Final answer:
Cancer develops when a tumor suppressor gene is inactivated. When these genes are inactivated or mutated, it can lead to uncontrolled cell division and the development of cancer.
Step-by-step explanation:
In order for cancer to develop, a tumor suppressor gene would need to be inactivated.
Tumor suppressor genes are responsible for regulating cell growth and preventing the formation of tumors.
When these genes are inactivated or mutated, it can lead to uncontrolled cell division and the development of cancer.