Association of MT staining and clinicopatological factors. Tumor type not taken into account.

Heterogeneity of studies analyzed using Cochran's Q-test (p-value displayed) and using I2. Egger's two-tailed test used for publication bias analysis (p-value displayed). * effect measure is odds ratio, OR, except for survival analysis using hazard ratio, HR. CI, confidence interval

采用科克伦Q检验（Cochran's Q-test）与I²统计量对纳入研究的异质性进行分析，并报告对应P值；采用埃格尔斯双侧检验（Egger's two-tailed test）开展发表偏倚分析，同样报告检验所得P值。* 本研究的效应量为比值比（odds ratio, OR），仅生存分析采用风险比（hazard ratio, HR）。CI即置信区间（confidence interval, CI）。