Figure 1.

Identification of optimal cutoff values of age (a, b), tumor size (c, d), the number of regional lymph nodes by pathological findings (e, f), pLNs (g, h), and LNR (i, j) via X-tile software analysis. Optimal cutoff values of age were identified as 47 and 71 years based on overall survival. Optimal cutoff values of tumor size were identified as 19 mm and 40 mm based on overall survival. Optimal cutoff values of the number of regional lymph nodes by pathological findings were identified as 11 and 32 based on overall survival. The optimal cutoff values of pLNs were 1 and 16 based on overall survival. The optimal cutoff values of LNR were 20% and 50% based on overall survival.