Automated radiosynthesis of [C]CPPC for in-human PET imaging applications.

The macrophage colony-stimulating factor 1 receptor (CSF1R) is almost exclusively expressed in microglia, representing a biomarker target for imaging of microglia availability. [C]CPPC has specific binding affinity to CSF1R and suitable kinetic properties for PET imaging of microglia. However, previous studies reported a low radiochemical yield, motivating additional research to optimize [C]CPPC radiochemistry. In this work, we report an automated radiosynthesis of [C]CPPC on a Synthra MeIPlus module with improved radiochemical yield. The final [C]CPPC product was obtained with excellent chemical/radiochemical purities and molecular activity, facilitating high-quality in-human PET imaging applications.