I know there’s a reason, but I don’t know what it is.
In: Biology
Something missing from the picture is that we all have cancer cells in our body. They sometimes get created and are immediately killed, or they hang out somewhere without multiplying, or they make a tiny tumor somewhere not noticable. So all of this is not worth to be called “you have cancer”. One someone suffers from a noticable cancer that needs surgery, then the doctor can assume with higher probability that the same type of cells, or the same weakness that caused them, will do the trick again in the future. So this patient has to stay under observation even after a cancer is surgically removed.
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