Letrozole reduces estrogen and gonadotropin exposure in women with breast cancer undergoing ovarian stimulation before chemotherapy

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dc.contributor.authorOktay Kutluk
dc.contributor.authorHourvitz Ariel
dc.contributor.authorŞahin Gülnaz
dc.contributor.authorÖktem Özgür
dc.contributor.authorSafro Bradley
dc.contributor.authorÇil Aylin
dc.contributor.authorBang Heejung
dc.date.accessioned2020-06-25T15:13:47Z
dc.date.available2020-06-25T15:13:47Z
dc.date.issued2006
dc.departmentKırıkkale Üniversitesi
dc.description.abstractContext: Women with breast cancer are not typically offered embryo or oocyte cryopreservation to preserve their fertility before chemotherapy because of the potential risks associated with high estrogen levels arising from ovarian stimulation. Objective: We aimed to determine whether the combination of an aromatase inhibitor with gonadotropin treatment in breast cancer patients produces comparable results to standard in vitro fertilization (IVF), without a significant increase in estradiol levels and delay in the initiation of chemotherapy. Patients and Methods: Stages I-IIIA breast cancer patients (n = 47) received 5 mg/d letrozole and 150-300 IU FSH to cryopreserve embryos or oocytes. Age-matched retrospective controls (n = 56) were selected from women who underwent IVF for tubal disease. Results: Whereas letrozole and FSH stimulation resulted in significantly lower peak estradiol levels (mean ± SD 483.4 ± 278.9 vs. 1464.6 ± 644.9 pg/ml; P < 0.001) and 44% reduction in gonadotropin requirement, compared with controls, the length of stimulation, number of embryos obtained, and fertilization rates were similar. The human chorionic gonadotropin administration criteria had to be adjusted to 20 mm after letrozole stimulation, compared with 17-18 mm in the controls. The mean delay from surgery to cryopreservation was 38.6 d, with 81% of all patients completing their IVF cycles within 8 wk of surgery. Conclusion: Ovarian stimulation with letrozole and FSH appears to be a cost-effective alternative for fertility preservation in breast cancer patients with reduced estrogen exposure, compared with standard IVF. If patients are referred promptly, they may undergo embryo or oocyte cryopreservation without a delay in chemotherapy. Copyright © 2006 by The Endocrine Society.en_US
dc.identifier.citationclosedAccessen_US
dc.identifier.doi10.1210/jc.2006-0962
dc.identifier.endpage3890en_US
dc.identifier.issn0021972X
dc.identifier.issue10en_US
dc.identifier.pmid16882752
dc.identifier.scopus2-s2.0-33749556041
dc.identifier.scopusqualityQ1
dc.identifier.startpage3885en_US
dc.identifier.urihttps://doi.org/10.1210/jc.2006-0962
dc.identifier.urihttps://hdl.handle.net/20.500.12587/1929
dc.identifier.volume91en_US
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherEndocrine Societyen_US
dc.relation.ispartofJournal of Clinical Endocrinology and Metabolism
dc.relation.publicationcategoryMakale - Ulusal Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.titleLetrozole reduces estrogen and gonadotropin exposure in women with breast cancer undergoing ovarian stimulation before chemotherapyen_US
dc.typeArticle

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