Oh Sandy, your initial post made me want to shout out No. As has already been explained that would have been a sure fire guarantee for a recurrence going forward. I'm so pleased that you did not really consider this as an option.
Kris had a clear PET 3 months post rads and Cisplation. But, there it was again just a few months later. He was HPV positive. Treatment must always be completed to maximise benefit.
I hope the next few weeks go well.
Tammy

Caregiver/advocate to Husband Kris age 59@ diagnosis
DX Dec '10 SCC BOT T4aN2bM0 HPV+ve.Cisplatin x3 35 IMRT.
PET 6/11 clear.
R) level 2-4 neck dissection 8/1/11 to remove residual node - necrotic with NED
Feb '12 Ca back.. 3/8/12 total glossectomy/laryngectomy/bilat neck dissection/partial pharyngectomy etc. clear margins. All nodes negative for disease. PEG in.
March 2017 - 5 years disease free. Woohoo!