I was just wondering if the cost to you was a factor in your decision. Because it wasn't for me. I paid the same amount (65$ copay) for an infusion whether or not it included Keytruda. But I did not like the thought that there was a large profit being made from giving me a useless treatment. (And I'm not sure to what extent my doctor/hospital have a conflict of interest here.)

I know I'm being negative about Keytruda for me, but if I were in your situation, I would stay on it as long as they'd let me, unless I was having side effects.