If the doctor can explain why there is suddenly no cancer, then it is just an occurance of a very improbable event. If there is no evidence as in the cancer just disappears and nothing can be found which may indicate why, then theres something more to it.
If you mean God by something more to it, I disagree. Ignorance doesn't prove the existance of God.
Otherwise, yes what you said is true, there is something more, that we just don't yet understand.