This prospective case-control study aims to evaluate the immune function and find PD-1 antibody efficacy predictors on Chronic Active Epstein-Barr Virus Infection and Epstein-Barr virus-associated hemophagocytic lymphohistiocytosis by detecting lymphocyte subsets proportions in peripheral blood mononuclear cells and the positive proportion of PD-1, PD-L1 and other indicators in each lymphocyte subsets in healthy people and patients using flow cytometry before and after the initial PD-1 therapy.
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EBV-DNA
Timeframe: Change from before and 2 weeks after initiating PD-1 blockade therapy.