Wouldn't it only be cancer if your immune system doesn't destroy it? If your immune system can handle it, that's just normal.
The DNA damage that the parent was talking about would lead to cancerous cells which your immune system cannot handle, which is different from the ones that your immune system can handle
The DNA damage that the parent was talking about would lead to cancerous cells which your immune system cannot handle, which is different from the ones that your immune system can handle