[Expression and Clinical Significance of Cytokines and Lymphocyte Subsets in Patients with Diffuse Large B-Cell Lymphoma].

Objective: To study the role of cytokines and lymphocyte subsets in the diagnosis, prognosis and efficacy evaluation of DLBCL patients, and the effects of Tislelizumab on immune function and cytokines in DLBCL patients.

Methods: Twenty-three patients with newly diagnosed DLBCL were selected as DLBCL group and 34 patients with megaloblastic anemia as the control group. The levels of peripheral blood cytokines IL-2, IL-4, IL-6, IL-10, TNF- α and IFN-γ by ELISA method. The levels of peripheral blood CD3, CD4, CD8 T lymphocytes, B lymphocytes and NK cells， the ratio of CD4/CD8 were detected by flow cytometry. The levels of cytokins and lymphocyto subsets in DLBCL patients with different clinical data and different therapeutic effects were compared.

Results: The levels of cytokines IL-2, IL-6 and IL-10 in DLBCL group were significantly higher than those in control group, but there was no significant correlation between cytokine levels and age and gender. The higher IPI score, higher Ann Arbor stage, B symptoms, higher β -MG, LDH and CRP levels, IL-6 and IL-10 levels were significantly higher, and IL-4 was also significantly higher in patients with high LDH levels. Compared with the ineffective group, the levels of IL-6 and IL-10 were significantly lower and the level of CD4 T cells and the ratio of CD4/CD8 was significantly higher in the effective group before therapy. The levels of IL-6, IL-10 and B lymphocytes in the effective group decreased significantly after therapy compared to those before therapy. After 4 cycles of therapy, the level of IL-2 and the ratio of CD4/CD8 in the Tislelizumab group were significantly higher than those in the non-Tislelizumab group, and the level of CD8 T cells was significantly lower than that in the non-Tislelizumab group(<0.05). The level of B lymphocytes in both the Tislelizumab group and the non-Tislelizumab group after therapy was significantly lower than that before therapy.

Conclusion: The expression of cytokines and lymphocyte subsets in peripheral blood of patients with DLBCL is abnormal, which is related to the severity, prognosis and therapeutic effect of the disease. Tislelizumab can improve the immune function of patients with DLBCL by affecting cytokines and lymphocyte subsets and strengthen anti-tumor immunity.