人群干预试验表明β－胡萝卜素没有预防肺癌的作用吴永宁陈君石流行病学研究发现多吃蔬菜和水果可以降低多种人类癌症的发生［１，２］，这一结果已为广大科学家所认同。自英国牛津大学Ｐｅｔｏ等［３］于１９８１年提出蔬菜和水果的防癌作用可能与其所含的β－胡萝卜素有... Crowd intervention trials show that β-carotene does not prevent lung cancer. Wu Yongning Chen Junshi epidemiological study found that eating more vegetables and fruits can reduce the incidence of a variety of human cancers [1,2], the result has been recognized by the majority of scientists. Peto et al [3] from the University of Oxford in England proposed in 1981 that the anti-cancer effect of vegetables and fruits may be related to the β-carotene contained therein.