Abstract
Although there are many reports on the clinical use of the MIB-1 labeling index (LI), which is a measure of proliferative activity in astrocytomas; its significance varies between studies. There are no known molecules that are directly linked to the MIB-1 LI in astrocytomas. We evaluated the clinical value of the MIB-1 LI in our human glioblastoma cases and determined the molecules that possibly influenced the MIB-1 LI. An immunohistochemical study of the MIB-1 protein was performed and MIB-1 LIs of 38 glioblastomas were determined. In the same cases, epidermal growth factor receptor (EGFR), platelet-derived growth factor receptor-α (PDGFRA), and sphingosine-1-phosphate receptor type 1 (S1P1), which are known regulators of glioma cell proliferation, were detected and quantified by quantitative real-time-PCR or western blotting. Kaplan–Meier survival curves for 38 patients with glioblastomas showed that a high MIB-1 LI correlated with poor survival (P < 0.05). Among the molecules tested, only the low expression of S1P1 was significantly correlated with the high MIB-1 LI in glioblastomas (P < 0.05). Multivariate analysis revealed that the S1P1 expression level was a significant prognostic factor. Our results indicate that the MIB-1 LI is an important prognostic factor in human glioblastomas. Furthermore, downregulation of S1P1 expression increases proliferative activity, and thus enhances the malignancy of glioblastomas, resulting in a poor survival.
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Acknowledgments
This work was funded by Grants-in-aid for young scientists’ research from the Japanese Ministry of Education, Science, Sports, Technology, and Culture (B-19790992 to M.N.), and grants from The Japan Brain Foundation (to M.N.), The Foundation for Promotion of Cancer Research (to M.N.), and The Hokkoku Cancer Research Foundation (to M.N., D.K., Y.H., and JI. H.). Akiko Imamura assisted with immunohistochemistry for MIB-1.
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Yoshida, Y., Nakada, M., Harada, T. et al. The expression level of sphingosine-1-phosphate receptor type 1 is related to MIB-1 labeling index and predicts survival of glioblastoma patients. J Neurooncol 98, 41–47 (2010). https://doi.org/10.1007/s11060-009-0064-5
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DOI: https://doi.org/10.1007/s11060-009-0064-5