SUNDAY, Jan. 22 (HealthDay News) -- Researchers have identified three new genomic regions they believe are linked with breast cancer that may help explain why some women develop the disease.
All three newly identified areas "contain interesting genes that open up new avenues for biological and clinical research," said researcher Douglas Easton, a professor of genetic epidemiology at the University of Cambridge in England.
Breast cancer is the most common cancer among women, with about 1 million new cases annually worldwide and more than 400,000 deaths a year.
Scientists conducting genome-wide association studies -- research that looks at the association between genetic factors and disease to pinpoint possible causes -- had already identified 22 breast cancer susceptibility loci. Locus is the physical location of a gene or DNA sequence on a chromosome.
"The three [newly identified] loci take the number of common susceptibility loci from 22 to 25," said Easton.
However, the three new susceptibility loci might explain only about 0.7 percent of the familial risks of breast cancer, bringing the total contribution to about 9 percent, the researchers said.
Michael Melner, scientific program director for the American Cancer Society, said this current research adds some important new clues to existing evidence, but he agreed that the number of cases likely associated with these three variants is probably low.
"So the total impact in terms of patients would be fairly small," Melner said.
The study is published online Jan. 22 in Nature Genetics.
To find the new clues, Easton's team worked with genetic information on about 57,000 breast cancer patients and 58,000 healthy women obtained from two genome-wide association studies.
The investigators zeroed in on 72 different single nucleotide polymorphisms (SNPs). A SNP -- pronounced "snip"
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