Thursday, November 10, 2016

Prognosis and Epidemiology Mesothelioma

Prognosis

Mesothelioma has a poor prognosis. The median survival time for pleural mesothelioma is 12 months from diagnosis. Women, young people, people with low-stage cancers, and people with epithelioid cancers have better prognoses.

Prognosis and Epidemiology Mesothelioma

Negative prognostic factors include sarcomatoid or biphasic histology, high platelet counts (above 400,000), age over 50 years, white blood cell counts above 15.5, low glucose levels in the pleural fluid, low albumin levels, and high fibrinogen levels. Several markers are under investigation as prognostic factors, including nuclear grade, and serum c-reactive protein. Long-term survival is rare.


Pericardial mesothelioma has a 10-month median survival time. In peritoneal mesothelioma, high expression of WT-1 protein indicates a worse prognosis.

Epidemiology

Although reported incidence rates have increased in the past 20 years, mesothelioma is still a relatively rare cancer. The incidence rate varies from one country to another, from a low rate of less than 1 per 1,000,000 in Tunisia and Morocco, to the highest rate in Britain, Australia and Belgium: 30 per 1,000,000 per year.

For comparison, populations with high levels of smoking can have a lung cancer incidence of over 1,000 per 1,000,000. Incidence of malignant mesothelioma currently ranges from about 7 to 40 per 1,000,000 in industrialized Western nations, depending on the amount of asbestos exposure of the populations during the past several decades.

Worldwide incidence is estimated at 1-6 per 1,000,000.[5] Incidence of mesothelioma lags behind that of asbestosis due to the longer time it takes to develop; due to the cessation of asbestos use in developed countries, mesothelioma incidence is expected to decrease.

Incidence is expected to continue increasing in developing countries due to continuing use of asbestos. Mesothelioma occurs more often in men than in women and risk increases with age, but this disease can appear in either men or women at any age.

Approximately one fifth to one third of all mesotheliomas are peritoneal.[citation needed] Less than 5% of mesotheliomas are pericardial. The prevalence of pericardial mesothelioma is less than 0.002%; it is more common in men than women. It typically occurs in a person's 50s-70s.

Between 1940 and 1979, approximately 27.5 million people were occupationally exposed to asbestos in the United States.

Between 1973 and 1984, the incidence of pleural mesothelioma among Caucasian males increased 300%. From 1980 to the late 1990s, the death rate from mesothelioma in the USA increased from 2,000 per year to 3,000, with men four times more likely to acquire it than women.[citation needed] More than 80% of mesotheliomas are caused by asbestos exposure.

The incidence of peritoneal mesothelioma is 0.5–3.0 per million per year in men, and 0.2–2.0 per million per year in women.

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