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Spots Global Cancer Trial Database for Effectiveness of Zoledronic Acid in the Prevention of Osteoporosis in Early Breast Cancer Patients Receiving Letrozole

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Trial Identification

Brief Title: Effectiveness of Zoledronic Acid in the Prevention of Osteoporosis in Early Breast Cancer Patients Receiving Letrozole

Official Title: Phase 3 Study of the Effect of Zoledronic Acid in the Prevention of Osteoporosis in Early Breast Cancer Patients Receiving the Aromatase Inhibitor, Letrozole, in the Adjuvant Setting

Study ID: NCT00376740

Conditions

Breast Cancer

Interventions

zoledronic acid

Study Description

Brief Summary: The purpose of this study is to determine whether zoledronic acid given intravenously every 6 months can prevent reduction in bone mineral density in women with early stage breast cancer receiving adjuvant therapy with the aromatase inhibitor drug letrozole, after having received adjuvant tamoxifen.

Detailed Description: Letrozole is an aromatase inhibitor used in the treatment of hormone receptor positive metastatic breast cancer in postmenopausal women.It has more recently been approved for use in many countries as adjuvant therapy for early breast cancer; and is often used in an adjuvant regimen following 2-3 years of tamoxifen treatment or as an extended adjuvant therapy after up to 5 years of tamoxifen. Letrozole inhibits the conversion of androgens to estrogens in vitro and in vivo. Plasma levels of estradiol and related estrogen compounds in postmenopausal patients receiving letrozole are suppressed up to 95% from baseline and are often undetectable.The estrogen deprivation in women receiving letrozole may cause increased bone resorption and bone loss.Studies comparing tamoxifen and aromatase inhibitors, in adjuvant therapy have shown an increase fracture rate, and decreased bone mineral density in patients receiving aromatase inhibitors. Zoledronic acid is an intravenously administered bisphosphonate that inhibits osteoclastic bone resorption. Intravenous bisphosphonates are effective in reducing the rate of skeletal complications, including fractures, in patients with metastatic breast cancer and other tumors when given every few weeks. Small clinical trials have given some evidence that osteoporosis can be effectively treated by one or two doses of intravenous zoledronic acid per year. This study will determine the effect of giving zoledronic acid every 6 months on the bone mineral density of patients receiving letrozole as adjuvant therapy for early breast cancer after having received adjuvant tamoxifen for at least 2.5 years. Patients will be randomized to receive zoledronic acid either at the start of letrozole therapy or when bone mineral density T score drops below - 2 standard deviation or at the occurrence of a non-trauma related fracture.

Eligibility

Minimum Age: 18 Years

Eligible Ages: ADULT, OLDER_ADULT

Sex: FEMALE

Healthy Volunteers: No

Locations

Soroka University Medical Center, Beer Sheva, , Israel

Tel Aviv Sourasky Medical Center, Tel Aviv, , Israel

Contact Details

Name: Tamar Safra, M.D.

Affiliation: Tel-Aviv Sourasky Medical Center

Role: STUDY_CHAIR

Useful links and downloads for this trial

Clinicaltrials.gov

Google Search Results

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