There are as many types of cancer as there are different parts in a human body. Based on which part of the body the cancer occurs the cancer is named after that. For example if cancer appears in the blood then it is called blood cancer or leukemia. If it appears in the prostrate then you guessed it right it is called prostrate cancer. So that clearly tells you cancer is not a disease but something that no one has a clue about. According to the National Cancer Institute : “Cancer is a collection of related diseases in which some of the body’s cells begin to divide without stopping and spread into surrounding tissues.” Below are the list of most common types of cancer.