How does Keytruda work with inactive colitis?

I have stage three non-small Cell lung cancer. They found it in March. It is now August. They wanted to set me up with chemo radiation and immunotherapy. I had chemo, which was carboplatinum and premixed had a severe reaction only 1 to 5% people get the kind I had and can no longer take it. Has anybody tried keytruda who has inactive colitis and how did that work? They’ve given me 6 to 12 months and it’s already been five. Would love to hear from anybody thanks. My name is Susan.