Figure 4. Overall survival curves (Kaplan-Meier) for all patients and for patients undergoing adjuvant chemotherapy according to dissection method. a. In survival analyses for all patients, 1- and 3- year survival rates were 84.2% (n=29) and 52.8% (n=10) in the left posterior approach (LPA) group and 82.9% (n=29) and 17.1% (n=6) in the control group, respectively. The difference was significant (P=0.016). b. Even in the subgroup of patients undergoing postoperative chemotherapy, postoperative survival improved in the left posterior approach group (1- and 3-year survival rates: 85.2% (n=26) and 57.5% (n=9), respectively) as compared to the control group (1- and 3-year survival rates: 85.0% (n=20) and 20.0% (n=4), respectively; P=0.038). The log-rank test was applied.