The immune checkpoint expression in the tumor immune microenvironment of DLBCL: Clinicopathologic features and prognosis

• DOI: 10.3389/fonc.2022.1069378
• Publication Date: 2022-12-06T05:56:23Z
• Authors: Jiajia Ma; Xuelian Pang; Junna Li; Wei Zhang; Wenli Cui
• Keywords: TIGIT; TIM-3; Neoplasms. Tumors. Oncology. Including cancer and carcinogens; 3. Good health; 03 medical and health sciences; 0302 clinical medicine; Oncology; LAG-3; DLBCL; PD-1; immune checkpoint; RC254-282

Background & aimsThe immune checkpoint recently provides a new strategy for the immunotherapy of malignant tumors. However, the role in the immune microenvironment of DLBCL is not completely clear.MethodsWe detected the expression of PD-1, LAG-3, TIM-3, and TIGIT on TILs and on tumor cells among 174 DLBCL patients by IHC.ResultsIn TILs, the positive rates of PD-1, LAG-3, TIM-3 and TIGIT were 79.3%, 78.8%, 62.7% and 69.5%, respectively.TIM-3 and TIGIT were expressed in 44.8% and 45.4% of tumor cells. The expression of TIM-3 in TILs was significantly correlated with the Ann-Arbor stage (P=0.039). There was a positive correlation Between PD-1 and LAG-3 or TIM-3 and TIGIT.In addition, LAG-3 expression in TILs was associated with inferior prognosis.Multivariate analysis showed that PS score and R-CHOP therapy were independent risk factors for OS and PFS in patients with DLBCL (P=0.000).ConclusionsThe expression level of TIM-3 is closely related to the Ann-Arbor stage, which may be expected to be a new index to evaluate the invasiveness of DLBCL. PD-1 was correlated with the expression of LAG-3, and the high expression of LAG-3 and LAG-3/PD-1 predicted the poor prognosis of DLBCL. Therefore, LAG-3 may become a new target of immunotherapy, or be used in combination with PD-1 inhibitors to improve the drug resistance of current patients with DLBCL.