AI-Guided Blood Proteomics for Treatment Optimization in Veterans with Metastatic Prostate Cancer.The Washington DC VA Medical Center (DC VAMC) is conducting a longitudinal study enrolling Veterans wi... AI-Guided Blood Proteomics for Treatment Optimization in Veterans with Metastatic Prostate Cancer.The Washington DC VA Medical Center (DC VAMC) is conducting a longitudinal study enrolling Veterans with metastatic hormone-sensitive prostate cancer (mHSPC) and metastatic castration-resistant prostate cancer (mCRPC). Serial peripheral blood specimens are collected at predefined timepoints before, during, and after treatment.