Lung, breast, and colon cancer are the most frequent cancers of this type in the United States. Sarcomas start in cells found in the supporting tissues of the body such as bone, cartilage, fat, connective tissue, and muscle. Lymphomas begin in the lymph nodes and tissues of the body's immune system. Leukemias are cancers of the immature blood cells that grow in the bone marrow and can accumulate in large numbers in the bloodstream. A carcinogen is a substance that can cause cancer.
Some people are more susceptible to carcinogens than others.
In addition, cancer can be more likely to develop when the immune system isn't functioning properly. The American Cancer Society says many forms of cancer are treated most successfully when caught early. This is why regular screenings, such as Pap tests, mammograms, PSA tests, etc., are so important. If such screenings find a suspicious area, a biopsy can be performed, so the tissue can be examined more closely. This helps the doctor determine at what stage the cancer is, and how best to treat it.