Talabostat (Val-boroPro, PT-100) is a dipeptidyl peptidase inhibitor with IC50 values of <4 nM, 4 nM, 11 nM, 310 nM, 560 nM and 390 nM for DPP-IV, DPP8, DPP9, QPP, FAP and PEP respectively. It has antineoplastic and hematopoiesis- stimulating activities.