Fine-tuning of the automated [18F]PSMA-1007 radiosynthesis

Radiolabeled prostate-specific membrane antigen (PSMA) targeting PET-tracers have become desirable radiopharmaceuticals for the imaging of prostate cancer (PC). Recently, the PET radiotracer [F-18]PSMA-1007 was introduced as an alternative to [Ga-68]Ga-PSMA-11, for staging and diagnosing biochemically recurrent PC. We incorporated a one-step procedure for [F-18]PSMA-1007 radiosynthesis, using both Synthra RNplus and GE TRACERlab FxFN automated modules, in accordance with the recently described radiolabeling procedure. Although the adapted [F-18]PSMA-1007 synthesis resulted in repeatable radiochemical yields (55 +/- 5%, NDC), suboptimal radiochemical purities of 87 +/- 8% were obtained using both modules. As described here, modifications made to the radiolabeling and the solid-phase extraction purification steps reduced synthesis time to 32 minutes and improved radiochemical purity to 96.10%, using both modules, without shearing the radiochemical yield.