Hi @ta52! I like the others on this post have been diagnosed with stage IV lung cancer. It metastasized to my brain, lymph nodes, liver and bones. After having a molecular profile done we found that my PDL 1 levels were at 90% which made me a good candidate for Keytruda. I have been on it since January 2019. My oncologist said as long as it is working we our going to keep going down that path. All of my scans have been coming back good. I hope it keeps working so I don't have to start chemo. I pray daily that God heals my body and everyone else's that has cancer. Wishing you the very best.