Abstract

Objective To analyze the incidence of BK virus (BKV) infection after kidney transplantation in our center and to evaluate the efficacy and safety of conversion treatment with Mizoribine (MZR) on BKV infection after kidney transplantation. Methods The information of recipients who received BK virus screening in hospital or outpatient during 2015-02 to 2016-12 in our center was retrospectively analyzed. The recipients positive for BKV were divided into experiment group (given conversion treatment with MZR) and control group (not given MZR conversion) according to the inclusion criteria. The negative rate of BKV, AR, hyperuricemia and the function of renal allograft during the conversion treatment with MZR were observed. Results 182 recipients accepted BKV screening during 2015-02 to 2016-12 and 68 cases were positive. The positive rate of BKV was 38.5%. The positive rate of peripheral blood specimens and midstream urine specimens was 7.1% and 36.8% respectively. Twelve recipients were positive for BKV in both peripheral blood specimens and midstream urine specimens. There were 27 recipients in experiment group and 36 cases in control group. Fourteen recipients positive for BKV became negative after MZR conversion in experiment group and the negative rate was up to 51.9%. The mean time of negative rate was 3.2±2.7 (1-10) months after MZR conversion. During the conversion treatment with MZR, AR occurred in 1 case and was reversed by the impact therapy with Thymoglobulin in experiment group. The value of serum uric acid was maintained stable before and after MZR conversion under the action of uric-acid-lowering drug. The renal function was kept stable in both experiment group and control group after renal transplantation. No deaths and renal allograft failure cases occurred in both groups during the research period. The 2-year survival rate for patients and kidneys was both 100%. Conclusion The incidence of BKV infection after kidney transplantation was high and the treatment scheme of MZR conversion was safe and effective. Key words: kidney transplantation; BK virus infection; Mizoribine; Treatment

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