892 ABL503 (TJ-L14B), PD-L1x4–1BB bispecific antibody induces superior anti-tumor activity by PD-L1-dependent 4–1BB activation with the increase of 4–1BB+CD8+ T cells in tumor micr... by Wenqing Jiang, Zhengyi Wang, Jaeho Jung, Hyunjoo Kim, Eunsil Sung, Jaehyoung Jeon, Youngkwang Kim, Shinai Lee, Yangmi Lim, Jonghwa Won, Uijung Jung, Hyung-Seung Jin, Gihoon You