Basics of Mesothelioma An abnormality in mesothelioma cells causing them to divide uncontrollably leads to mesothelioma. It can be either non-cancerous or cancerous. It is known as a malignant form of mesothelioma when it is cancerous and when it is non-cancerous it is kno... 05-17-2008 and 2 others Tags cancer, mesothelioma, mesothelioma lawyer, mesthelioma info