Abstract
Background: Breast cancer remains a leading cause of cancer-related death in women. Numerous studies have demonstrated that mammaglobin is one of the most promising markers for diagnosis of breast cancer. However, little is known about the relationship between mammaglobin and overall survival. The small number of published studies has yielded controversial results. Objective: This study was performed to clarify the association between expression of mammaglobin in peripheral blood and prognosis in breast cancer patients. Methods: We systematically reviewed and meta-analyzed the data showing the association between expression of mammaglobin in peripheral blood and prognosis in breast cancer patients. The data were obtained from analysis of disease free survival (DFS)/event free survival (EFS) and overall survival (OS). Results: Our analysis showed that patients expressing mammaglobin in peripheral blood before the removal of the primary tumors or chemotherapy showed shorter DFS/EFS, but no change in OS. The detection of mammaglobin mRNA in peripheral blood was not associated with worse outcome for OS, but the effect size was not small. Conclusion: These data indicate that a meaningful association of mammaglobin might be found if large scale studies are performed. Large prospective studies are necessary to determine the prognostic value of the detection of mammaglobin mRNA in peripheral blood of breast cancer patients.
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