Would you offer adjuvant immunotherapy after salvage neck dissection for persistent nodal disease after definitive chemoRT for a patient with p16+ oropharyngeal SCC?

I am assuming that this HPV+ oropharyngeal cancer patient was treated with definitive CRT and then on a 3-month follow-up, PET had persistent nodal disease, which was definitively treated with a neck dissection. If the pathology revealed positive disease, then I would not offer the patient further t...