Univariate analyses of survival prognostic factors.

NA = not available; N = not enough events to calculate upper 95% CI boundary; NS = not significant. Age, KPS and extent of surgery are treated as ordinal variables.Univariate analyses of survival prognostic factors.

NA：无可用数据（not available）；N：事件数不足，无法计算95%置信区间（confidence interval, CI）的上限边界；NS：无统计学显著性（not significant）。年龄、卡氏功能状态评分（Karnofsky Performance Status, KPS）以及手术切除范围均被视为有序分类变量。本研究针对生存预后因素开展了单因素分析。