title: Induction of spermatogenesis and fertility during gonadotropin treatment of gonadotropin-deficient infertile men: predictors of fertility outcome.
abstract: BACKGROUND
  The induction of spermatogenesis and fertility with gonadotropin therapy in gonadotropin-deficient men varies in rate and extent. Understanding the predictors of response would inform clinical practice but requires multivariate analyses in sufficiently large clinical cohorts that are suitably detailed and frequently assessed.
  
  
  METHODS
  A total of 75 men, with 72 desiring fertility, was treated at two academic andrology centers for a total of 116 courses of therapy from 1981-2008.
  
  
  RESULTS
  Semen analysis and testicular examination were performed every 3 months.
  
  
  RESULTS
  A total of 38 men became fathers, including five through assisted reproduction. The median time to achieve first sperm was 7.1 months [95% confidence interval (CI) 6.3-10.1]) and for conception was 28.2 months (95% CI 21.6-38.5). The median sperm concentration at conception for unassisted pregnancies was 8.0 m/ml (95% CI 0.2-59.5). Multivariate correlated time-to-event analyses show that larger testis volume, previous treatment with gonadotropins, and no previous androgen use each independently predicts faster induction of spermatogenesis and unassisted pregnancy.
  
  
  CONCLUSIONS
  Larger testis volume is a useful prognostic indicator of response. The association of slower responses after prior androgen therapy suggests that faster pregnancy rates might be achieved by substituting gonadotropin for androgen therapy for pubertal induction, although a prospective randomized trial will be required to prove this.
authors.affiliation: Department of Andrology, Concord Hospital and ANZAC Research Institute, University of Sydney, Sydney, New South Wales 2139, Australia. pliu@mail.usyd.edu.au
authors.forename: Peter Y
authors.initials: PY
authors.lastname: Liu
authors.forename: H W Gordon
authors.initials: HW
authors.lastname: Baker
authors.forename: Veena
authors.initials: V
authors.lastname: Jayadev
authors.forename: Margaret
authors.initials: M
authors.lastname: Zacharin
authors.forename: Ann J
authors.initials: AJ
authors.lastname: Conway
authors.forename: David J
authors.initials: DJ
authors.lastname: Handelsman
mesh_terms: D000328:Adult; D005307:Fertilization in Vitro; D006062:Gonadotropins / Q000172:deficiency* / Q000627:therapeutic use*; D006801:Humans; D007248:Infertility, Male / Q000188:drug therapy* / Q000503:physiopathology; D016015:Logistic Models; D008297:Male; D015999:Multivariate Analysis; D018401:Sample Size; D013091:Spermatogenesis / Q000187:drug effects*; D016896:Treatment Outcome
chemical_list: D006062:Gonadotropins