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Gene Variants Can Predict Threat of Heart Disease
Date:3/19/2008

Cholesterol-associated variants increase risk and may be early indication, study shows

WEDNESDAY, March 19 (HealthDay News) -- A combination of cholesterol-associated gene variants can increase a person's risk for heart attack, stroke or sudden cardiac death, Massachusetts General Hospital researchers report.

It may someday be possible to test for these gene variants in order to identify patients who may require more intense monitoring and might benefit from earlier use of cholesterol-lowering medications and other measures to reduce their increased risk for cardiovascular events, the researchers said.

"We feel that our data provides two insights," study lead author Dr. Sekar Kathiresan, director of preventive cardiology at MGH, said in a prepared statement. "First, we provide a foundation for the possibility that a panel of gene variants will eventually be useful in preventive cardiac care. Second, we show that the combination of multiple variants related to cholesterol importantly contribute to the genetic risk for heart attack."

In analysis of data from 5,414 Swedish adults, Kathiresan and colleagues focused on a combination of 9 single-nucleotide polymorphisms (SNPs) previously associated with cholesterol levels. The researchers also looked at the participants' high-density lipoprotein (HDL) and low-density lipoprotein (LDL) cholesterol levels, and their subsequent medical histories.

The participants were given a genotype score, ranged from 0 to 18, based on how many copies of the unfavorable SNPs they had. Those with higher genotype scores had higher LDL (bad) cholesterol and lower HDL (good) cholesterol levels. Those with genotype scores of 11 or higher had a 63 percent greater risk of a cardiovascular event than those with score of nine or lower.

In the overall study population, testing for the panel of nine SNPs was no better than standard risk factors for predicting risk of cardiac even
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