Timing day-3 vitrification for PGT-M embryos: pre- or post-blastomere biopsy?

Adva Aizer, Chen Shimon, Olga Dratviman-Storobinsky, Hagit Shani, Noa Harel Inbar, Ettie Maman, Raoul Orvieto

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: To assess the efficacy and clinical outcomes of preimplantation genetic testing for monogenic diseases (PGT-M), following blastomere biopsy prior or following vitrification. Methods: A cohort-historical study of all consecutive patients admitted to IVF in a large tertiary center for PGT-M and PCR cycle from September 2016 to March 2020. Patients were divided into 4 groups: Group A1 consisted of patients undergoing day-3 embryos biopsy followed by a fresh transfer of unaffected embryos. Group A2 consisted of Group A1 patients that their surplus unaffected embryos were vitrified, thawed, and transferred in a subsequent FET cycle. Group B1 consisted of patients that their day-3 embryos were vitrified intact (without biopsy) for a subsequent FET cycle. Later embryos were thawed and underwent blastomere biopsies, and the unaffected embryos were transferred, while the surplus unaffected embryos were re-vitrified for a subsequent FET cycle. Group B2 consisted of Group B1 patients that their surplus unaffected embryos were re-vitrified, thawed, and transferred in a subsequent FET cycle. The laboratory data and clinical results were collected and compared between groups. Results: A total of 368 patients underwent 529 PGT-M cycles in our center: 347 with day-3 embryos biopsied before undergoing vitrification (Group A1) and 182 following vitrification and thawing (Group B1). There were no between group differences in embryo survival rate post-thawing, nor the ongoing implantation and pregnancy rates. Conclusion: In PGT-M cycles, the timing of embryos vitrification, whether prior or following blastomere biopsy, has no detrimental effect on post-thawing embryo survival rate, nor their potential ongoing implantation and pregnancy rates.

Original languageEnglish
Pages (from-to)2413-2418
Number of pages6
JournalJournal of Assisted Reproduction and Genetics
Volume37
Issue number10
DOIs
StatePublished - 1 Oct 2020
Externally publishedYes

Keywords

  • Blastomere biopsy
  • Day-3 biopsy
  • PGT-M
  • Pregnancy rate
  • Preimplantation genetic testing
  • Vitrification

ASJC Scopus subject areas

  • Reproductive Medicine
  • Genetics
  • Obstetrics and Gynecology
  • Developmental Biology
  • Genetics(clinical)

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