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Completed

NCT Number: NCT00903162

Extended Endocrine Therapy for Premenopausal Women With Breast Cancer

The purpose of this study is to determine the safety and tolerability of the combination of two drugs (letrozole and leuprolide) in women who have already taken tamoxifen for at least 4.5 years. Letrozole, an aromatase inhibitor (which blocks an enzyme that produces estrogen), is a drug that is FDA approved. It has been shown to reduce the risk of breast cancer recurrence in postmenopausal women with breast cancer who have been previously treated with tamoxifen. Letrozole works by stopping the production of estrogen in parts of the body other than the ovaries. Leuprolide is a drug that stops a women's ovarian cycles. This process is known as ovarian function suppression. Stopping a women's menstrual cycle may be effective against breast cancer for some patients when given as initial therapy. The combination of letrozole and leuprolide is considered a standard treatment for women with metastatic breast cancer, and is also sometimes used for treatment of premenopausal early stage breast cancer, but it has not been accepted as a standard of care treatment.

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Key information

Conditions

Breast Cancer Breast Diseases Breast Neoplasms Neoplasms Neoplasms by Site Skin Diseases Skin and Connective Tissue Diseases

Age range

18 year and older

Sex eligibility

Female

Study type

Interventional

Phase

Phase 2

Primary location

University of Colorado, Denver, Colorado, United States

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About this study

  • Participants will be given a monthly intramuscular injection of leuprolide. Six to eight weeks after the first leuprolide injection, participants will be instructed to begin taking letrozole pills by mouth at home each day.
  • During this research study, participants will also be offered injections of zoledronic acid to preserve bone mineral density. If desire, these injections will be given every 6 months for a total of 4 injections during the course of the research study.
  • The treatments in this research study may increase the risk of bone density loss, so vitamin D and calcium supplements will be recommended to participants.
  • The following tests and procedures will be performed during the research study: Physical Exam (every visit); Blood tests; Urine test (beginning and end of treatment); Imaging (annual mammograms); Bone Density (DXA) Scan (beginning and end of treatment); Questionnaires (throughout the study).
  • Participants will be on this study for about two years.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Women 18 years of age or older
  • History of invasive ER+ or PR+ breast cancer treated with at least 4.5 years of tamoxifen
  • No current evidence of recurrent invasive disease or metastatic disease. Patients may have a history of bilateral breast cancer
  • Premenopausal (estradiol level in premenopausal range, >20pg/ml, within the prior 28 days)
  • Liver function tests and creatinine <2.5 times the upper limit of normal within the 28 days prior to enrollment
  • ECOG Performance Status 0-1
  • Must agree to use non-hormonal contraception (condoms, diaphragm, IUD, sterilization, abstinence, etc) and no other hormonal therapy during trial and until 3 months after letrozole is stopped
  • Negative pregnancy test within 14 days prior to enrollment
  • Patient must be able to speak, read and write in English

Exclusion criteria

  • Previous treatment with an oral or IV bisphosphonate in the prior two years
  • History of cancer other than breast cancer within 5 years excluding basal/squamous cell skin carcinoma in situ of the cervix
  • Women with evidence of current local recurrence or metastatic breast cancer
  • Pregnant women
  • Nursing women
  • Women who are currently taking tamoxifen and are unwilling to stop this medication
  • Women with a known deleterious BRCA 1 or BRCA 2 mutation

Treatment and study plan

Leuprolide

Drug

Given intramuscularly beginning on day 1 and then either 7.5 mg every month or 22.5 mg every 3 months for two years

Other names: Lupron

letrozole

Drug

Taken orally once a day 6-8 weeks after initial leuprolide administration

Other names: Femara

Zoledronic acid

Drug

If desired, given intravenously every 6 months for a total of 4 injections (optional)

Other names: Zometa

Primary outcomes

  1. Tolerability at One Year of Ovarian Function Suppression (OFS) Using Leuprolide and Letrozole.

    Time frame: 1 year

    The tolerability at one year of ovarian function suppression (OFS) using leuprolide and letrozole in this patient population. Specifically, the number of patients who discontinued treatment prior to one year due to toxicity.

Secondary outcomes

  1. Ovarian Function Suppression (OFS) Combined With Aromatase Inhibition Combined With Intravenous Bisphosphonate Therapy on Bone Mineral Density.

    Time frame: 2 years

    Ovarian function suppression (OFS) combined with aromatase inhibition combined with intravenous bisphosphonate therapy on bone mineral density in this patient population.

  2. The Effect of OFS Combined With Aromatase Inhibitor Therapy on the Incidence and Severity of Menopausal Symptoms, Sexual Dysfunction, Musculoskeletal Complaints, Other Side Effects and Overall Quality of Life.

    Time frame: 2 years

    OFS combined with aromatase inhibitor therapy on the incidence and severity of menopausal symptoms, sexual dysfunction, musculoskeletal complaints, other side effects and overall quality of life in this population.

Sponsors and collaborators

Lead sponsor

Dana-Farber Cancer Institute

Other

Collaborators

  • Beth Israel Deaconess Medical Center
  • Novartis

Registry information

Important dates

Study start
2009
Primary completion
2014
Study completion
2014
First posted
May 18, 2009
Registry last updated
Apr 18, 2016

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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