title: Eculizumab Dosing Intervals Longer than 17 Days May Be Associated with Greater Risk of Breakthrough Hemolysis in Patients with Paroxysmal Nocturnal Hemoglobinuria.
abstract: Eculizumab given bi-weekly is widely recommended for the treatment of paroxysmal nocturnal hemoglobinuria (PNH). We undertook a retrospective analysis on the medical records of 763 dosings of 14 PNH patients to investigate whether a threshold would exist in dosing intervals associated with breakthrough hemolysis. We identified 12 events of breakthrough hemolysis in 4 patients. Multivariate logistic regression and receiver operating characteristics (ROC) analysis revealed a significant association between increased risk of breakthrough hemolysis and prolonged dosing intervals of 17 days or more and concomitant inflammation: odds ratios (OR) and 95% confidence intervals (CIs) were 1.6 (1.3-2.0, p<0.01) and 5.5 (1.3-22.8, p=0.02), respectively. ROC analysis showed that the best cut-off dosing interval discriminating breakthrough hemolysis was 16.5 days. We consider that eculizumab dosing intervals longer than 17 days may be associated with an increased risk for developing breakthrough hemolysis in patients with PNH.
authors.affiliation: Department of Pharmacy, NTT Medical Center Tokyo.
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Nakayama
authors.forename: Kensuke
authors.initials: K
authors.lastname: Usuki
authors.forename: Hirotoshi
authors.initials: H
authors.lastname: Echizen
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Ogawa
authors.forename: Takao
authors.initials: T
authors.lastname: Orii
mesh_terms: D000328:Adult; D000368:Aged; D061067:Antibodies, Monoclonal, Humanized / Q000008:administration & dosage* / Q000627:therapeutic use*; D004334:Drug Administration Schedule; D005260:Female; D006457:Hemoglobinuria, Paroxysmal / Q000150:complications / Q000188:drug therapy*; D006461:Hemolysis; D006801:Humans; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D012189:Retrospective Studies; D012307:Risk Factors; D055815:Young Adult
chemical_list: D061067:Antibodies, Monoclonal, Humanized; C481642:eculizumab