Welcome to the forum. I’m so sorry that you have to join our group of friends and to hear that you’re worried about your brother’s treatment.

It’s not clear from your post how much radiation your brother got — was It just two sessions, or two courses of treatment. If it is the latter, then I do wonder what the dosage of radiation was (expressed as a gray — my husband, for example, received 70 grays initially, then 25 grays two more times in his lungs when the cancer had metastasized). My understanding is that after radiation, many patients have difficulty with healing. You hear about people getting surgery first, then radiation after; I have not myself heard of the two treatments being done the other way round.

Have you spoken to your brother about his own personal preference? What does he want to see in terms of his own treatments? Is your brother being treated at a comprehensive cancer center where the team approach is used and he will have access to a network of specialists? At this point, I would suggest getting a second opinion or even a third opinion, if you can. There may be other forms of treatment that the doctors may have to offer, for example clinical trials. Keytruda, as far as I know, is more palliative than curative in nature. This is important to know.