Well it seems it's quite different in this part of the world.
We were told that patients who have a PEG placed prior to treatment starting do better in the long term. They lose less weight and consequently have a better outcome.
Kris had his PEG placed prior to rads and chemo, they would not start without it in situ. Despite this he was strongly encouraged to continue to swallow as much as he could. In fact we only used his PEG to supplement feeding on 2 days of his treatment.
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!