I have asked my doctors and my family`s doctors and the unanimous reply seems to be the same: noone knows for sure, and most likely, because of the fact that there are cancer cells in his body, there is a chance that the cancer he used to have will return (depending on what he does to prevent it`s return). Also, if his cancer was a metastatic type, a cell or microcopic tumor can lodge somewhere in the body and begin growing there. there is a difference between "lung cancer" and a "metastisist", actual lung cancer where part of the lung tissue becomes cancerous is much harder to beat than a cancer that attaches to a part of the lung or anywhere else and keeps growing itself making a clump or tumor, this metastising cancer is easily removed as long as it hasnt gone long undetected.
Also Most cancers will show an immune system response under the microscope so if his cancer wasn`t to severe he may never have trouble with it again.
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skin cancer and other cancers 
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