Drug Withdrawal in Women With Progressive Breast Cancer While on Aromatase Inhibitor Therapy
Public ClinicalTrials.gov record NCT00916162. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
A Phase II Clinical Trial of Drug Withdrawal in Women With Progressive Breast Cancer While on Aromatase Inhibitor Therapy
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
The purpose of this research study is to study the effects of stopping aromatase inhibitory (AI) therapy on breast cancer progression. Aromatase inhibitors are a class of drugs used to treat breast cancer in postmenopausal women. They work by decreasing the level of estrogen, which is believed to stimulate the growth of tumor tissue. Breast cancer that progresses despite therapy with an AI is thought to have been resistant to AI therapy. There is scientific evidence to suggest that resistant breast cancer cells learn to grow at the very low levels of estrogen present on AI therapy and that increasing estrogen levels even slightly by stopping AI therapy with inhibit the breast cancer cells. An improvement or stabilization of breast cancer has been observed after stopping therapy with tamoxifen, a different anti-estrogen therapy, and has been reported in the literature after stopping AI therapy. This research study will be the first study to formally test the rate of disease improvement (response) or stabilization after stopping AI therapy.
Study identification
- NCT ID
- NCT00916162
- Recruitment status
- Completed
- Study type
- Observational
- Phase
- Not listed
- Enrollment
- 24 participants
Conditions and interventions
Conditions
Interventions
Not listed
Eligibility (public fields only)
- Age range
- 35 Years and older
- Sex
- Female
- Healthy volunteers
- Healthy volunteers not accepted
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Jul 31, 2006
- Primary completion
- Dec 31, 2009
- Completion
- Dec 31, 2009
- Last update posted
- May 7, 2013
2006 – 2010
United States locations
- U.S. sites
- 3
- U.S. states
- 1
- U.S. cities
- 1
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Massachusetts General Hospital | Boston | Massachusetts | 02114 | — |
| Beth Israel Deaconess Medical Center | Boston | Massachusetts | 02115 | — |
| Dana-Farber Cancer Institute | Boston | Massachusetts | 02115 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT00916162, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted May 7, 2013 · Synced Sep 22, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT00916162 live on ClinicalTrials.gov.