I was diagnosed stage 3 merkle cell found in my lymph nodes . No skin cancer at all . I did Keytruda for a few months . It killed my thyroid. Both knees swelled so bad they had to be drained and got short of breath . Then I got off Keytruda . I then developed pancreatitis which was horrible pain . I was on Steroids for months . Thyroid pill for life . Diabetes meds as well . I did radiation also. Months out now and pet scan is clear . I get pet scan every three months so fingers crossed this mess is all behind me . Keytruda worked but it was rough. I only took 2 double dose and 1 single dose . It sneaked up on me with side effects. Side effects continued for 6 months off Keytruda . Best of luck