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...addition, some clinicians have frozen bloodsamples from large samples of healthy subjects andseveral years later compared levels of betacarotene. Those who contracted cancer had,researchers found, a significantly lower level ofbeta carotene in their blood than the healthypopulation...
Conclusive proof of a link between betacarotene and cancer, says Hennekens, will comeabout only through the completion of a large-scalecomparison like the Physicians Health Trial, inwhich researchers carefully isolate the effect ofbeta carotene from all other substances with whichit naturally occurs...
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