نبذة مختصرة : Although hemorrhagic cystitis (HC) is a common complication of allogeneic hematopoietic cell transplantation (alloHCT), its risk factors and effects on survival are not well-known. We evaluated HC in a large cohort (n=1321, 2003 – 2012) receiving alloHCT from all graft sources, including umbilical cord blood (UCB). We compared HC patients with non-HC (control) patients and examined clinical variables at HC onset and resolution. Of these 1321 patients, 219 (16.6%) developed HC at a median of 22 days after alloHCT. BK viruria was detected in 90% of 109 tested HC patients. Median duration of HC was 27 days. At the time of HC diagnosis, acute graft-versus-host disease (GVHD), fever, severe thrombocytopenia, and steroid use were more frequent than at the time of HC resolution. In univariate analysis, male sex, age
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