Hi Tomm1951,
It has been 14 years since my husband was diagnosed with Stage 4 lung cancer. However, he received Keytruda treatments and almost died. He got Pancreatitis which is a known side effect of Keytruda. It was because of our very good primary doctor and prayers, that he got to the right specialist and after a long battle, my husband was fine. However, he said that he would never have another Keytruda treatment. The cancer doctors didn't like that decision but it was my husband's body and money! (Keytruda cost $25,000 per infusion!) He received two infusions per month. My husband did great after that for quite a while. He did die of lung cancer two months ago. I really believe that if my husband had continued getting Keytruda he would have died sooner.

I would suggest doing as much research on Keytruda as you can before you make a decision. Don't just take what happened to my husband as the only result. Everyone is different when it comes to medication. Once you have a lot of information, then you can decide what is best for you. Pray about it and God will direct you.
I'll remember you in my prayers.
PML