the world. Mesothelioma occurs more often in women than men and increased risk with age, but this disease can appear in either men and women of all ages. Approximately one fifth to one third of all mesotheliomas are peritoneal. Between 1940 and 1979, approximately 27.5 million people occupationally exposed to asbestos in States.Between 1973 and 1984, three times more in the diagnosis of pleural mesothelioma in Caucasian males. From 1980 until the end of 1990-year of mesothelioma mortality in the United States has increased from 2000 to 3000, with four times more men than women. This award May not be accurate, because many cases of mesothelioma are misdiagnosed as adenocarcinoma of the lung, which is difficult to differentiate from mesothelioma.