Cancer causes cells to divide uncontrollably. This can result in tumors, damage to the immune system, and other impairment that can be fatal.
In the United States, an estimated 15.5 million people with a history of cancer were living as of January 1, 2016, according to a 2018 report from the American Cancer Society.
In this article, we examine types of cancer, how the disease develops, and the many treatments that help improve the quality of life and survival rates.