High mobility group box-1 (HMGBI)is a kind of non-histone chromatin-binding protein in nucleus.HMGB1 is intimately associated with the regulation of transcription,inflammation and rheumatic disease through binding the receptor.Recently,HMGB1 is overexpressed in several malignant tumors,and the expression level is positively correlated with the degree of differentiation,tumor invasion and metastasis.HMGB1 may be a new target molecule of antitumor.