2013 Banff Criteria for Chronic Active Antibody-Mediated Rejection: Assessment in a Real-Life Setting

Area of Science:

• Nephrology
• Transplantation Immunology
• Pathology

Background:

• The Banff classification provides criteria for diagnosing kidney transplant rejection.
• Recent updates in the 2013 Banff classification for chronic active antibody-mediated rejection (CAABMR) have altered diagnostic thresholds.
• The clinical significance of these changes requires evaluation.

Purpose of the Study:

• To compare the 2007 and 2013 Banff criteria for CAABMR.
• To assess the association of these criteria with clinical outcomes, specifically death-censored graft failure or doubling of serum creatinine.

Main Methods:

• Retrospective analysis of 123 kidney transplant recipients meeting morphologic criteria for chronic tissue injury.
• Comparison of patient classification using 2007 and 2013 Banff criteria.
• Cox proportional hazards modeling to evaluate association with graft failure or creatinine doubling.

Main Results:

• The 2013 criteria identified a higher proportion of patients (36%) compared to the 2007 criteria (18%).
• A 2013 diagnosis of CAABMR was significantly associated with adverse graft outcomes (aHR 2.5), while the 2007 diagnosis was not (aHR 1.6).
• The C4d component of the 2013 criteria, not glomerulitis or peritubular capillaritis, was significantly associated with outcomes.

Conclusions:

• The 2013 Banff classification criteria for CAABMR improve the identification of patients at risk for graft failure.
• The updated C4d threshold in the 2013 criteria is a key driver of improved outcome prediction.
• Further research is needed to clarify the role of other components in the 2013 criteria.