Report discounts value of many 'biomarkers' in predicting disease

Studies linking a gene, protein or another substance to a disease are often called into question by later, larger studies, a review shows.To gauge a patient's risk for disease, doctors often look at blood levels of certain proteins or at other "biomarkers" — cholesterol to gauge heart risk, say, or bone density for fracture risk. And every day, more biomarkers are found, and are often described in the news with much fanfare.

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