FOLH1 and neoplasm: It would be difficult to directly compare the performance of our bispecific radiotracers with [68Ga]Ga-FAPI-PSMA as different tumor models were used for evaluation: PSMA-expressing LNCaP tumors and FAP-expressing HEK293T:hFAP tumors were used in our study, and PSMA-expressing 22Rv1 tumors and FAP-expressing U87 MG tumors were used by Wang et al. [27].