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National Institutes of Health (NIH) defines cancer as a disease in which abnormal cells divide without control and then invade nearby tissue. NIH reminds us that cancer cells can spread to various parts of the body through the bloodstream and the lymph system. There are more than 100 types of cancer, including cancers that begin in the tissues that make blood, such as leukemia, skin cancers, such as carcinoma, and lymphoma, that begins in the immune system.  Cancer has been a topic on more than 20 Second Opinion episodes, and Second Opinion doctors have also discussed the future of cancer and cancer treatment, as medical research and technology advances against certain types of this disease.