title: Prognostic factors in oocyte donation: an analysis through egg-sharing recipient pairs showing a discordant outcome.
abstract: OBJECTIVE
  To analyze prognostic factors that are associated with a discordant outcome in egg recipients sharing oocytes from the same donor.
  
  
  METHODS
  Matched case-control single-center study.
  
  
  METHODS
  Private infertility clinic.
  
  
  METHODS
  Four hundred forty-four recipients (222 pairs) sharing oocytes from the same donor and showing a discordant outcome.
  
  
  METHODS
  Controlled ovarian hyperstimulation of egg donors, oocyte donation, intracytoplasmic sperm injection, and ET in egg recipients.
  
  
  METHODS
  Recipient age, obstetric (gravidity, parity) and gynecologic variables (previous uterine surgery, uterine fibroids, uterine malformations, endometriosis, history of tubal infertility), previous oocyte donation cycles, duration of E(2) replacement, received cumulus-oocyte complexes, mature (MII) oocytes, fertilized oocytes, transferred embryos, mean embryo score, transfer difficulty, and semen parameters.
  
  
  RESULTS
  No significant differences were found in the above-mentioned prognostic factors between the study and control groups.
  
  
  CONCLUSIONS
  Recipient- and cycle-related prognostic factors investigated in our study were not associated with a discordant outcome in recipient pairs sharing oocytes from the same donor. Other possible prognostic factors involving oocyte donor heterogeneity, embryo aneuploidy rates, male factor infertility, and endometrial receptivity should be further investigated.
authors.affiliation: Clínica EUGIN, Barcelona, Spain. dbodri@euvitro.com
authors.forename: Daniel
authors.initials: D
authors.lastname: Bodri
authors.forename: Marta
authors.initials: M
authors.lastname: Colodron
authors.forename: Ricard
authors.initials: R
authors.lastname: Vidal
authors.forename: Anna
authors.initials: A
authors.lastname: Galindo
authors.forename: Mercè
authors.initials: M
authors.lastname: Durban
authors.forename: Oriol
authors.initials: O
authors.lastname: Coll
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D020964:Embryo Loss / Q000175:diagnosis* / Q000209:etiology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D018587:Oocyte Donation; D009865:Oocytes / Q000637:transplantation; D011379:Prognosis; D012189:Retrospective Studies; D012307:Risk Factors; D014180:Transplantation; D016896:Treatment Outcome