862 TLR9 agonism promotes cytotoxic T cell persistence and myeloid remodeling when combined with radiation therapy and PD-1 blockade in oligometastatic prostate cancer patients by Li Zhang, Lawrence Fong, David Y Oh, Eliezer Van Allen, Felix Y Feng, Anthony Wong, Eric J Small, Terence W Friedlander, Alec Starzinski, Zenghua Fan, Tony Li, Hewitt Chang, Marissa Gin, Katsuto Shinohara, Hao Nguyen, Caleb Hwang, Christopher De Leon, Rahul R Aggarwal