Automatic preparation of 18F-Alfatide Ⅱ and its PET/CT imaging in prostate cancer / 中华核医学与分子影像杂志

ABSTRACT

Objective:To prepare 18F-Alfatide Ⅱ automatically based on the improved CFN-100 fluorine multifunctional module and assess its PET/CT imaging in prostate cancer patients. Methods:A certain volume (200-500 μl) of fluoride ion was separated into the reaction tube by a fluoride ion separator and reacted with the labeled precursor l, 4, 7-triazacylononane-1, 4, 7-triacetic acid-E[(polyethylene glycol) 4-cyclo(Arg-Gly-Asp- D-Phe-Tyr)] 2(NOTA-E[PEG 4-c(RGDfk)] 2) (lyophilized kit). In the aqueous phase, 18F was chelated with aluminum. After being separated and purified by C18 column, 18F-Alfatide Ⅱ was prepared automatically. The radiochemical yield and its quality were analyzed. Quality control was carried out and 18F-Alfatide Ⅱ PET/CT imaging was performed in 2 patients (72 and 66 years old)with prostate cancer. Results:18F-Alfatide Ⅱ was prepared automatically by the improved CFN-100 fluorine multifunctional module combined with a double channel-fluorine ion separation device. 18F-Alfatide Ⅱ was synthetized in about 30 min, with radiochemical yield of (28±3)% (non-decay corrected, n=6). The radiochemical purity of the product was more than 98%, the specific activity was 2.8×10 7 MBq/mmol and the nuclear purity was >99%. PET/CT imaging of 2 patients showed that 18F-Alfatide Ⅱ were highly concentrated in prostate cancer lesions with the maximum standardized uptake value (SUV max) of 35.6 and 5.0, respectively. Conclusion:18F-Alfatide Ⅱ can be prepared successfully by improved CFN-100 fluorine multifunctional module with stable synthesis method, short synthesis time and high radiochemical yield, which can be highly concentrated in prostate cancer.