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  • Title: Blood, and not urine, BK viral load predicts renal outcome in children with hemorrhagic cystitis following hematopoietic stem cell transplantation.
    Author: Haines HL, Laskin BL, Goebel J, Davies SM, Yin HJ, Lawrence J, Mehta PA, Bleesing JJ, Filipovich AH, Marsh RA, Jodele S.
    Journal: Biol Blood Marrow Transplant; 2011 Oct; 17(10):1512-9. PubMed ID: 21385622.
    Abstract:
    BK virus is a significant cause of hemorrhagic cystitis after hematopoietic stem cell transplantation (HSCT). However, its role in nephropathy post-HSCT is less studied. We retrospectively evaluated clinical outcomes in pediatric HSCT patients with hemorrhagic cystitis. Although most of these patients had very high urine BK viral loads (viruria), patients with higher BK plasma loads (viremia) had significant renal dysfunction, a worse clinical course, and decreased survival. Patients with a peak plasma BK viral load of >10,000 copies/mL (high viremia) were more likely to need dialysis and aggressive treatment for hemorrhagic cystitis compared to patients with ≤ 10,000 copies/mL (low viremia). Conversely, most patients with low viremia had only transient elevations in creatinine, and less severe hemorrhagic cystitis that resolved with supportive therapy. Overall survival (OS) at 1 year post-HSCT was 89% in the low viremia group and 48% in the high viremia group. We conclude that the degree of BK viremia, and not viruria, may predict renal, urologic, and overall outcome in the post-HSCT population.
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