Defined as a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body. These contrast with benign tumors, which do not spread. These disease has several variants including colon cancer, brain tumor, leukemia etc. for so long now the disease cannot be said to have cure but rather chemotherapy which only happen before it gets to stage 4. What really cause cancer and how comes nobody has discovered how it comes about.