There are over 200 different types of cancer. Each type is named for the particular organ or tissue that is infected with the disease. Cancer has been grouped into four main categories. Carcinomas are cancers that are found in the external or internal coverings of the body, such as the skin or the lining of the intestine. Sarcomas are found in tissues that support the body, such as bone or muscle.
Leukemias affect the blood forming tissues of the body, such as bone marrow and the spleen.
Lymphomas are cancers of the lymphnodes. Common types of cancer in humans are breast, lung, skin, testicular, prostate, brain, ovarian, and stomach cancer. Some of these are more treatable than others due to research, their location in the body, and their function in the body.