alexa Reducing immunosuppression preserves allograft function in presumptive and definitive polyomavirus-associated nephropathy.
Psychiatry

Psychiatry

Journal of Addiction Research & Therapy

Author(s): Schaub S, Hirsch HH, Dickenmann M, Steiger J, Mihatsch MJ,

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Abstract Early detection of polyomavirus BK (BKV) viremia and reduction of immunosuppression is recommended for preventing polyomavirus-associated nephropathy (PyVAN), but systematic histological evaluations were not performed in previous studies. We routinely screen for decoy cells and, if positive, measure plasma BKV-loads. In a cohort of 203 consecutive renal transplantations performed from 2005-2008, 38 patients (19\%) developed BKV-viremia and were treated with reduction of immunosuppression. Based on subsequent allograft biopsy results and peak BKV-viremia, patients were assigned to three groups: (i) definitive PyVAN (n = 13), (ii) presumptive PyVAN defined by plasma BKV-loads of ≥ 4 log(10) copies/ml (n = 17) and (iii) low BKV-viremia (n = 8). Clearance of BKV-viremia was achieved in 35/38 patients (92\%) and subsequent clinical rejection occurred in 3/35 patients (8.6\%), both without any difference among the groups. Patients with definitive PyVAN had higher peak plasma BKV-loads and required longer time for clearance (8.8 vs. 4.6 vs. 2.9 months; p = 0.001). However, allograft function remained stable from baseline to last follow-up at 34 months (range 18-60) in all three groups with median serum creatinine of 1.6 mg/dl, 1.6 mg/dl and 1.3 mg/dl, respectively. We conclude that screening for BKV-replication and reduction of immunosuppression is an effective strategy to preserve medium-term allograft function even in patients developing definitive PyVAN. ©2010 The Authors Journal compilation©2010 The American Society of Transplantation and the American Society of Transplant Surgeons. This article was published in Am J Transplant and referenced in Journal of Addiction Research & Therapy

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