177Lu-OncoFAP and 177Lu-FAP-2286 were included in the biodistribution study as controls. OncoFAP-23 presents enhanced tumor uptake and tumor retention and low accumulation in healthy organs, findings that correspond to a strongly improved in vivo antitumor efficacy. The data presented in this work support the clinical development of 177Lu-OncoFAP-23 for the treatment of FAP-positive solid tumors.
FAP-targeted radiopharmaceutical enhances PD-1-antibody-mediated TGI by increasing recruitment of tumor-infiltrating CD8+ T cells, which is enhanced and maintained in the presence of anti-PD-1. These findings provide a rationale for clinical studies of combined 177Lu-FAP-2286 radiotherapy and immune checkpoint blockade in FAP-positive tumors.
Lu-FAP-2286 PTRT, applied in a broad spectrum of cancers, was relatively well-tolerated with acceptable side effects and demonstrated long retention of the radiopeptide. Prospective clinical studies are warranted.