68Ga-grazytracer PET Assists in Diagnosing Pseudoprogression Following Immunotherapy in Lung Cancer.

This study is testing a special type of imaging scan called a PET scan using a tracer called 68Ga-grazytracer to help doctors tell the difference between real cancer progression and "pseudoprogression" in lung cancer patients. Pseudoprogression is when tumors temporarily appear larger on scans after immunotherapy — not because the cancer is truly worsening, but because the immune system is attacking it. This distinction is crucial for treatment decisions. **You may be eligible if...** - You have lung cancer confirmed by biopsy - You have been treated with immune checkpoint inhibitor therapy - Your scans show that tumors may have grown or new spots have appeared, and doctors aren't sure if it's true progression or pseudoprogression - You are between 18 and 75 years old - You have a life expectancy of at least 6 months **You may NOT be eligible if...** - You have serious heart, lung, bone marrow, liver, or kidney problems - You have a bowel perforation or complete bowel blockage - You have active blood infections Talk to your doctor to see if this trial is right for you.