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Objective:To investigate the expressions of plasminogen activator inhibitor type 1(PAI-1),C-erbB-2,VEGF and Ki-67 by immunohistostaining and then to evaluate the prognostic value of PAJ-1 in node-negative breast cancer,Methods:The study included a retrospective series of 62 female patients with axillary lymph node-negative breast cencer.Expressions of PAI-1,C-erbB-2,VEGF and Ki-67 were determined by immunohistostaining on formalin-fixed paraffin-embedded tissue sections from these patients after a median follow-up of 69 months(range 22-117 months).Correlations with well known clinicopathologic factors were assessed and multivariate survival analyses were performed.Results:High PAI-1 level was positively associated with high histologic grade of the tumors.Disease-free survival(DFS)was significantly shorter for the patients with moderate to intensive expression of PAI-1 lban for those with negative(X2=25.46,P＜0.001:X2=23.07,P＜0.001)to mild expression(X2=19.75,P＜0.001:X2=17.40.P＜0.001).Although on univariate analysis of the prognostic factors,tumor size,location of primary tumor and age as well as expressions of PAI-1,VEGF and Ki-67 were all significantly prognostic factors for DFS(P＜0.05),PAI-1 was the only independent prognostic factor on multivariate analysis(P＜0.0001;hazard ratio[HR].4.041:95% confidence intewal[CI],1.928-8.468).Conclusion:These results of the current study indicate that intermediate or high expression of PAI-1 represents a strong and independent unfavorable prognostic factor for the development of recurrence or metastases in axillary node-negative breast cancer.