Prospective Exploratory Study of FAPi PET/CT With Histopathology Validation in Patients With Various Cancers

Inclusion Criteria: * Patients with the following cancer types: * Brain cancer * Bladder cancer * Urothelial cancer * Testicular cancer * Skin cancer * Thyroid cancer * Hepatocellular carcinoma * Cholangiocarcinoma * Thymus cancer * Pleural cancer * Cervical cancer * Adrenal cancer * Neuroendocrine tumors * Hematologic cancer * Cancer of Unkown Primary * Patients who are scheduled to undergo surgical resection or tissue biopsy of the primary tumor and/or metastasis * Patients are ≥ 18 years old at the time of the radiotracer administration. * Patient can provide written informed consent * Patient is able to remain still for duration of imaging procedure (up to one hour) Exclusion Criteria: * Patient is pregnant or nursing * Patients with any new cancer therapy between the baseline PET/CT and the investigational FAPI PET/CT * Patient has underlying disease which, based on the judgment of the investigator, might interfere with the collection of high quality data