There are several posters here who had clear margins, no follow up rad/chemo and had cancer appear someplace else later. I had SCC of tongue, about 1/6 of tongue removed, along with neck dissection that removed sevral cancerous noddes, all with clean margins. Followed up with rad/chemo to the affected side only.

What happens, 4 months later they find mets to the opposite side lymph nodes, so back for a second neck dissection and second round of rad/chemo on the opposite side of the first.

Really suggest a second opinon on this radiaton not needed issue. Even my docs were in conflict the first time around, surgeon says margins are all clear, no need for follow up treatment, oncologist says do the rad and Chemo. Only mistake was they should have done both sides the first time.
Bob