661 Dipeptidyl peptidase-9 (DPP9) overexpression is a potential response-predictive biomarker of BXCL701 and pembrolizumab combination treatment in mCRPC patients with SCNC phenotype - Vincent O’Neill; Veena Agarwal; Moses K Donkor; Sherry Kupchick; Rashmi Deshpande; Dawn Newmin (Journal for ImmunoTherapy of Cancer, 2023)