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Kaplan-Meier overall survival curves for (A) all 103 gastric cancer (GC) patients, and (B) 80 GC patients who underwent curative surgery, according to the level of microRNA-21 (miR-21) expression. Log-rank tests showed that there were no significant differences between the low miR-21 expression and the high miR-21 expression groups (P=0.634 and P=0.863, respectively).
