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Prognostic value of C3d-fixing, preformed donor-specific antibodies in crossmatch-positive living kidney transplantation.
Transplant Immunology ( IF 1.624 ) Pub Date : 2019-08-06 , DOI: 10.1016/j.trim.2019.101230
Katsunori Miyake,Masayoshi Okumi,Yoichi Kakuta,Kohei Unagami,Miyuki Furusawa,Hideki Ishida,Kazunari Tanabe

The occurrence of acute antibody-mediated rejection (ABMR) is higher in flow cytometric crossmatch (FCXM)-positive patients despite desensitization. Accumulating evidence suggests a correlation between the complement-binding ability of donor-specific antibodies (DSAs) and the risk of ABMR. Here, we investigated the correlation between complement C3d-fixing ability of preformed DSA and ABMR risk, the efficacy of a desensitization protocol for patients with C3d-fixing DSA, and the risk of ABMR in 21 DSA- and FCXM-positive patients. We retrospectively analyzed the C3d-fixing ability and mean fluorescence intensity (MFI) of preformed DSA before and after desensitization. Six patients had non-C3d-fixing DSA and 15 had C3d-fixing DSA. The presence of C3d-fixing DSA before desensitization was correlated with the incidence of acute ABMR within 1 year after transplantation (p = .04) and chronic ABMR (p = .03). Moreover, the MFI of preformed DSA differed between responder and non-responder C3d-fixing DSA after desensitization (p < .0001). The C3d-fixing ability of preformed DSA with low MFI disappeared after desensitization. These results indicate that measuring DSA C3d-fixing ability may identify patients with a high risk of ABMR, especially before desensitization. CLINICAL TRIAL NOTATION: UMIN Clinical Trials Registry (UMIN-CTR) number: UMIN000033449.
更新日期:2019-11-01

 

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