FAP and neoplasm: Directly comparing the performance of our bispecific tracers with those reported previously is difficult as different tumor models were used for evaluation: PSMA-expressing LNCaP tumors and FAP-expressing HEK293T:hFAP tumors used in this report; PSMA-expressing PC3-PIP tumors and FAP-expressing U87 tumors used by Boinapally et al. [32]; PSMA-expressing 22Rv1 tumors and FAP-expressing A549-FAP tumors used by Hu et al. [33].