What happens to cancer cells following treatment? Does it remain in a patient’s body?

Question: 

What happens to cancer cells following treatment? Does it remain in a patient’s body?

Answer: 

Radiation destroys tumor cells so they cannot regenerate, but it does not remove the affected cells from the body as surgery does. With effective treatment, the tumor may shrink or disappear entirely, or its growth may be stopped. Radiation therapy works by damaging the genetic material within the cancer cells and limiting their ability to successfully reproduce. When these damaged cancer cells die, the body naturally eliminates them.

Content Title: 
What happens to cancer cells following treatment? Does it remain in a patient’s body?