Used in research and development for targeted cancer therapies, particularly in identifying and binding to fibroblast activation protein (FAP) expressed in the stroma of various tumors. Enables imaging of tumor microenvironments and supports the delivery of therapeutic agents specifically to cancer-associated fibroblasts. Investigated for use in immunoconjugates and radiolabeled antibodies to enhance tumor-specific treatment while minimizing damage to healthy tissues. Also serves as a reference standard in antibody drug development and assay calibration.