Research is exploring the clinical applications of fibroblast activation protein inhibitor positron emission tomography (FAPI-PET). The technology is being investigated for use in imaging various conditions, including tumors and autoimmune diseases, with potential applications in guiding radionuclide therapy. Studies are underway to assess the effectiveness of FAPI-PET in different types of cancer, such as ovarian and lung cancer, and compare it to existing imaging techniques.