Figure 5. Overall survival curves according to dissection method in the positive regional node subgroup. The left posterior approach had a better survival rate as compared to the control group (P=0.004). The 1- and 3-year survival rates were 90.2% (n=16) and 53.2% (n=5) in the left posterior approach (LPA) group and 80.0% (n=16) and 16.0% (n=2) in the control group, respectively. The log-rank test was applied.