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Clinical trialNCT00066690CompletedPhase 3Interventional

Suppression of Ovarian Function With Either Tamoxifen or Exemestane Compared With Tamoxifen Alone in Treating Premenopausal Women With Hormone-Responsive Breast Cancer

SponsorETOP IBCSG Partners FoundationEnrollment3,066Estrogen Receptor Positive Breast CancerProgesterone Receptor Positive TumorRecurrent Breast CarcinomaStage IA Breast CancerStage IB Breast CancerStage IIA Breast Cancer+2 more conditions
View the registry record on ClinicalTrials.gov

Summary

The registered summary isn't in our current data snapshot. Read it on the ClinicalTrials.gov record ↗. Why? →

Investigators

The overall officials registered on this study. Names that resolve to a findmyKOL profile link to it; the rest are shown as registered.

A profile link is shown only when the registered name resolves to a person record with a confident, namesake-checked match; ambiguous names stay unlinked.

Sites

500 registered facilities, with the per-site recruitment status where the registry publishes one. ClinicalTrials.gov does not publish per-site enrollment counts.

Canada
  • Tom Baker Cancer Centre

    Calgary, Alberta, Canada

  • Cross Cancer Institute

    Edmonton, Alberta, Canada

  • Bcca-Cancer Centre for the Southern Interior

    Kelowna, British Columbia, Canada

  • Penticton Regional Hospital

    Penticton, British Columbia, Canada

  • Bcca-Fraser Valley Cancer Centre

    Surrey, British Columbia, Canada

  • Bcca-Vancouver Cancer Centre

    Vancouver, British Columbia, Canada

  • Cancercare Manitoba

    Winnipeg, Manitoba, Canada

  • Doctor H. Bliss Murphy Cancer Centre

    St. John's, Newfoundland and Labrador, Canada

  • Health Sciences North

    Greater Sudbury, Ontario, Canada

  • Juravinski Cancer Centre at Hamilton Health Sciences

    Hamilton, Ontario, Canada

  • Cancer Centre of Southeastern Ontario at Kingston General Hospital

    Kingston, Ontario, Canada

  • London Regional Cancer Program

    London, Ontario, Canada

  • Ottawa Hospital and Cancer Center-General Campus

    Ottawa, Ontario, Canada

  • Thunder Bay Regional Health Science Centre

    Thunder Bay, Ontario, Canada

  • Odette Cancer Centre- Sunnybrook Health Sciences Centre

    Toronto, Ontario, Canada

  • Csss Champlain-Charles Le Moyne

    Greenfield Park, Quebec, Canada

  • Chum-Hotel Dieu Du Montreal

    Montreal, Quebec, Canada

  • Hopital Du Sacre-Coeur de Montreal

    Montreal, Quebec, Canada

  • Allan Blair Cancer Centre

    Regina, Saskatchewan, Canada

Switzerland
  • International Breast Cancer Study Group

    Bern, Switzerland

United States
  • University of Alabama at Birmingham Cancer Center

    Birmingham, Alabama, United States

  • Providence Alaska Medical Center

    Anchorage, Alaska, United States

  • Mayo Clinic in Arizona

    Scottsdale, Arizona, United States

  • Alta Bates Summit Medical Center-Herrick Campus

    Berkeley, California, United States

  • Mills - Peninsula Hospitals

    Burlingame, California, United States

  • East Bay Radiation Oncology Center

    Castro Valley, California, United States

  • Valley Medical Oncology Consultants-Castro Valley

    Castro Valley, California, United States

  • John Muir Medical Center-Concord Campus

    Concord, California, United States

  • Bay Area Breast Surgeons Inc

    Emeryville, California, United States

  • Kaiser Permanente-Fremont

    Fremont, California, United States

  • Valley Medical Oncology Consultants-Fremont

    Fremont, California, United States

  • Glendale Memorial Hospital and Health Center

    Glendale, California, United States

  • Marin General Hospital

    Greenbrae, California, United States

  • Scripps Cancer Center

    La Jolla, California, United States

  • Ucla / Jonsson Comprehensive Cancer Center

    Los Angeles, California, United States

  • Usc / Norris Comprehensive Cancer Center

    Los Angeles, California, United States

  • Contra Costa Regional Medical Center

    Martinez, California, United States

  • Memorial Medical Center

    Modesto, California, United States

  • Palo Alto Medical Foundation-Camino Division

    Mountain View, California, United States

  • Sutter Cancer Research Consortium

    Novato, California, United States

460 more sites on the registry record.ClinicalTrials.gov ↗

Site investigator names are published by ClinicalTrials.gov only while a study recruits, so completed studies list sites without them.

Drugs studied

No drug or biological interventions are in our data for this study — it may test a procedure, device or behavioral intervention, or the intervention list isn't in our current snapshot. See the registry record ↗. Why? →

Registration & key dates

Registry attributes as recorded on the ClinicalTrials.gov study record.

Start
17 Dec 2003
Primary completion
31 May 2014
Completion
6 Nov 2024
Last update posted
6 Feb 2026
Registered enrollment
3,066
Registry id
NCT00066690

Cross-registrations

EU-CTR / CTIS (EudraCT)2004-000166-13

Source: ClinicalTrials.gov, via the CTTI AACT database, data as of 12 Jul 2026. Registry facts are shown as registered by the study sponsor; findmyKOL does not interpret them.