68Ga-NI-FAPI PET/CT: First-in-human Study

68Ga-NI-FAPI PET/CT: First-in-human Study in Patients With Various Cancers

68Ga-NI-FAPI is a novel radiotracer incorporating a hypoxia sensitive nitroimidazole (NI)-moiety and a FAP-targeting. In this study, we observed the safety, biodistribution, radiation dosimetry and diagnostic value of 68Ga-NI-FAPI PET/CT in patients with different types of cancer.

Carcinoma-associated fibroblasts (CAFs) are an integral part of the tumor microenvironment, and fibroblast activation protein (FAP), as a specific marker of CAFs, is overexpressed in more than 90% of epithelial malignant tumors' CAFs, with limited expression in normal tissues, making it an appropriate target for various tumors. Currently, several tracers targeting FAP for diagnostic purposes have been developed, such as 68Ga-FAPI-04, 68Ga-FAPI-02, and showed high efficacy in tumor staging and restaging. 68Ga-NI-FAPI is a novel agent incorporating a hypoxia sensitive nitroimidazole (NI)-moiety and a FAP-targeting. This pilot study was prospectively designed to evaluate the safety, biodistribution, radiation dosimetry and diagnostic value of 68Ga-NI-FAPI in patients with different types of cancer.

Inclusion Criteria:

• Various solid tumors with available histopathological findings
• Signed informed consent

Exclusion Criteria:

• pregnant or lactational women
• who suffered from severe hepatic and renal insufficiency