FAP and breast cancer: Huang et al.[18] introduced different inhibitors of prolyl peptidases including Val-boroPro (talabostat); Glu-boroPro (PT-630); or 1-[[(3-hydroxy-1-adamantyl)amino]acetyl]-2-cyano-(S)-pyrrolidine (LAF-237) to investigate the function of FAP-α on breast cancer cells in a SCID mice model.