Table 4. Univariate and multivariate analyses to identify clinicopathological and operative variables that are associated with overall survival.

Values are presented as number (%). Tumor stages are based on the TNM classification system from the 7th edition of the Union for International Cancer Control/American Joint Committee on Cancer. Univariate P-values were obtained by Mann-Whitney U-test, the chi-squared test or the Kruskal-Wallis test. OR = odds ratio; CI = confidence interval. ^*Leukocytosis is defined as white blood cell >10,000/µl. ^†Hypoalbuminemia is defined as serum albumin <3.5 g/dl.