预防胃肠道癌症的抗氧化剂补充剂:系统审查和元分析
Goran Bjelakovic1, Dimitrinka Nikolova, Rosa G Simonetti
1The Cochrane Hepato-Biliary Group, Copenhagen Trial Unit, Centre for Clinical Intervention Research, Copenhagen University Hospital, H:S Rigshospitalet, Copenhagen, Denmark. goranb@junis.ni.ac.yu
抗氧化剂补充剂不能预防胃肠道癌症,可能会增加整体死亡率. 需要进一步的研究来探索.
科学领域:
- 在瘤学瘤学.
- 营养科学 营养科学
- 预防医学 预防医学
背景情况:
- 氧化应激是已知的致癌因素之一.
- 抗氧化剂补充剂在预防癌症中的作用需要研究.
研究的目的:
- 确定抗氧化剂补充剂是否可以降低胃肠道癌症的发生率.
- 评估抗氧化剂补充剂对整体死亡率的影响.
主要方法:
- 使用Cochrane协作方法的随机对照试验 (RCT) 的系统审查和元分析.
- 在2003年2月之前搜索相关试验的电子数据库和参考列表.
- 分析了包括癌症发病率,总死亡率和使用固定效应和随机效应模型的不良影响在内的结果.
主要成果:
- 包括14个RCT (n=170,525);试验质量一般很高.
- 抗氧化剂补充剂 (β-胡卜素,维生素A,C,E,) 并没有显著降低胃肠道癌症发生率.
- 高质量的试验表明,抗氧化剂补充剂显著增加了整体死亡率,特别是β-胡卜素与维生素A或E的组合.
结论:
- 目前的证据不支持使用抗氧化剂补充剂预防胃肠道癌症.
- 抗氧化剂补充剂似乎会增加整体死亡率.
- 的潜在预防作用需要在精心设计的RCT中进行进一步的研究.
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