Various radiometal complexes have been developed for
tumor imaging, especially Ga-68 tracer. In the present study, the development of a radiogallium bis-
thiosemicarbazone complex has been reported. [(67)Ga]
acetylacetonate bis(
thiosemicarbazone) complex ([(67)Ga] AATS) was prepared starting [(67)Ga]
Gallium acetate and freshly prepared
acetylacetonate bis (
thiosemicarbazone) (AATS) in 30 min at 90°C. The partition co-efficient and the stability of the tracer were determined in final
solution (25°C) and the presence of human serum (37°C) up to 24 h. The biodistribution of the labeled compound in wild-type and
fibrosarcoma-bearing rodents were determined up to 72 h. The radiolabled Ga complex was prepared in high radiochemical purity (> 97%, HPLC) followed by initial biodistribution data with the significant
tumor accumulation of the tracer in 2 h which is far higher than free Ga-67
cation while the compound wash-out is significantly faster. Above-mentioned pharmacokinetic properties suggest an interesting radiogallium complex while prepared by the PET Ga
radioisotope, (68)Ga, in accordance with the physical half life, for use in
fibrosarcoma tumors, and possibly other
malignancies.