Synthesis and evaluation of 68Ga-labeled imidazothiadiazole sulfonamide derivatives for PET imaging of carbonic anhydrase-IX

Carbonic anhydrase-IX (CA-IX) is markedly overexpressed in many types of solid tumors promoting tumorigenicity and tumor growth. We synthesized novel 68Ga-labeled imidazothiadiazole sulfonamide (IS) derivatives ([68Ga]Ga-DO3A-IS1 and [68Ga]Ga-DO2A-IS2), and evaluated their utility as positron emission tomography (PET) probes targeting CA-IX.[67/68Ga]Ga-DO3A-IS1 and [67/68Ga]Ga-DO2A-IS2 were synthesized from corresponding precursors by ligand...