title: Clinical outcome following stimulation with highly purified hMG or recombinant FSH in patients undergoing IVF: a randomized assessor-blind controlled trial.
abstract: BACKGROUND
  LH activity may influence treatment response and outcome in IVF cycles.
  
  
  METHODS
  A randomized, assessor-blind, multinational trial compared ongoing pregnancy rates (primary end-point) in 731 women undergoing IVF after stimulation with highly purified menotrophin (HP-hMG) (n = 363) or recombinant FSH (rFSH) (n = 368) following a long GnRH agonist protocol. Patients received identical pre- and post-randomization interventions. One or two embryos were transferred on day 3.
  
  
  RESULTS
  More oocytes were retrieved (P < 0.001) after rFSH treatment (11.8) compared with HP-hMG treatment (10.0), but a higher proportion developed into top-quality embryos (P = 0.044) with HP-hMG (11.3%) than with rFSH (9.0%). At the end of stimulation, lower estradiol (E(2)) (P = 0.031) and higher progesterone (P < 0.001) levels were found with rFSH, even after adjusting for follicular response. The distribution of hypo-, iso- and hyper-echogenic endometrium showed a significant (P = 0.023) shift towards the hyperechogenic pattern after rFSH treatment. The ongoing pregnancy rate per cycle was 27% with HP-hMG and 22% with rFSH [odds ratio (95% confidence interval): 1.25 (0.89-1.75)].
  
  
  CONCLUSIONS
  Superiority of HP-hMG over rFSH in ongoing pregnancy rate could not be concluded from this study, but non-inferiority was established. Pharmacodynamic differences in follicular development, oocyte/embryo quality, endocrine response and endometrial echogenicity exist between HP-hMG and rFSH preparations, which may be relevant for treatment outcome.
authors.affiliation: Rigshospitalet, Fertility Clinic, Copenhagen, Denmark. anders.nyboe.andersen@rh.hosp.dk
authors.forename: Anders Nyboe
authors.initials: AN
authors.lastname: Andersen
authors.forename: Paul
authors.initials: P
authors.lastname: Devroey
authors.forename: Joan-Carles
authors.initials: JC
authors.lastname: Arce
mesh_terms: D000328:Adult; D004624:Embryo Transfer; D005260:Female; D005307:Fertilization in Vitro; D005640:Follicle Stimulating Hormone / Q000627:therapeutic use*; D005500:Follow-Up Studies; D006801:Humans; D007247:Infertility, Female / Q000628:therapy*; D008596:Menotropins / Q000627:therapeutic use*; D018587:Oocyte Donation; D010062:Ovulation Induction; D011247:Pregnancy; D011256:Pregnancy Outcome; D018873:Pregnancy Rate; D011994:Recombinant Proteins / Q000627:therapeutic use; D016896:Treatment Outcome
chemical_list: D011994:Recombinant Proteins; D008596:Menotropins; D005640:Follicle Stimulating Hormone