Mesothelioma is one cancer that has a generally accepted cause, that being exposure to asbestos fibers. Asbestos has been known as a hazardous material for some time, so attorneys have made a business out of seeking people that have succumbed to this cancer in order to sue those that may have caused the exposure.

The most salient facts that these lawyers try to find out are:
Your current medical condition, be that asbestosis or mesothelioma.
Your work history, eg jobs that might have had asbestos exposure situations.
Your prognosis, in order to determine an amount of future medical expenses.