CD70-targeted immunoPET Imaging of Kidney Cancer

This study tests a new type of PET scan (a full-body imaging scan) that uses a specially designed tracer targeting a protein called CD70, which is found on kidney cancer cells. The goal is to improve how kidney cancer is detected and staged. **You may be eligible if...** - You are between 18 and 80 years old - You have been diagnosed with kidney cancer (especially clear cell or papillary types) confirmed by biopsy, or you have a suspicious mass on imaging that may be kidney cancer - You are able to give informed consent **You may NOT be eligible if...** - You are pregnant - You have severe liver or kidney disease - You have had major surgery in the past month - You have a known allergy to antibody-based radiopharmaceuticals (the imaging agent used in PET scans) Talk to your doctor to see if this trial is right for you.