As one of the rarest forms of cancer, asbestos cancer, which is formally called mesothelioma, is a condition that affects those who have been exposed to asbestos material. Although this product was common in the early portion of the 1900's, it is no longer in use legally within the United States. One of the most interesting features of this form of cancer is that it develops in the long term, with symptoms sometimes taking 30 or more years to be noticeable. It is a highly deadly form of cancer as well. Those who have exposure to asbestos material should contact a doctor as well as an attorney to determine if there is any legal responsibility on the behalf of someone else for the exposure.