DPP4 and prostate cancer: IC50 of DPP4 < 4 nM; IC50 of FAP = 560 nM; IC50 of DPP8 = 4 nM; IC50 of DPP9 = 11 nM [36,37]; Phase II studies for prostate cancer and solid tumors; Phase I/II study for pancreatic cancer (https://adisinsight.springer.com/drugs/800016264, accessed on 5 November 2021).