Tamoxifen co-administration during controlled ovarian hyperstimulation for in vitro fertilization in breast cancer patients increases the safety of fertility-preservation treatment strategies

Dror Meirow, Hila Raanani, Ettie Maman, Shani Paluch-Shimon, Moran Shapira, Yoram Cohen, Irena Kuchuk, Ariel Hourvitz, Jacob Levron, Michal Mozer-Mendel, Masha Brengauz, Hana Biderman, Daphna Manela, Rephael Catane, Jehoshua Dor, Raoul Orvieto, Bella Kaufman

Research output: Contribution to journalArticlepeer-review

Abstract

Objective To evaluate the safety and efficacy of tamoxifen co-administration during conventional controlled ovarian hyperstimulation (COH) protocols for a fertility-preservation IVF cycle in breast cancer patients. Design Two groups: retrospective descriptive cohort study and prospective study. Setting Breast cancer oncology and fertility-preservation centers in a tertiary hospital. Patient(s) Two groups of breast cancer patients: premenopausal patients treated with adjuvant tamoxifen; and patients undergoing in vitro fertilization (IVF) for fertility preservation. Intervention(s) Fertility-preservation cycles, tamoxifen co-administration during conventional IVF. Main Outcome Measure(s) Endocrine records, and IVF results. Result(s) Estradiol (E2) levels were chronically high (mean 2663 pmol/L, maximum: 10,000 pmol/L) in 38 of 46 breast cancer patients treated with adjuvant tamoxifen. Co-administration of tamoxifen (48 cycles) during conventional IVF or without tamoxifen (26 cycles), using either the long gonadotropin-releasing hormone-agonist or-antagonist protocols, resulted, respectively, in a mean of 12.65 and 10.2 oocytes retrieved, and 8.5 and 6.4 embryos cryopreserved. Average peak E2 levels were 6,924 pmol/L and 5,093 pmol/L, respectively, but long-term recurrence risk (up to 10 years) was not increased. Conclusion(s) In breast cancer patients, co-administration of tamoxifen during conventional COH for fertility preservation does not interfere with IVF results. The high serum E2 levels during COH should be considered safe, as it simulates the high prevalence of persistently high serum E2 levels in premenopausal breast cancer patients safely treated with adjuvant tamoxifen.

Original languageEnglish
Pages (from-to)488-495.e3
JournalFertility and Sterility
Volume102
Issue number2
DOIs
StatePublished - Aug 2014
Externally publishedYes

Keywords

  • IVF
  • breast cancer
  • controlled ovarian hyperstimulation
  • fertility preservation
  • tamoxifen

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