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Protein-based urine test predicts kidney transplant outcomes
Date:8/22/2013

Levels of a protein in the urine of kidney transplant recipients can distinguish those at low risk of developing kidney injury from those at high risk, a study suggests. The results also suggest that low levels of this protein, called CXCL9, can rule out rejection as a cause of kidney injury. The study appears online Aug. 22 in the American Journal of Transplantation. The work was funded by the National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health.

To prevent rejection, kidney transplant recipients typically take immunosuppressive drugs every day. However, these drugs can cause kidney damage and lead to other serious side effects such as cancer, infection and infertility. Even with immunosuppressive therapy, 10 to 15 percent of kidney recipients experience rejection during the first year after transplantation.

Currently, the only definitive way to distinguish rejection from other causes of kidney injury is by performing a biopsy, in which doctors remove a small piece of kidney tissue to look for rejection-associated damage. Although this procedure is generally considered safe, it carries some minor risks for the patient and does not always provide an accurate impression of the overall state of the kidney.

"A noninvasive urine test to accurately monitor the risk of kidney rejection could dramatically reduce the need for biopsies and possibly enable doctors to safely reduce immunosuppressive therapy in some patients," said NIAID Director Anthony S. Fauci, M.D. "The results of this study support the further development of noninvasive tests for the detection and management of transplant rejection."

In this multicenter Clinical Trials in Organ Transplantation study, doctors periodically collected urine samples from 280 adult and child kidney transplant recipients for two years after transplantation. Investi
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Contact: Hillary Hoffman
hillary.hoffman@nih.gov
301-402-1663
NIH/National Institute of Allergy and Infectious Diseases
Source:Eurekalert

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