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Published on: June 12, 2021
Prognostic Relevance of Immunosuppressive CD155/TIGIT Signaling in Locally Advanced Rectal Cancer Patients With
Yuan-Yao Tsai1,2, Tao-Wei Ke2,3, Chi-Hsien Huang1,4
1Graduate Institute of Biomedical Science, China Medical University, Taichung, Taiwan, R.O.C.
Background/Aim:
The CD155/TIGIT axis has recently emerged as a promising immunotherapeutic target in several malignancies. However, its prognostic relevance within the tumor microenvironment (TME) in patients with locally advanced rectal cancer (LARC) who have received neo-adjuvant chemoradiotherapy (neoCRT) remains unclarified.
Materials And Methods:
The levels of tumor CD155 and TIGIT+ T cells in pair-matched pre-neoCRT biopsies and post-neoCRT surgical tissues were evaluated in 110 LARC tissues using immunohistochemistry. The relationship between CD155, TIGIT+ T cells, and other clinicopathological parameters was analyzed.
Results:
The level of tumor CD155 was significantly increased in the post-neoCRT surgical tissues, compared to pre-neoCRT biopsies (p=0.0491). Moreover, tumor CD155 expression correlated with increased risk of local recurrence (p=0.016) and the infiltration of CD3+ T cells in the post-neoCRT surgical tissues (p=0.026). Patients with high tumor CD155 were significantly associated with worsen 10-year disease-free survival (DFS), suggesting the prognostic value of tumor CD155 on DFS in LARC patients who received neoCRT treatment. However, no significant association was observed between TIGIT+ T cells and DFS in these patients.
Conclusion:
Tumor CD155 may play a pivotal role in the response to neoCRT treatment through alternative immunological mechanisms and could become a novel immunotherapeutic target for LARC patients.
