Figure 2. Kaplan–Meier analyses of recurrence-free survival rates in patients with pancreatic neuroendocrine tumor G1 according to risk score. The risk score indicates the number of risk factors for recurrencefree survival, such as the presence of lymph node metastasis and the presence of microvascular invasion, as determined via a univariate analysis. The 3, 5, and 10-year recurrence-free survival rates of patients with risk scores of 0 (n=79) and 1-2 (n=18) were 100%, 100%, and 100% and 94%, 88%, and 71%, respectively (p<0.001).