Cancer Center Types, Symptoms, Causes, Tests, and Treatments Cancer, also called malignancy, is an abnormal growth of cells There are than types of cancer, including breast cancer, skin cancer, lung cancer, colon cancer, prostate cancer, and Cancer Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body These contrast with benign tumors, which do not spread. Comprehensive Cancer Information National Cancer Institute Colorectal Cancer Information about colon and rectal cancer treatment, causes and prevention, screening, and . Cancer Causes, Types, Treatment, Symptoms Signs Cancer is the uncontrolled growth of abnormal cells anywhere in a body These abnormal cells are termed cancer cells, malignant cells, or tumor cells These cells can infiltrate normal body tissues. Cancer MedlinePlus Cancer begins in your cells, which are the building blocks of your body Normally, your body forms new cells as you need them, replacing old cells that die. American Cancer Society Information and Resources about for Get everything you need to know about cancer, from the basics to detailed information on than different cancer types.