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Understanding Cancer: Causes and Mechanisms Cancer is a term used for diseases in which abnormal cells divide without control and can invade other tissues. It's not just one disease but a collection of related diseases that can occur anywhere in the body. Human bodies are made up of trillions of cells organised into tissues and organs. Normally, human cells grow and multiply (through a process called cell division) to form new cells as the body needs them. When cells grow old or become damaged, they die, and new cells take their place. Sometimes this orderly process breaks down, and abnormal...