Scans with microPET and clinical PET using [68 Ga]Ga-PSMA-1-DOTA at 1 h post-injection reflected only initial uptake, not retention, even though our mouse treatment study with [177Lu]Lu-PSMA-1-DOTA showed efficacy (with [177Lu]Lu-PSMA-617 treatment as a positive control), and thus indirectly verified sufficient tumor retention. This evidence concerns the gene FOLH1 and neoplasm.