Cancer, also called malignancy, is an abnormal growth of cells. There are more than 100 types of cancer, including breast cancer, skin cancer, lung cancer, colon cancer, prostate cancer, and lymphoma. Symptoms vary depending on the type. Cancer treatment may include chemotherapy, radiation, and/or surgery. Cancer is the No. 2 killer in America, second only to heart disease. What can you do to reduce your chances of getting this deadly condition? You have more control than you might imagine.