Nanofiltered C1 esterase inhibitor (human) for the treatment of acute attacks of hereditary angioedema: an open-label trial

Ann Allergy Asthma Immunol. 2012 Jan;108(1):49-53. doi: 10.1016/j.anai.2011.10.017. Epub 2011 Nov 21.


Background: Hereditary angioedema (HAE) is a rare disease caused by C1INH gene mutations, which leads to a deficiency or dysfunction of C1 inhibitor (C1 INH), resulting in recurrent episodes of severe and potentially life-threatening edema.

Objective: To evaluate the efficacy and safety of repeat use of nanofiltered C1 esterase inhibitor (human) (C1 INH-nf) for the short-term treatment of HAE attacks.

Methods: In this open-label study, patients received C1 INH-nf, 1,000 U intravenously, for the treatment of HAE attacks. Efficacy end points included the proportion of attacks with unequivocal relief of the defining symptom within 1 and 4 hours after receiving study drug and time to beginning of relief of the defining symptom. Safety was monitored through adverse event reporting, vital signs measurements, and laboratory testing.

Results: A total of 113 patients were enrolled in the study from September 21, 2006, through March 31, 2009, and received 885 doses of C1 INH-nf. A total of 609 HAE attacks were treated with C1 INH-nf, and the numbers of attacks achieving unequivocal relief of the defining symptom within 1 and 4 hours after the start of the first dose were 412 (68%) and 529 (87%), respectively. Of 101 patients treated for an attack during the study period, 80 achieved unequivocal relief of their first attack within 4 hours after study medication (response rate, 79%); median time to the beginning of unequivocal relief was 0.75 hour. C1 INH-nf was safe and well tolerated.

Conclusions: This open-label study demonstrates the efficacy and safety of C1 INH-nf for short-term treatment of HAE attacks.

Trial registration: Identifier: NCT00438815.

Publication types

  • Clinical Trial
  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acute Disease
  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Angioedemas, Hereditary / drug therapy*
  • Child
  • Child, Preschool
  • Complement C1 Inhibitor Protein / administration & dosage
  • Complement C1 Inhibitor Protein / adverse effects*
  • Complement C1 Inhibitor Protein / therapeutic use*
  • Complement Inactivating Agents / administration & dosage
  • Complement Inactivating Agents / adverse effects*
  • Complement Inactivating Agents / therapeutic use*
  • Female
  • Filtration / methods
  • Humans
  • Male
  • Middle Aged
  • Time Factors
  • Treatment Outcome
  • Young Adult


  • Complement C1 Inhibitor Protein
  • Complement Inactivating Agents

Associated data