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Donor-specific antibodies: can they predict C4d deposition in pediatric heart recipients?
David M Peng1, Yuk M Law, Mariska S Kemna
1University of Washington/Seattle Children's Hospital, Seattle, WA, USA. david.peng@me.com
Insights
Quantifying donor-specific antibodies (DSA) significantly improves the prediction of C4d deposition, a marker of antibody-mediated rejection (AMR), in pediatric heart transplant recipients. This quantitative approach enhances surveillance for AMR post-transplant.
Area of Science:
- Cardiology
- Immunology
- Transplantation
Background:
- Surveillance for antibody-mediated rejection (AMR) in pediatric heart recipients relies on various markers, including C4d deposition.
- The utility of circulating donor-specific antibodies (DSA) in predicting AMR requires further investigation, particularly regarding quantitative measures.
Purpose of the Study:
- To evaluate if quantifying DSA improves the prediction of C4d deposition, a key diagnostic criterion for AMR.
- To establish a quantitative threshold for DSA that correlates with C4d positivity in pediatric heart transplant recipients.
Main Methods:
- Retrospective review of pediatric heart recipients transplanted between 10/2005 and 1/2011.
- Analysis of paired DSA and endomyocardial biopsy (EMB) data, defining C4d+ as >25% endothelial cell staining.
- Utilizing receiver-operating characteristic (ROC) plots to identify DSA thresholds for predicting C4d+.
Main Results:
- A total of 183 paired DSA-EMB determinations from 60 patients were analyzed.
- A single-antibody median fluorescence intensity (MFI) threshold of >6000 strongly correlated with C4d+ (p < 0.0001).
- This threshold demonstrated high specificity (0.95) and negative predictive value (0.97) for C4d+.
Conclusions:
- Quantitative DSA measurement, using institution-specific MFI thresholds, significantly enhances the prediction of C4d deposition in pediatric heart transplant recipients.
- Quantifying DSA should be integrated into post-transplant surveillance protocols for improved AMR detection.
- This approach strengthens the diagnostic power for identifying AMR in this vulnerable patient population.
Abstract:
There is limited evidence regarding the utility of circulating DSA in surveillance for AMR of pediatric heart recipients. Our hypothesis is that quantitation of DSA improves their power for predicting a C4d+, an integral component in the current diagnostic criteria of AMR. All pediatric recipients transplanted between 10/2005 and 1/2011 were retrospectively reviewed for DSA determined within 48 h of EMB. C4d+ was defined as >25% endothelial cell staining by immunohistochemical methods. A total of 183 paired DSA-EMB determinations were identified in 60 patients, a median of three paired studies per patient (range: 1-9). DSA were detected in 60 of these determinations. A receiver-operating characteristic plot identified a threshold single-antibody MFI of >6000 that strongly correlated with C4d+ (p < 0.0001) with a high negative predictive value (0.97) and specificity (0.95). The sensitivity and positive predictive values were 0.71 and 0.60, respectively. The predictive power of single-antigen DSA for C4d deposition was improved in pediatric heart recipients using an institution-specific MFI threshold value. In post-transplant care, quantitative DSA should be an essential component in the surveillance for AMR.
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