Epstein-Barr virus(EBV)has a high prevalence of infection worldwide,with early onset of a-symptomatic latent infection,and has been shown to be closely associated with the development of many lym-phomas and lymphoproliferative disorders.These diseases are characterized by both viral infection and involve-ment of the blood and lymphatic system,with complex clinical manifestations and poor prognosis,which pose problems in the diagnosis and selection of treatment options.Early detection and intervention are essential for the prevention and treatment of EBV-related diseases.However,traditional detection methods face the diffi-culties of viral leakage and the complex genetic features of EBV-associated lymphomas,and there is an urgent need for new detection techniques to assist in the diagnosis of the disease.This article mainly focuses on the clinical features of common EBV-associated lymphomas and the research progress of the corresponding detec-tion technologies.

Objective To assess the role of Matrix Metalloproteinase-9 (MMP-9)in rheumatoid arthritis (RA).Methods Peripheral blood from 45 RA patients and 28 healthy individuals (HV)were collected to detect RF and hs-CRP by immuno-turbidimetry,ESR by westergren method and MMP-9 by ELISA.The correlation was analysed between MMP-9 and RF, ESR or hs-CRP,respectively,by pearson correlation analysis.Results Levels of RF,ESR,hs-CRP and MMP-9 were signifi-cantly higher in RA patients than HV group (t=3.93~5.96,P<0.001),respectively.RF high titer patients or patients with a high inflammation response showed a higher MMP-9 levels than the RF low titer or slight inflammation patients (P<0.05).MMP-9 was positively correlated to RF,ESR and hs-CRP in RA patients(P<0.05),respectively.Conclusion MMP-9 maybe a sensitive tool in the diagnosis and management of RA patients.