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TURKISH JOURNAL OF IMMUNOLOGY, vol.8, no.1, pp.6-12, 2020 (Journal Indexed in ESCI)
Introduction: Chronic lymphocytic leukemia (CLL) that arises by malignant transformation of mature B cell is the most common leukemia in elderly. CLL is characterized by accumulation of CD5(+)CD19(+) cells in the peripheral blood and lymphoid organs. While CD8(+) T lymphocytes response intracellular pathogen and tumor, CD4(+) T lymphocytes regulate immune response. T follicular (Tfol) cells stimulate affinity maturation and class-switch recombination in B lymphocytes due to cytokine and surface molecules. In this study, we aimed to investigate CD4(+)T, CD8(+)T and CD3(+)CD4(+)CXCR5(+) follicular T (Tfol) cells in the peripheral blood of the CLL patients compared to healthy controls.