You are clearly not being treated in a comprehensive cancer center. You need to get some second opinions NOW. If there is disease in the lymph system, someone should be doing some PET scans of the body to see that this is still local/regional and hasn't gone farther. If their intent was to do a single sentinel node biopsy, and they found cancer in it, he should be on the schedule for a more extensive neck dissection immediatley to remove the nodes further down the chain. While your posting leaves many facts out, from what you have put up, I wouldn't have much confidence in your current team. (Actually it sounds like you do not have a "team" at all, as they would have come at this from different and compimentary angles.) I too would be asking questions and getting an additional opinion from a multidiciplinary team that includes a radiation oncologist and a chemo person. You don't mention what type of doctor got you this far into things with so much undone or unanswered. You only have one shot at this when it is in the lymph system. You need to be on this immediately.