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Urine biomarker test can diagnose as well as predict rejection of transplanted kidneys
Date:7/3/2013

er, which contributed 122 of the total 485 kidney transplant patients.

The gene-expression studies were led by Dr. Suthanthiran with his laboratory serving as the Gene Expression Monitoring (GEM) core and the clinical trial was led by Dr. Abraham Shaked, director of the PENN Transplant Institute at the Perelman School, on behalf of the Clinical Trials in Organ Transplants 04 (CTOT-04) Study Investigators. The GEM core was blinded to the clinical status of the patients including their biopsy results and the data collection and analysis were performed by an independent statistical center sponsored by NIH.

Researchers collected 4,300 urine specimens during the first year of transplantation, starting at day three post-transplantation. The urine samples were shipped to the GEM core at Weill Cornell Medical College, where analysis of the urine revealed that the three gene-based biomarkers signature could distinguish kidney recipients with biopsy confirmed rejection from those whose biopsies did not show signs of rejection or who did not undergo a biopsy because there was no clinical sign of rejection.

The researchers used the signature to derive a composite score and identify a threshold value indicative of rejection. This score accurately detected transplant rejection with a low occurrence of false-positive and false-negative results. "It is about 85 percent accurate, which is much higher than the creatinine test used today," Dr. Suthanthiran says. Investigators then validated the diagnostic signature by obtaining similar results when they tested a set of urine samples collected in a separate CTOT clinical trial.

Dr. Suthanthiran anticipates conducting another NIH-funded clinical trial to test whether the signature test can be used to personalize individual immunosuppressive therapy. He says that NIH is also interested in submitting the test to the federal Food and Drug Administration for approval.


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Contact: Linda Kamateh
lib9027@nyp.org
212-821-0560
Weill Cornell Medical College
Source:Eurekalert

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