Tumor-infiltrating CD226+CD8+ T cells are associated with postoperative prognosis and adjuvant chemotherapeutic benefits in gastric cancer patients

• DOI: 10.1007/s00432-022-04346-x
• Publication Date: 2022-09-15T08:09:42Z
• Authors: Yu Zhang; Zhen-xiong Zhao; Jian-peng Gao; Ya-kai Huang; Hua Huang
• Keywords: China; 0303 health sciences; 03 medical and health sciences; Lymphocytes, Tumor-Infiltrating; Stomach Neoplasms; T-Lymphocyte Subsets; Tumor Microenvironment; Humans; CD8-Positive T-Lymphocytes; Prognosis

Defining the phenotypic characteristics of CD8+ T cell subsets in gastric cancer (GC) can help remodel the immune microenvironment of the tumor, thereby improving patient prognosis. CD226 has recently been shown to regulate the activity of CD8+ T cell in several malignancies. However, the clinical relevance of CD226+CD8+ T cells in GC remains unclear.Fudan University Shanghai Cancer Center (FUSCC) cohort (n = 316), The Cancer Genome Atlas (TCGA) cohort (n = 407), KUGH/KUCM cohort (n = 202), and Asian Cancer Research Group (ACRG) cohort (n = 300) were included in prognosis and response to adjuvant chemotherapy (ACT) analyses. Flow cytometry and multiplex immunostaining were used to characterize CD226+CD8+ T cells.CD226+CD8+ T cells predicted favorable outcomes in patients undergoing curative resection for GC. GC patients with high CD226+CD8+ T cell infiltration benefitted more from adjuvant chemotherapy. CD155 is upregulated in GC tissues and is associated with decreased intra-tumoral CD226+CD8+ T cell infiltration. The combination of intra-tumoral CD226+CD8+ T cells and CD155 is a strong prognostic predictor in patients with GC.CD226+CD8+ T cells may represent a novel therapeutic target and a useful marker of prognosis and therapeutic response in patients with GC.