Figure 8: The Kaplan-Meier curves using classification into four groups according to BMI (BMI ≥ 30 kg/m^{2} (), 30 kg/m^{2} > BMI ≥ 25 kg/m^{2} (), 25 kg/m^{2} > BMI ≥ 18.5 kg/m^{2} (), and BMI < 18.5 kg/m^{2} ()). In terms of overall survival () and recurrence-free survival (), the overall difference in these four groups did not reach significance ((a) and (b)).