Abstract
Recent studies have indicated that Aurora B expression is related to cell proliferation and prognosis in many cancers, but its association with epithelial ovarian carcinoma is not fully understood. Therefore, we examined the Aurora B kinase expression in epithelial ovarian cancer patients. Using immunohistochemistry, the expression levels of Aurora B and phosphohistone H3 (Ser10) (mitosis-specific marker) were measured in 156 patients with epithelial ovarian cancer. The expression levels of Aurora B at the protein and messenger RNA levels were examined using Western blotting and reverse transcriptase polymerase chain reaction. In total, 53 tumorous ovarian samples (34.0%) showed Aurora B overexpression, which was significantly higher than that found in the 15 normal ovarian tissue samples (0%, p = 0.006). The overexpression of Aurora B was also significantly higher in cases showing phosphohistone H3 (Ser10) overexpression (44.3% vs. 27.4%, p = 0.03). In addition, the expression of Aurora B in poorly and moderately differentiated carcinomas of the ovary was significantly higher than in well-differentiated carcinomas (53.6% vs. 28.2% vs.10.0%, respectively, p = 0.02). The overexpression of Aurora B was significantly higher in cases with lymph node metastasis (p = 0.01) and a positive ascites cytology (p = 0.008). Overall, the Aurora B overexpression group demonstrated a significantly shorter progression-free survival (p = 0.001) and overall survival (p = 0.023) than the Aurora B low expression group using univariate analysis (log-rank statistic). Aurora B is an effective predictor of aggressive epithelial ovarian carcinoma in terms of differentiation, metastasis, and prognosis.
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Acknowledgments
We thank Ching-Fen Yang for her evaluation of the immunohistochemical score. We appreciate Professor Ralphy Kirby’s help in improving the style of written English. We thank Dr. Muh-Hwa Yang for his involvement in revising the manuscript. We are grateful for the assistance of Miss Tsui-Ying Huang in completing the RT-PCR and Western blots. This research was supported, in part, by grant 96-VGH-B1-010 from Veterans General Hospital and by a grant from the Ministry of Education “Aim for the Top University” Plan. This study was also supported by research grants from Yen-Tjing-Ling Medical Foundation (CI-97-6).
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Yi-Jen Chen carried out immunohistochemical staining, performed the statistical analysis, and drafted the manuscript. Chun-Ming Chen carried out the RT-PCR, Western blot and drafted the manuscript. Chiung-Ru Lai assessed the pathological specimens and evaluated the immunohistochemical score. Nae-Fang Twu, Ming-Shyen Yen, Hua-Hsi Wu, and Peng-Hui Wang participated in the design of the study and provided patients’ data. Chiou-Chung Yuan conceived of the study and participated in its design and coordination. All authors read and approved the final manuscript.
C.-M. Chen and C.-C. Yuan contributed equally to this work.
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Chen, YJ., Chen, CM., Twu, NF. et al. Overexpression of Aurora B is associated with poor prognosis in epithelial ovarian cancer patients. Virchows Arch 455, 431–440 (2009). https://doi.org/10.1007/s00428-009-0838-3
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DOI: https://doi.org/10.1007/s00428-009-0838-3