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Objective: The principal purpose of this study was to determine the relationship between level of plasma D-dimer and survival time in metastatic gastric cancer patients. Methods: We retrospectively collected the data of plasma D-dimer in metastatic gastric cancer patients admitted in our Department (Department of Oncology, The Affiliated Changzheng Hospital, The Second Military Medical University, Shanghai, China) from October 2006 to October 2008 and analyzed the relationship between level of plasma D-dimer and survival time along with other clinicopathologic parameters. Results: A total of 82 patients were studied in our research, 52 were males and 30 females, and the mean age was 57 years. The 48 cases had a normal plasma D-dimer level (< 300 μg/L) and 34 had a high plasma D-dimer level (≥ 300 μg/L). In the normal and high plasma D-dimer level groups, the mean survival times were 10.9 (95% CI: 9.8-12.2) months and 6.8 (95% CI: 4.4-7.6) months respectively, and the difference was statistically significant. Conclusion: Metastatic gastric cancer patients with high plasma D-dimer level had significantly shorter survival time than those with normal plasma D-dimer level. Level of plasma D-dimer can be referred as a potential predictor in metastatic gastric cancer patients.