Effect of rescuing donated immature human oocytes derived after FSH/hCG stimulation following in vitro culture with or without Follicular Fluid Meiosis Activating Sterol (FF-MAS)—an embryo chromosomal and morphological analysis

  • Kersti Lundin
  • Søren Ziebe
  • Christina Bergh
  • Anne Loft
  • Ulrika Selleskog
  • Lars Nilsson
  • Christian Grøndahl
  • Joan-Carles Arce for the CEMAS I Study Group


Purpose: Studies in mice and humans have shown that Follicular Fluid – Meiosis Activating Sterol (FF-MAS) induces meiotic maturation of immature oocytes in vitro. A multicenter, prospectively randomised study evaluated chromosomal status of embryos from FSH/hCG primed human immature oocytes, cultured with or without FF-MAS.

Methods: Denuded immature oocytes (n=365) were randomly allocated into inert control, FF-MAS 5 μM or 20 μM. Seventy ±2 hours after ICSI on matured oocytes, all cleaved embryos were fixed for fluorescence in situ hybridisation analysis.

Results: Only 15% of oocytes resulted in cleaved embryos. GV oocytes matured at significantly lower rates (14% and 7%) in the two FF-MAS groups compared to the inert control group (47%). High rates of chromosomal abnormalities were found in all groups.

Conclusion: Immature oocytes showed poor development with high rates of embryo chromosomal abnormalities. Exposure to FF-MAS in the concentrations, duration and/or formulation used in this study did not improve the results.


Immature oocytes FF-MAS Human Aneuploidy In vitro fertilisation 



We would like to thank the staff at the IVF units at Sahlgrenska University Hospital, Rigshospitalet, Carlanderska Hospital as well as Quintiles AB and Quest Diagnostics for great support. At Novo Nordisk we received generous help from Lisbeth Helmgaard, Søren Larsen, Hansoo Kim and Lars Müller.


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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Kersti Lundin
    • 1
  • Søren Ziebe
    • 2
  • Christina Bergh
    • 1
  • Anne Loft
    • 2
  • Ulrika Selleskog
    • 3
  • Lars Nilsson
    • 1
  • Christian Grøndahl
    • 4
  • Joan-Carles Arce for the CEMAS I Study Group
    • 4
  1. 1.Department of Obstetrics and GynecologyReproductive Medicine, Sahlgrenska University HospitalGöteborgSweden
  2. 2.The Fertility Clinic, Rigshospitalet, section 4071Copenhagen University HospitalCopenhagenDenmark
  3. 3.Fertility CenterCarlanderska HospitalGöteborgSweden
  4. 4.Research & DevelopmentNovo Nordisk A/SCopenhagenDenmark

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