Bob, I only know that a dear friend had thyroid cancer 20, yes 20!, years ago. She was in the hospital for a couple of days with a radioactive implant which killed everything, including the thyroid, and has taken the synthroid or something like it ever since, with no problems. Procedures have surely advanced in the interim, so you might do a search on the net. Just wanted you to know about my friend who is healthy and happpy post thyroid cancer. I don't think this is anything to panic over (grin).