Welcome, and sorry you had to join. I'm not as familiar with oral tongue as I am with oropharyngeal, which is my type cancer. You probably know more than I do, being a physician, but I wonder if an endoscopy was done with biopsy to the oropharynx being your cancer was HPV pos, and since 90 percent of HNC HPV is in the oropharynx, mainly the tonsil, and base of tongue, but can occur in the oral tongue. An analysis was done a few years back, checking medical reports, scans, recurrences and many showed were originally misdiagnosed as oral cancer or cancer was missed when the oropharynx was the primary.

I don't see many sentinel node biopsies, but may be the next best thing to do for HNC. Good luck, and hope someone here has some other advise.