Abstract
Background
Microsatellite instability (MSI) is one of the leading mechanisms for the carcinogenesis of gastric cancer. Its prognostic value is controversial.
Methods
Between May 1988 and Oct 2003, a total of 214 gastric cancer patients undergoing curative surgery were enrolled, and their MSI statuses were classified as MSI-H (high) or MSI-L/S (low/stable). The clinicopathologic characteristics of MSI-H and MSI-L/S gastric cancers were compared.
Results
The MSI-H tumors accounted for 11.7 % (n = 25) of the 214 total gastric cancers. Although not statistically significant, the MSI-H gastric cancers were more frequently located in the lower third of the stomach (64 % vs. 49.2 %) and were more often the intestinal type (72 % vs. 61.4 %) compared to the MSI-L/S gastric cancers. The MSI-H gastric cancers had a significantly better 5-year overall survival (OS) rate (68 % vs. 47.6 %, p = 0.030) and a trend of a better 3-year disease-free survival rate (71.8 % vs. 55.2 %, p = 0.076) compared to the MSI-L/S gastric cancers. A multivariate analysis revealed that pathologic TNM stage and MSI status were the independent prognostic factors for OS after curative surgery.
Conclusions
Compared to MSI-L/S tumors, MSI-H tumors are associated with a better OS rate for gastric cancer patients after R0 resection.
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Acknowledgments
This research was supported by the Center of Excellence for Cancer Research at Taipei Veterans General Hospital (DOH101-TD-C-111-007) and funding from the National Science Council (99-2314-B-075-009).
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Fang, WL., Chang, SC., Lan, YT. et al. Microsatellite Instability Is Associated With a Better Prognosis for Gastric Cancer Patients After Curative Surgery. World J Surg 36, 2131–2138 (2012). https://doi.org/10.1007/s00268-012-1652-7
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DOI: https://doi.org/10.1007/s00268-012-1652-7