title: The role of Human papilloma virus (HPV) genotyping in recurrent respiratory papillomatosis in Rasoul Akram Hospital.
abstract: BACKGROUND
  The most common laryngeal mass in children is recurrent respiratory papillomatosis (RRP). Studies have attempted to correlate viral typing and its aggressiveness.
  
  
  METHODS
  29 patients with histologically confirmed RRP enrolled in adjuvant therapies. Patients underwent several surgical interventions.
  
  
  RESULTS
  HPV genotyping demonstrated 45% HPV-6 and 55% HPV-11. The mean age at the first surgical intervention was 52.39 months (SD=102.28) (range from 4 months to 426 months). The mean number of surgical intervention was 10.39 (SD=7.76) (range from 2 to 30). The mean time of surgical intervals was 4.63 months (SD=4.02) (range from 2 to 24 months). In fourteen patients (48%) tracheotomy was done. All patients who had tracheotomy received alpha-interferon. One of our cases was a male who had pulmonary extension with HPV-6.
  
  
  CONCLUSIONS
  A review of patients with RRP was regarding to HPV genotyping and need for adjuvant therapy and tracheostomy. Mean number of surgical procedure was 10/40 and nearly fourteen patients (48%) need to tracheotomy. The clinical differences between HPV6 and HPV11 disease may not be accurately predictable. Patients with less age and with HPV-11 seemed to have more severe problems, but these differences were not statistically significant which needs much more investigations for reasonable starting point of evaluation for these differences.
authors.affiliation: MD, Associated professor of Otolaryngolgy-Head and Neck Surgery, Department of Otolaryngology, ENT.HNS research center, Tehran University of Medical Sciences, Tehran, Iran. izadimd@yahoo.com.
authors.forename: Farzad
authors.initials: F
authors.lastname: Izadi
authors.forename: Rasool
authors.initials: R
authors.lastname: Hamkar
authors.forename: Hadi
authors.initials: H
authors.lastname: Ghanbari
authors.forename: Fereshteh
authors.initials: F
authors.lastname: Abdolmotallebi
authors.forename: Hesam
authors.initials: H
authors.lastname: Jahandideh
keywords: Human papillomavirus; Laryngeal neoplasms; Papillomatosis; Respiratory tract diseases