Abstract 2207: The prognostic role of γδ T cells in colorectal cancer and the establishment of related nomogram for predicting overall survival of the patients

Abstract Objective: The aim of the present study was to explore the prognostic role of γδ T cells in colorectal cancer, and establish a nomogram for predicting the overall survival of the patients. Methods: Immunohistochemistry was performed to analyze the infiltration degree of γδ T cells in tumor and normal tissues of colorectal cancer. The relationship between γδ T cells infiltration in tumor tissues and the prognosis of patients with colorectal cancer were determined by survival analysis. Cox regression analysis was performed to detect the factors related to the prognosis of patients with colorectal cancer. R software was used to establish and verify a nomogram for predicting the prognosis of patients with colorectal cancer. Results: The degree of γδ T cell infiltration in tumor tissues and normal tissues of CRC was not different (t=0.35, P=0.731). However, the infiltration of γδ T cell was related to the survival status of the patients (x2=4.88, P=0.027). Besides, the infiltrating degree of γδ T cells in tumor tissue was obviously related to the prognostic improvement of the patients with colorectal cancer (Log-rank P=0.016) and could reflect the benefit of adjuvant chemotherapy (Log-rank P=0.003). Cox regression analysis showed that tumor stage (HR:3.14, 95%CI:1.25-7.89, P=0.015), serum CEA level (HR:3.67, 95%CI:1.48-9.10, P=0.005) and γδ T cell infiltration (HR:0.38, 95%CI:0.14-0.99, P=0.049) were independent prognostic factors of overall survival in patients with colorectal cancer. A nomogram based on tumor stage, serum CEA level and γδ T cell infiltration was established and showed a good prediction ability for survival of patients with colorectal cancer. Conclusion: γδ T cell infiltration degree in tumor tissue was an important factor to improve the outcome of patients with colorectal cancer, and could predict the benefit of adjuvant chemotherapy. The nomogram had a good ability for predicting overall survival of the patients with colorectal cancer. Citation Format: Rulan Ma, Dangcheng Xue, Yong Zhang, Kun Zhu, Dawei Yuan, Tuanhe Sun, Caijing Mo, Xiaoyuan Deng, Fujun Qin, Kang Li. The prognostic role of γδ T cells in colorectal cancer and the establishment of related nomogram for predicting overall survival of the patients [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 2207.