摘要
Objective: To elucidate the role and prognostic significance of lymphocyte activation-gene-3(LAG-3) in soft tissue sarcoma(STS).Methods: The expression of LAG-3 in patient and matched normal blood samples was analyzed by flow cytometry. The localization and prognostic values of LAG-3~+ cells in 163 STS patients were analyzed by immunohistochemistry. In addition, the expression of tumor-infiltrating CD3~+ T, CD4~+ T, and CD8~+ T cells and their role in the prognosis of STS were evaluated by immunohistochemistry. The effect of LAG-3 blockade was evaluated in an immunocompetent MCA205 fibrosarcoma mouse model.Results: Peripheral CD8~+ and CD4~+ T cells from STS patients expressed higher levels of LAG-3 than those from healthy donors.LAG-3 expression in STS was significantly associated with a poor clinical outcome(P = 0.038) and was correlated with high pathological grade(P < 0.001), advanced tumor stage(P = 0.016). Additionally, LAG-3 expression was highly correlated with CD8~+ T-cell infiltration(r = 0.7034, P < 0.001). LAG-3 was expressed in murine tumor-infiltrating lymphocytes, and its blockade decreased tumor growth and enhanced secretion of interferon-gamma by CD8~+ and CD4~+ T cells.Conclusions: LAG-3 blockade may be a promising strategy to improve the effects of targeted therapy in STS.
Objective: To elucidate the role and prognostic significance of lymphocyte activation-gene-3(LAG-3) in soft tissue sarcoma(STS).Methods: The expression of LAG-3 in patient and matched normal blood samples was analyzed by flow cytometry. The localization and prognostic values of LAG-3~+ cells in 163 STS patients were analyzed by immunohistochemistry. In addition, the expression of tumor-infiltrating CD3~+ T, CD4~+ T, and CD8~+ T cells and their role in the prognosis of STS were evaluated by immunohistochemistry. The effect of LAG-3 blockade was evaluated in an immunocompetent MCA205 fibrosarcoma mouse model.Results: Peripheral CD8~+ and CD4~+ T cells from STS patients expressed higher levels of LAG-3 than those from healthy donors.LAG-3 expression in STS was significantly associated with a poor clinical outcome(P = 0.038) and was correlated with high pathological grade(P < 0.001), advanced tumor stage(P = 0.016). Additionally, LAG-3 expression was highly correlated with CD8~+ T-cell infiltration(r = 0.7034, P < 0.001). LAG-3 was expressed in murine tumor-infiltrating lymphocytes, and its blockade decreased tumor growth and enhanced secretion of interferon-gamma by CD8~+ and CD4~+ T cells.Conclusions: LAG-3 blockade may be a promising strategy to improve the effects of targeted therapy in STS.
引文
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