Application of 18F-PSMA PET / CT Imaging in Prostate Specific Membrane Antigen Positive Tumor

This study is testing the use of a special imaging scan called 18F-PSMA PET/CT — a scan that can detect tumors which express a protein called PSMA — in patients with various types of cancer. The goal is to see whether this imaging technique can better locate and diagnose PSMA-positive tumors across multiple cancer types. **You may be eligible if...** - You are 18 or older, any gender - You have a suspected or confirmed PSMA-expressing cancer (including prostate cancer, bladder cancer, colon cancer, liver cancer, multiple myeloma, and others) - You are willing and able to cooperate with imaging procedures - You have signed the informed consent **You may NOT be eligible if...** - You have serious neurological, gastrointestinal, heart, liver, or kidney conditions - You are pregnant or breastfeeding - You are allergic to the imaging agent or its components Talk to your doctor to see if this trial is right for you.