your first treatment if you have advanced nonsquamous, non-small cell lung cancer and you do not have an abnormal "egfr" or "alk" gene. keytruda helps your immune system fight cancer, but can also cause your immune system to attack healthy parts of your body. this can happen during or after treatment and may be severe and lead to death. see your doctor right away if you have new or worse cough, chest pain, shortness of breath, diarrhea, severe stomach pain or tenderness, nausea or vomiting, rapid heartbeat, increased hunger or thirst, constipation, dizziness or fainting, changes in urine or eyesight, muscle pain or weakness, joint pain, confusion or memory problems, fever, rash, itching, or flushing. these are not all the possible side effects. tell your doctor about all your medical conditions, including immune system problems, if you've had an organ transplant, had or plan to have a stem cell transplant, or have lung, breathing, or liver problems. (katy vo) where i am now compared to a year ago, it's a story worth sharing. (avo) living longer is possible. it's tru. keytruda, from merck. with more fda-approved uses for advanced lung cancer than any other immunotherapy.