Cancer is caused by mutations, exposure to carcinogens, and out of control cellular reproduction a type of infection that is caused by viruses, mutations, and poor lifestyle choices a virus caused by infection, mutations, and exposure to carcinogens all of the above

Types of cancer are usually named for the organs or tissues where the cancers form. For example, lung cancer starts in cells of the lung, and brain cancer starts in cells of the brain. Cancers also may be described by the type of cell that formed them, such as an epithelial cell or a squamous cell.Feb 9, 2015