When the cell notices that a mutation has happened in the division processes, it "shuts down" the cell in order to survive and not procreate these cells with the mutation in them.
Answer: Cancer is unchecked cell growth. Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor.
