Official Title: “A Randomised, Double-Blind Trial to Assess the Effects on Bone Mineral Density and Bone Biomarkers of Anastrozole When Used to Prevent Breast Cancer in Postmenopausal Women”

RATIONALE: Bisphosphonates, such as risedronate, may help improve bone health and prevent osteoporosis in postmenopausal women. It is not yet known whether risedronate is effective in improving bone mineral density and bone health in women with ductal carcinoma in situ.

PURPOSE: This randomized phase III trial is studying risedronate to see how well it works compared to a placebo in improving bone mineral density and bone health in postmenopausal women with ductal carcinoma in situ enrolled in clinical trial CRUK-IBIS-II-DCIS.

Study Type: Interventional

Study Design: Supportive Care, Randomized, Double-Blind

OBJECTIVES:

Primary - Compare the changes in bone of the spine and femur in postmenopausal women with ductal carcinoma in situ treated with anastrozole vs placebo on protocol CRUK-IBIS-II-DCIS. - Determine the effect of bisphosphonate treatment on bone mineral density and bone metabolism in patients who are receiving anastrozole on protocol CRUK-IBIS-II-DCIS and are osteoporotic or moderately to severely osteopenic at baseline.

Secondary - Correlate changes in levels of biochemical markers of bone metabolism with longer-term changes in bone mineral density, as measured by dual-energy x-ray absorptiometry (DXA).

OUTLINE: This is a multicenter, partially randomized, double-blind study. Patients are stratified according to bone mineral density (T-score) measurements (≥ -1.5 vs -2.5 to < -1.5 vs -4.0 to < -2.5 or ≤ 2 low-trauma vertebral fractures). Patients in stratum I are further stratified according to calcium and cholecalciferol (vitamin D) supplementation (yes vs no) and use of risedronate on this study (yes vs no). Patients in stratum II are further stratified according to randomized treatment on protocol CRUK-IBIS-II-DCIS (yes vs no). - Stratum I (T-score ≥ -1.5): Patients undergo dual-energy x-ray absorptiometry (DXA) scanning at baseline and then at 1, 3, 5, and 7 years. Patients who develop osteoporosis (T-score < -2.5) are removed from the study and receive open-label bisphosphonates. - Stratum II (T-score -2.5 to < -1.5 [moderate to severe osteopenia]): Patients undergo DXA scanning as in stratum I. Patients are also randomized (double-blind) to 1 of 2 treatment arms. - Arm I: Patients receive oral risedronate once a week for 5 years. - Arm II: Patients receive oral placebo once a week for 5 years. Patients in either arm who develop osteoporosis AND a drop in T-score of more than 1 unit are removed from the study and receive open-label bisphosphonates. - Stratum III (T-score -4.0 to < -2.5 OR ≤ 2 low trauma vertebral fractures [osteoporosis]): Patients undergo DXA scanning as in stratum I. Patients also receive oral risedronate (or their current bisphosphonate) once a week for 5 years.

Blood samples for correlative studies (e.g., bone biomarkers, serum estradiol) are collected at baseline and at 6 and 12 months.

After completion of study treatment, patients are followed periodically.

PROJECTED ACCRUAL: A total of 1,000 patients will be accrued for this study.

Intervention(s) in this Clinical Trial

• Drug: risedronate sodium
• Procedure: laboratory biomarker analysis

Primary Measures

• Spine and femur bone change comparison
• Effects of bisphosphonate on bone mineral density and bone metabolism in patients who were osteoporotic or moderately severe osteopenic at baseline

Secondary Measures

• Correlation of changes in levels of biochemical markers of bone metabolism with longer-term changes in bone mineral density as measured by dual-energy x-ray absorptiometry (DXA)

DISEASE CHARACTERISTICS:

• Diagnosis of ductal carcinoma in situ within the past 6 months
• Locally excised with tumor-free margins at least 1 mm
• Currently enrolled in protocol CRUK-IBIS-II-DCIS AND randomized to receive either anastrozole or placebo
• No T-score < -4.0 and/or > 2 low trauma vertebral fractures by dual-energy x-ray absorptiometry (DXA)
• Hormone receptor status: Estrogen or progesterone receptor positive tumor

PATIENT CHARACTERISTICS:

• Female patient
• Postmenopausal
• No prior bilateral hip fracture or bilateral hip prostheses
• No concurrent metabolic bone disease, including any of the following:
• Paget's disease
• Osteogenesis imperfecta
• Disorders of calcium or mineral metabolism
• Renal calculus
• Malabsorption
• Hypercalcemia or hypocalcemia
• Hyperparathyroidism or hypoparathyroidism
• Hyperthyroidism or hypothyroidism
• Patients on stable replacement therapy are allowed provided they are euthyroid

PRIOR CONCURRENT THERAPY:

• More than 12 months since prior medication affecting bone metabolism, including any of the following:
• Estrogen
• Any bisphosphonate
• Parathyroid hormone
• Calcitonin
• Oral or systemic glucocorticoids

Gender Eligibility for this Clinical Trial: Female

Minimum Age for this Clinical Trial: 40 Years

Maximum Age for this Clinical Trial: 70 Years

Are Healthy Volunteers Accepted for this Clinical Trial?: No

Lead Sponsor: International Breast Cancer Study Group

Overall Clinical Trial Officials and Contacts

Katharina S. Buser, MD Principal Investigator Oncocare Sonnenhof-Klinik Engeriedspital  

Information obtained from ClinicalTrials.gov on September 05, 2008

Link to the current ClinicalTrials.gov record. http://clinicaltrials.gov/show/NCT00324714

Study ID Number: CDR0000474949

ClinicalTrials.gov Identifier: NCT00324714

Health Authority: Unspecified

Clinical trial summary from the National Cancer Institute's PDQ® database