T-cell immunoglobulin and ITIM domain (TIGIT) is identified as a novel checkpoint receptor that can facilitate immune escape via mediating T-cell exhaustion in tumors. However, the clinical significance and immune contexture correlation of intratumoral TIGIT+ CD8+ T-cells remain to be further explored in muscle-invasive bladder cancer (MIBC).
259 patients with MIBC from two clinical centers (Zhongshan Hospital, n=141; Shanghai Cancer Center, n=118) were analyzed to evaluate the prognostic value and immune contexture association of TIGIT+ CD8+ T-cells through immunohistochemistry. Fresh tumor tissue samples from 26 patients with MIBC were examined to discover the phenotype of this CD8 subpopulation by flow cytometry.
High infiltration of intratumoral TIGIT+ CD8+ T-cells predicted poor overall survival (OS) and recurrence-free survival (RFS) in MIBC. For patients with stage II MIBC with low infiltration of TIGIT+ CD8+ cells, adjuvant chemotherapy (ACT) could significantly prolong their OS and RFS. Intratumoral TIGIT+ CD8+ T-cell abundance was correlated with impaired CD8+ T-cell cytotoxicity and exhibited production of immunosuppressive cytokine IL-10. Further analysis of tumor-infiltrating immune cell landscape revealed TIGIT+ CD8+ T-cells were associated with suppressive immune contexture, including Th2 cells, regulatory T-cells, mast cells and neutrophils.
Intratumoral TIGIT+ CD8+ T-cell abundance could serve as an independent prognosticator for clinical outcome and a predictive biomarker for inferior ACT responsiveness. Intratumoral TIGIT+ CD8+ T-cell abundance correlated with dampened CD8+ T-cell antitumor immunity and immunosuppressive contexture abundance, highlighting a tumor-promoting role of TIGIT+ CD8+ T-cells.
Journal for immunotherapy of cancer. 2020 Aug [Epub]
Zhaopei Liu, Quan Zhou, Zewei Wang, Hongyu Zhang, Han Zeng, Qiuren Huang, Yifan Chen, Wenbin Jiang, Zhiyuan Lin, Yang Qu, Ying Xiong, Qi Bai, Yu Xia, Yiwei Wang, Li Liu, Yu Zhu, Le Xu, Bo Dai, Jianming Guo, Jiajun Wang, Yuan Chang, Weijuan Zhang
Departments of Biochemistry and Molecular Biology, Fudan University School of Basic Medical Sciences, Shanghai, China., Department of Urology, Zhongshan Hospital Fudan University, Shanghai, China., Department of Immunology, Fudan University School of Basic Medical Sciences, Shanghai, China., Department of Urology, Shanghai Ninth People's Hospital, Shanghai, China., Department of Urology, Fudan University Shanghai Cancer Center, Shanghai, China., Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China., Department of Urology, Zhongshan Hospital Fudan University, Shanghai, China ., Department of Urology, Fudan University Shanghai Cancer Center, Shanghai, China ., Department of Immunology, Fudan University School of Basic Medical Sciences, Shanghai, China .