title: Clinical update on 10 children treated with intralesional cidofovir injections for severe recurrent respiratory papillomatosis.
abstract: OBJECTIVE
  To continue assessment of the benefits and risks of intralesional administration of cidofovir, an acyclic nucleoside phosphonate, for treating severe recurrent respiratory papillomatosis (RRP) in pediatric patients, and to discuss guidelines for larger prospective multi-institutional studies of the use of cidofovir.
  
  
  METHODS
  Prospective case series.
  
  
  METHODS
  Tertiary care children's hospital.
  
  
  METHODS
  A total of 10 patients with severe RRP (defined as requiring debulking procedures to maintain airway patency at least once a month) underwent intralesional cidofovir therapy. The original 5 patients have received more than 1 year of follow-up since their last cidofovir injection, and 5 subsequent patients have been treated with a revised injection protocol.
  
  
  METHODS
  Microsuspension laryngoscopy with intralesional injection of cidofovir after repetitive carbon dioxide laser treatments and mechanical debulking of papillomas.
  
  
  METHODS
  Papilloma stage at the time of serial laryngoscopies. Histologic examination of biopsy specimens of laryngeal tissue obtained 1 year or more after last cidofovir injection.
  
  
  RESULTS
  There was evidence of marked improvement in the 4 of the 5 new patients enrolled under the revised injection protocol, continuation of a disease-free state in 1 of the original 5 patients, and sustained improvement in 4 of the 5 original patients, resulting in a significantly reduced interval of intervention.
  
  
  CONCLUSIONS
  Intralesional cidofovir therapy continues to show benefit in the treatment of severe RRP in pediatric patients. Safety profiles have not been fully established, but current histologic data are reassuring.
authors.affiliation: Department of Pediatric Otolaryngology, Children's Hospital, San Diego, Calif, USA.
authors.forename: S M
authors.initials: SM
authors.lastname: Pransky
authors.forename: D F
authors.initials: DF
authors.lastname: Brewster
authors.forename: A E
authors.initials: AE
authors.lastname: Magit
authors.forename: D B
authors.initials: DB
authors.lastname: Kearns
mesh_terms: D000998:Antiviral Agents / Q000008:administration & dosage*; D002648:Child; D002675:Child, Preschool; D000077404:Cidofovir; D003596:Cytosine / Q000008:administration & dosage / Q000031:analogs & derivatives*; D005260:Female; D006801:Humans; D015552:Injections, Intralesional; D008297:Male; D009364:Neoplasm Recurrence, Local; D063065:Organophosphonates; D009943:Organophosphorus Compounds / Q000008:administration & dosage*; D010212:Papilloma / Q000188:drug therapy*; D011446:Prospective Studies; D012142:Respiratory Tract Neoplasms / Q000188:drug therapy*; D016896:Treatment Outcome
chemical_list: D000998:Antiviral Agents; D063065:Organophosphonates; D009943:Organophosphorus Compounds; D003596:Cytosine; D000077404:Cidofovir