Evaluation of a [67Ga]-Thiosemicarbazone Complex as Tumor Imaging Agent

[67Ga]labeled 2-acetylpyridine 4,4-dimethylthiosemicarbazone ([67Ga]- [APTSM2]2+) was prepared using freshly prepared [67Ga]GaCl3 and 2-acetylpyridine 4,4-dimethylthiosemicarbazone (APTSM2) for 30 min at 90°C (radiochemical purity: >97% ITLC, >98% HPLC, specific activity: 15–20 Ci/mmol). Stability of the complex was checked in human serum for 37°C. The biodistribution of the labeled compound in vital organs of normal and fibrosarcoma bearing mice were compared with that of free Ga3+ cation up to 24h. Initial SPECT images and biodistribution results showed significant tumor uptake in fibrosarcoma-bearing mice after 2 hour post injection

Synthesis and Preclinical Studies of [61Cu]-N-(2-hydroxyacetophenone)glycinate as a Possible PET Radiopharmaceutical

[61Cu]-N-(2-hydroxyacetophenone)glycinate ([61Cu]NHAG) was prepared using in house-made NHAG ligand and [61Cu]CuCl2 produced via the natZn(p,x)61Cu (180μA proton irradiation, 22MeV, 3.2h) and purified by a ion chromatography method. [61Cu]NHAG radiochemical purity was >98% and >99.9% by RTLC and HPLC methods respectively after purification by SPE. [61Cu]NHAG was administered into normal and tumor bearing mice followed by biodistribution studies up to 180 minutes. The best tumor accumulation was observed by animal sacrification after 120 min (tumor/muscle and tumor/blood ratios were 25.6 and 3.4 respectively). [61Cu]NHAG is a potential PET radiotracer for tumor imaging