They can put in a peg at anytime - the drs where he is are wrong. I had mine put in at week 2 of rads. It's a simple procedure that in no way is effected by what he's going through he will feel uncomfortable but he's already uncomfortable - he is mildly sedated they go in and put it in place via ultrasound. It takes no more than ten - 15 minutes some people have had it done even further into treatment. Or he can have a nasal gastric tube put in. He needs his nutrition and hydration to heal and fight this otherwise it's a very steep slippery slope he'll find himself on. However is his caregiver there has to fight for him. I had a friend who reacted the same to cisplatin. He was sick as a dog for 7 weeks. Lived with his head in a garbage pail. He sucked it up and insisted they give it to him. They threatened to stop the last one but he managed to keep enough food down that he didn't lose anymore weight (he lost 50 lbs total) not fun but it's in is best interest to push until he gets what he wants. What country is he in? Hugs