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Kaplan-Meier estimates of RFS between CD9-positive GST and CD9-negative GST group. The hazard ratio for RFS in the CD9-positive group was 0.104 (95% CI, 0.021 to 0.528; P = 0.006) compared with the CD9-negative group. RFS curves were constructed using the Kaplan-Meier method. Differences between the curves were tested for statistical significance using Log-rank statistics.
