Fertility Preservation Using Tamoxifen and Letrozole in Estrogen Sensitive Tumors Trial

Recruiting now · Phase 3

Conditions studied: Infertility

In brief

Latrogenic infertility as a result of cancer treatment has a profound effect on long-term quality of life in survivors of reproductive-age cancers. Oocyte cryopreservation prior to cancer treatment has been associated with improved quality of life, with a potential ability to reduce long-term decision-related regret in cancer survivors. Though letrozole plus gonadotropin and and tamoxifen plus gonadotropin are currently routinely used worldwide in ovarian stimulation cycles for fertility preservation in patients with estrogen-receptor-positive breast cancer, it is not clear which of the two might lead to improved oocyte yield. Improved knowledge about the efficacy of these medications, with regard to oocyte yield, has the potential to significantly improve quality of life in reproductive-age breast cancer survivors.

Key facts

Study ID

NCT03011684

Run by

University of California, San Francisco

People needed

309

Starts

2016-07-21

Expected to finish

2028-03-31

Last updated by the study team

2026-06-04

Who can join

Age: 18 and older, up to 50. Sex: female. Healthy volunteers: not accepted.

You may qualify if…

• New breast cancer diagnosis
• Has not yet begun chemotherapy
• Desires to undergo ovarian stimulation and oocyte retrieval prior to cancer treatment
• Age 18 years old or greater

You may not qualify if…

• Chemotherapy has already commenced or been completed
• History of recurrent breast cancer (with a prior history of chemotherapy)
• Stage IV breast cancer diagnosis (metastases remote from the breast)
• Patient's oncologist advises against the trial - in which case they can choose to receive stimulation with letrozole+gonadotropin
• Does not plan to undergo ovarian stimulation and oocyte retrieval prior to diagnosis
• Any significant concurrent disease, illness, or psychiatric disorder that would compromise patient safety or compliance, interfere with consent, study participation, follow-up, or interpretation of study results
• Age less than 18 years old

Where it is running

• University of California at San Francisco — San Francisco, California, United States (enrolling)

Full record on ClinicalTrials.gov

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