REYKJAVIK, Iceland -- Scientists in Iceland said they have found a fourth set of genetic variants linked to an increased risk of estrogen receptor-positive breast cancer. The findings, published in the journal Nature genetics, are being used to develop a DNA test to identify women who should be closely screened at an early age for the disease, the biopharmaceutical company deCode Genetics said Sunday in a release. The test is expected to be released later this year, the company's report said. Researchers reported the discovery of two common single-letter variants on chromosome 5 of the human genome that are associated with risk of estrogen receptor-positive breast cancer. They said more than 60 percent of the general...
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