FAP and lung cancer: As tumor stroma could express murine FAP in desmoplastic human lung cancer xenografts (55), and our FAP-12 CAR-T cells could target both human and murine FAP, the combination of Nectin4-7.19 CAR-T cell therapy and FAP-12 CAR-T cell therapy for metastatic lung cancer in mice exerted a synergistic anti-tumor effect without any toxicities.