Well unfortunately there are no absolutes... the truth is if you get a definitive cancer dx.. that becomes even more murky... since with cancer there are even less absolutes. ;o) You're always walking around wondering if you will have a recurrence even if you pass certain milestones. 2yr, 3yr, 5yr...

Another truth is that you or I or anyone else can be afflicted with cancer or a heart attack or stroke etc... at any given time. I may be 5 years out from radiation and get mowed down by a bus. All any of us have is NOW. Not to say we shouldn't plan for the future but live your life now and don't put off until tomorrow what you should do today...

That said... Get a referral to an ENT. See him or her if that will ease your mind. That way if things change, or begin to get worse, or you just want it monitored by someone who KNOWS CANCER - then you are already where you should be. Then be happy you've done all you can and live your life. Just be diligent and check it monthly and see the ENT once say every few months.

best of luck... ;o)