Immunohistochemical tumor markers are proteins that help doctors tell the difference

between different types of cancer. Mesothelioma-related proteins such as calretinin, WT-1

and podoplanin help pathologists differentiate mesothelioma from other cancers such as lung

cancer.A positive test result means that the laboratory found a particular change in the

proteins of your tumor. This means that it is possible that you have an inherited genetic

condition and further genetic testing is recommended.