system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What happens when cancer "goes into remission"?

And why doesn't it get completely eliminated? What stops cancer from spreading when it goes into remission?
gpt
Remission means there are no more symptoms and, possibly, no more cancerous cells. Whether you beat your cancer through surgery, radiotherapy, chemotherapy, or some other method, remission means that the enough cancerous cells have been killed that doctors cannot find any trade of the disease.