Comparison of kidney transplant outcomes in HLA compatible and incompatible transplantation: A national cohort study
Reports of HLA incompatible (HLAi) kidney transplant outcomes are inconclusive, especially in the context of lower level Donor Specific Antibodies (DSA).METHODS:
Multi-centre national cohort study of HLAi kidney transplant recipients matched in 1:2 ratio with HLA compatible (HLAc) kidney transplant recipients. HLAi defined as DSA identified by Luminex. Antibody mediated rejection (AMR) and transplant-survival were analysed using Kaplan-Meier plots. Propensity score (PS) matching was used to compare recipient and transplant survival between groups.RESULTS:
We included 61 HLAi and 122 HLAc recipients; mean age 46 years; 60% female. MFIT0 : 3327 (IQR 1352-6458), 23 (38%) were Flow cytometry crossmatch positive (FC-XMPOS ). DSAPOS /FC-XMPOS transplantation carried an increased risk of AMR at 1 year (52%) compared to DSAPOS /FC-XMNEG (27%) and HLAc (0%). Unadjusted death censored graft loss at 3 years was 13% (HLAi) and 8% (HLAc). Three-year patient survival was 95% in HLAc, 84% in DSAPOS /FC-XMNEG and 69% in DSAPOS /FC-XMPOS recipients; 58% of HLAi deaths were infection-related. HLA incompatibility was associated with a decreased 3-year survival in our PS-matched cohort.CONCLUSION:
In kidney transplantation, DSA and positive FC-XM carries an increased risk of AMR. Despite inferior transplant and survival outcomes compared to HLAc transplantation, it remains a realistic option for highly sensitized patients facing prolonged waiting times and reduced survival on dialysis.
|LEVEL OF EVIDENCE:||Case Series / Case Control / Cohort|
|KEYWORDS:||HLA incompatible transplantation; antibody mediated rejection; donor specific antibody; flow-cytometry crossmatch|
|MESH HEADINGS:||Humans; Female; Middle Aged; Male; Kidney Transplantation; HLA Antigens; Graft Rejection; Cohort Studies; Renal Dialysis; Histocompatibility Testing; Graft Survival; Antibodies; Retrospective Studies; Isoantibodies|