Anyone stopped Keytruda due to side effects?

My oncologist sited a UK study that shows a difference in mortality rate of patients who took Keytruda and those who did not was between 5% and 6%.
I have not searched for that study. I’d like to know if this was a valid study, strictly monitored.
I ask this because in my case I had a severe adverse reaction to my first dose of Keytruda and am considering suspending further infusions.
My oncologist said all immunology drugs would have similar side effects.
This cancer experience of mine is overshadowed by arthritis.
I’ve posted here before with more details.
Just wondering if further infusions are worth the side effects with only a 5-6% difference?
Has anyone else on here made a decision to stop infusions and what was the outcome/experience?