You would’ve already been familiar with these words called benign and malignant. They are used extensively in cancer related terms. Basically cancer would be associated only with malignant tumor.A tumor can be either benign or malignant.A benign tumor is not much of a worry as it is not going to cause any significant problems to us and it can be easily treated upon.Whereas, the malignant ones are the ones that cause cancer.They multiply rapidly, spread to other organs and spread the disease to other parts.Same is the case with malignant Mesothelioma.If it is malignant Mesothelioma treatment, you certainly have to take treatment ASAP as it can turn fatal if overlooked.