Word: effected
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Dates: during 1990-1990
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Many--but not all--of those scientists examining beta carotene have joined together on the Physicians' Health Study, a massive project involving as subjects 22,071 male physicians between 40 and 84 years old. The study was designed to test the effect of aspirin on heart disease and beta carotene on cancer...
Researchers cut short the aspirin half of the study in 1988, after preliminary data showed incontrovertably that aspirin has a beneficial effect on heart disease. Overseers of the study said they felt that to continue giving half of the subjects placebo pills instead of aspirin was unethical, as was withholding the clear scientific evidence of aspirin's positive benefits...
...particular, two compelling pieces ofscientific evidence point to beta carotene'santi-carcinogenic effect. For one, clinicalresearchers have shown that cancer victims have,in general, consumed less of the chemicalthroughout their lives: "You basically see thatthose individuals who have cancer report a dietlow in beta carotene," says Hennekens...
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...
...again in 1984, researchers foundthat the chemical may ward off breast cancer. Morerecent studies have pointed to the molecule'sbeneficial effect on ovarian and lung cancer...