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Serum Estradiol Levels In Postmenopausal Women With Breast Cancer Receiving Adjuvant Aromatase Inhibitors and Vaginal Estrogen

NCT00984399 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 31

Last updated 2025-12-09

Study results available
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Summary

The purpose of this study is to see if Vagifem® 10mcg is safe for women who have had breast cancer. Vagifem is an estrogen product. It is a tiny tablet that is inserted into the vagina. It relieves vaginal dryness. Women who have had breast cancer are usually told not to take estrogen. This is because estrogen use can lead to a breast cancer recurrence or a new primary breast cancer. It is unclear if the estrogen in Vagifem is only absorbed in the vagina. It may be absorbed into the blood stream for a short time and may cause a brief rise in your estrogen level. However, there is no clear evidence that this would cause any bad effects in patients with breast cancer. How much, if any, of these topical estrogens are absorbed through the vagina is not known. We also do not know what the impact is of low dose estrogen absorption on breast cancer outcomes. Also, the absorption should decrease as the mucus membranes are restored after estrogen exposure.

Conditions

Interventions

DRUG

Vagifem® (vaginal 17β-estradiol) questionnaire & menopause symptom checklist

The goal is to have 30 patients on letrozole and 30 on anastrozole who are initiated on vaginal estrogen for symptoms of urogenital atrophy. All subjects will receive 10mcg vaginal 17-β estradiol tablets. Each subject will serve as her own control. We will monitor serum estradiol and follicle stimulating hormone (FSH) levels closely from 0-24 weeks. We will measure serum estradiol and FSH levels at baseline, and subsequently at weeks 2, 7, 12, 18 and 24 after commencing therapy with 10mcg vaginal 17-β estradiol.

Sponsors & Collaborators

Principal Investigators

  • Shari Goldfarb, MD · Memorial Sloan Kettering Cancer Center

Study Design

Allocation
NA
Purpose
TREATMENT
Masking
DOUBLE
Model
PARALLEL

Eligibility

Min Age
18 Years
Sex
FEMALE
Healthy Volunteers
No

Timeline & Regulatory

Start
2009-09-22
Primary Completion
2024-05-13
Completion
2024-05-13

Countries

  • United States

Study Locations

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Diseases
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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT00984399 on ClinicalTrials.gov