Multiple gastric cancer tissue proteomic identification predicts CLU as a biomarker for anti-PD-1 immunotherapy

• Clusterin (CLU) is a new negative predictive biomarker for anti-PD-1 immunotherapy of gastric cancer (GC). • CLU is a pivotal regulator of both tumor-intrinsic proliferation and immune evasion in GC. • CLU abrogation in GC enhances the immune response, boosting T-cell killing ability activity and cytokine secretion.