Experimental PET Imaging Scans Before Cancer Surgery to Study the Amount of PET Tracer Accumulated in Normal and Cancer Tissues

PRIMARY OBJECTIVE: I. To define the biodistribution of gallium Ga 68 FAPi-46 (68Ga-FAPi-46) and gallium Ga 68-labeled PSMA-11 (68Ga-PSMA-11) in normal and cancer tissues of patients with various non-prostate malignancies. The goal is to determine where and to which degree 68Ga-FAPi-46 and 68Ga-PSMA-11 accumulates in normal and cancer tissues. SECONDARY OBJECTIVES: I. To evaluate whether 68Ga-FAPi-46 and 68Ga-PSMA-11 accumulation observed by positron emission tomography (PET) correlates with the amount of fibroblast activation protein (FAP) and prostate specific membrane antigen (PSMA) in excised cancer tissue, respectively. II. To evaluate the 68Ga-FAPI-46 biodistribution correlation with 18F-FDG biodistribution (when available) to define the frequency of the following phenotypes (FAP+/ FDG+, FAP-/ FDG+, FAP+/ FDG-, FAP-/ FDG-). EXPERIMENTAL OBJECTIVE: III. Assess the 68Ga-FAPI-46 biodistribution correlation with 68Ga-PSMA-11, if the patient volunteers for optional scan, and 18F-fluodeoxyglucose (FDG), if any FDG PET/computed tomography (CT) has been performed as standard-of-care. OUTLINE: Patients receive 68Ga-FAPi-46 intravenously (IV) and undergo PET/CT scan over 20-50 minutes. On another day, patients receive 18F-FDG and then undergo PET/computed tomography (CT) according to standard of care procedures (if applicable). Patients may also receive 68Ga-PSMA-11 IV and undergo PET/CT scan over 20-50 minutes on a separate day (for volunteer patients only, PSMA PET/CT is optional and not required).