I'm experiencing this situation now. I also have multiple lung nodules in both lungs after being in remission from Stage 3-B treatment in 2008 for ten years, beginning in 2018 when they begun becoming malignant. Besides the radiation I experienced for the primary cancer in 2008, I've had four different nodules radiated since 2018 and my radiologist and oncologist are telling me we're running out of treatments. The radiologists who read my CT's continue to report that I have multiple other nodules in both lungs that appear to be growing in size. I also don't have biomarkers, but my oncologist at UCSF is considering Keytruda, based on a current trial (IMPRINT) at M.D. Anderson. He has warned me, however, that his patients who have undergone lung radiation are at a higher risk for pneumonitis when on the immunotherapy drug. I'm curious if anyone who has had radiation for slow-growing lung nodules have had experience with Keytruda.