Abstract
The clinical significance of low-frequency microsatellite instability (MSI-L) in gastric cancer (GC) has not been well established. The aim of this study was to evaluate the clinicopathological features of MSI-L in GC. We investigated microsatellite instability (MSI) in 5 di-nucleotide repeat sequences in 210 unselected GC patients. High-resolution fluorescent microsatellite analysis assay was utilized to detect MSI. Clinicopathological variables were compared among groups with different microsatellite statuses. The overall survival (OS) was analyzed by Kaplan–Meier method. Multivariable analysis was performed to identify prognostic factors and variables correlated with lymph node metastasis. High-frequency microsatellite instability (MSI-H), MSI-L, and microsatellite stable were identified, respectively, in 10.5, 10.0, and 79.5 % of unselected GC cases. Tumors with MSI-H were less invasive, and these patients showed a better OS. MSI-L was correlated with more advanced tumor Node Metastasis stage, and more frequent lymph node metastasis. The unfavorable prognosis predicted by MSI-L was ascribed to its correlation with lymphatic invasion. MSI-L characterized by di-nucleotide markers represents a distinct subcategory of GC with aggressive clinicopathological features, which are particularly affiliated to lymphatic system and correlated with a poor prognosis. MSI-L could be beneficial for predicting the clinical outcome of GC.
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Acknowledgments
We sincerely thank Dr. Shinya Oda, Dr. Eiji Oki, Prof. Yoshihiro Kakeji, Prof. Zhiwei Zhou, Prof. Huimian Xu, and Prof. Qiang Wang for providing critical comments on our manuscript. We offer our sincere gratitude to Prof. Yoshihiko Maehara for his generous support. The current study was supported by “Liaoning BaiQianWan Talents Program” #2010921037, a grant from the National Ministry of Human Resources and Social Security of China #2011LX005, and the National Science Foundation of Liaoning Province, China #201102110.
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Zhao, Y., Zheng, ZC., Luo, YH. et al. Low-Frequency Microsatellite Instability in Genomic Di-Nucleotide Sequences Correlates with Lymphatic Invasion and Poor Prognosis in Gastric Cancer. Cell Biochem Biophys 71, 235–241 (2015). https://doi.org/10.1007/s12013-014-0189-9
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DOI: https://doi.org/10.1007/s12013-014-0189-9