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The risk of polyomavirus BK-associated hemorrhagic cystitis after allogeneic hematopoietic SCT is associated with myeloablative conditioning, CMV viremia and severe acute GVHD.

Hemorrhagic cystitis (HC) is a common complication after allogeneic hematopoietic SCT (allo-HSCT). Several risk factors have been suggested including BU-containing myeloablative conditioning, unrelated donors and GVHD, but these have not been consistently reported. We conducted a retrospective study including 339 allo-HSCT recipients between 2009 and 2012. Of 339 patients, 79 (23.3%) developed HC with 2-year cumulative incidence of 24.0% (95% confidence interval, 19.4-28.9). The median onset time was 45 days (range, 16-430) after allo-HSCT. Sixty-two patients (84%) out of 74 evaluated for urine BK virus PCR testing showed a positive result (mean 2.0 × 10(10) copies of DNA per mL). In univariate analysis, myeloablative conditioning, HLA-mismatched donor, CMV viremia and acute GVHD (aGVHD) grade 3-4 were significantly associated with the risk of HC. Multivariate analysis confirmed all associating factors identified in univariate analysis except for HLA-mismatched donor: myeloablative conditioning (hazard ratio (HR) 2.63, P=0.003), CMV viremia (HR 1.88, P=0.014) and aGVHD grade 3-4 (HR 1.71, P=0.029). HC did not affect OS or non-relapse mortality. Symptomatic HC is a frequent complication following allo-HSCT, with a 2-year cumulative incidence of 24.0%. Three clinical factors associated with HC were identified including myeloablative conditioning, CMV viremia and severe aGVHD.

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