What is your treatment approach for p16+ oropharyngeal carcinoma with one positive node on neck dissection?

The question is quite broad and covers varying scenarios. My sense though is the question is asking about if/when would I recommend adjuvant radiation if an unirradiated patient has a neck dissection and 1 node is found. I will address the scenarios where the primary is either absent (ie unknown or T0), or has been managed adequately by surgery and there are no adverse features that would warrant adjuvant therapy due to a predicted low risk of recurrence, so the question is should we be worried ...