how many different type of cancer are there
List of cancer types This is a list of cancer types. Cancer is a group of diseases that involve abnormal increases in the number of cells, with the potential to invade or spread to other parts of the body.[1] Not all tumors or lumps are cancerous; benign tumors are not classified as being cancer because they do not spread to other parts of the body.[1] There are over 100 different known cancers that affect humans.[1]