FAP and cancer: It has already been reported that compounds with high selectivity for FAP, such as FAPI-02, FAPI-04, and FAPI-46, are useful for diagnosis using labeled positron emitters (64Cu or 68 Ga) and treatment with labeled alpha or beta emitters (64Cu, 225Ac, 90Y, or 153Sm) for cancer, namely theranostics (Giesel et al. 2019; Kratochwil et al. 2019; Watabe et al. 2020; Kratochwil et al. 2021).