SMUG1 and neoplasm: For all primary tumor lesions, SUVmean was lower for [68Ga]Ga-Pentixafor compared with [18F]FDG PET/CT, with an average SUVmean of 3.2 ± 1.6 for [68Ga]Ga-Pentixafor PET compared with 9.0 ± 4.1 for FDG.