Univariate and multivariate analysis for overall survival.

Abbreviations: AJCC, American Joint Committee on Cancer; G1, well differentiated; G2, moderately differentiated; G3, poorly differentiated; G4, undifferentiated; HR, hazard ratio; CI, confidence interval.缩写说明：AJCC - 美国癌症联合委员会 (American Joint Committee on Cancer)；G1 - 高分化 (well differentiated)；G2 - 中分化 (moderately differentiated)；G3 - 低分化 (poorly differentiated)；G4 - 未分化 (undifferentiated)；HR - 风险比 (hazard ratio)；CI - 置信区间 (confidence interval)