What makes Cancerous cells stop growing?

Cancers continue to grow unless one of four things occurs;

1. The cancerous mass is removed by a surgeon.

2. Chemotherapy or another type of cancer - specific medication, such as hormonal therapy, is given to the person with cancer.

3. A person with cancer receives radiation therapy

4. The cancer cells shrink and disappear on their own.

This last event, while extremely rare, can occur with some melanomas( a type of skin cancer) or some kidney cancers.