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Gene Variant Boosts Risk of Severe Diabetic Eye, Kidney Diseases
Date:5/8/2008

Finding suggests careful use of blood-boosting drugs in anemia patients

THURSDAY, May 8 (HealthDay News) -- A gene called erythropoietin (EPO) is linked to severe diabetic eye and kidney diseases, a new study finds.

The study, led by a researcher at the John A. Moran Eye Center at the University of Utah, included 1,618 people with proliferative diabetic retinopathy (PDR) and end-stage renal disease (ESRD) and 954 diabetic patients without any eye or kidney disease.

PDR is the most common cause of legal blindness in working-age adults in the United States, accounting for 10 percent of new onset blindness overall. Diabetes is the leading cause of ESRD.

The researchers found that people with a copy of mutant EPO gene have an increased risk of developing PDR and ESRD.

"We know that the development of PDR and ESRD in diabetic patients can be inherited. Although genetic factors are known to be important in the susceptibility [or resistance] to these complications, until now, the genes involved have been mostly unknown," study leader Dr. Kang Zhang, director of the division of ophthalmic genetics at the Moran Eye Center and an associate professor of ophthalmology and visual sciences, said in a prepared statement.

The study was published online May 5 in the Proceedings of the National Academy of Sciences.

This finding may affect the use of EPO in treating patients with anemia, Zhang said.

EPO is used extensively to help in the production of red blood cells when treating patients with anemia resulting from renal failure or chemotherapy. In the United States, erythropoietin represents one of the largest single drug expenses for the Center for Medicare & Medicaid Services, approximately one billion dollars per year," Zhang said.

"Patients with anemia due to chronic renal disease [many of whom have diabetes] who receive frequent dosing of EPO to maintain higher hem
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