Objectives: This study aimed to determine the predictive factors of BK virus viremia/nephropathy in kidney transplant recipients and to evaluate the effects of low-dose tacrolimus plus everolimus.
Materials And Methods: This study included 3654 kidney transplant recipients. The patients were divided into 2 groups: group 1 were BK virus negative (n = 3525, 96.5%) and group 2 were BK virus positive (n = 129, viremia 3.5%, nephropathy 1%). Predictive factors were determined by receiver operating characteristic curve analysis and logistic regression models.We also divided and analyzed patients with BK virus viremia/nephropathy into 2 groups according to immunosuppressive changes. Group 2a had been switched to low-dose tacrolimus plus everolimus (n = 54, 41.9%), and group 2b had been switched to other immunosuppressive protocols (n = 75, 58.1%).
Results: We found that use of anti-T-cell lymphocyte globulin and tacrolimus, deceased donor transplant, and rejection were predictive factors for BK virus viremia/nephropathy. In addition, patients who had low-dose calcineurin inhibitor plus mammalian target of rapamycin inhibitor regimens showed a low rate of BK virus development(only 6.2% of all cases). In Group 2a, both the BK polyomavirus-associated nephropathy rate (n = 23 [42.6%] vs n = 12 [16%] in group 2b; P = .001) and viral load (DNA > 104 copies/mL) (n = 49 [90.7%] vs n = 27 [36%] in group 2b; P = .001) were increased versus group 2b. Graft function, graft survival, viral clearance, and rejection rate were similar between the groups after protocol change.
Conclusions: BK virus viremia/nephropathy rate was lower in patients who received low-dose calcineurin inhibitor plus mammalian target of rapamycin inhibitor protocols; the low-dose tacrolimus plus everolimus switch protocol after BK virus was more effective and safe than other protocols.
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