Integrin β4 drives immune evasion and therapeutic resistance to PD-1 blockade in bladder cancer via MEK/ERK signaling - Pingxia Lin; Zhuo Xing; Yulong Hong; Haozhe Xu; Shuai Shao; Liping Luo; Yuanqiao Zhao; Xin Jin; Yuan Li (Journal of Biological Chemistry, 2026)