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Acute Rejection, Kidney Allograft Function, and Graft Survival in Patients with Circulating Pre-Transplant IgG Antibodies Directed Against Donor HLA-A, -B, or -C Locus Determined Antigens.
Clinical Transplants 2016
The relationship between circulating pre-transplant immunoglobulin G (IgG) antibodies to donor human leukocyte antigen (HLA) -C locus determined antigens alone and acute rejection, kidney allograft function, and graft survival is not fully defined. Also, the impact of circulating pre-transplant IgG antibodies to donor HLA-C locus antigens alone on these outcomes has not been compared with the impact of circulating pre-transplant IgG antibodies to donor HLA-A or -B locus antigens. We conducted a retrospective review of records of 1252 kidney allograft recipients transplanted at our center between January 2010 and January 2016 to identify patients with circulating pre-transplant IgG antibodies directed at kidney donor HLA-A, -B, or -C locus determined antigens. Antibodies were detected and reported using the LABScreen Single Antigen Bead assay with microbeads coated with single HLA class I antigens. Pre-transplant and post-transplant data were collected and the graft outcomes of 16 kidney graft recipients with antibodies to HLA-C locus antigens were compared to the outcomes in 56 recipients with antibodies to HLA-A or -B locus determined antigens. The one-year acute rejection rate was 6% in those with donor-specific antibodies (DSA) to HLA-C locus antigens and 20% in those with DSA to HLA-A or -B locus antigens. The graft survival rate was 100% in those with DSA to HLA-C locus antigens and 95% in those with DSA to HLA-A or -B locus antigens. None of the numerical differences were statistically significant (p>0.05). The presence of circulating pre-transplant IgG antibodies directed at kidney donor HLA-C locus antigens alone may not be associated with an increased risk of acute rejection or a decreased graft survival rate. Our observations support the concept that circulating pre-transplant IgG antibodies directed at kidney donor HLA-C locus antigens alone do not negatively impact kidney allograft outcomes and that the mean fluorescence intensities of the antibodies directed at HLA-C locus alone should not be used to list unacceptable HLA-C locus antigens for kidney allocation. A study with a larger cohort is needed to investigate our hypothesis.
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