Single Dosing of Zoledronic Acid in Cancer Therapy Induced Bone Loss (CTIBL)

Inclusion Criteria

• Postmenopausal women with Stage I, II or IIIa breast cancer being treated with a non-steroidal Aromatase Inhibitor (AI) .Negative bone scan (no bone metastases).
• Calculated creatinine clearance > 40 ml/min
• Documented T score of less than or equal to -1.5 on Dual Energy X-ray Absorptiionmetry (DXA) scan at the lumbar spine or femoral neck within 3 months prior to screening.
• Urine NTx > 50 nano moles(nM)based on second morning void.
• Signed informed consent.
• Ambulatory patients at least 18 years of age.
• Eastern Cooperative Oncology Group (ECOG)0-2.
• Ability to comply with trial requirements.

Exclusion Criteria

• Bone Metastases.
• Any woman of child bearing potential.
• Patients with fractures occurring within three months prior to randomization. - Greater than a 2+ protein on urine dipstick without evidence of contamination or bacteriuria (may be repeated one time, at least a day apart).
• Calculated creatinine clearance less than 30 mL/min at screening.
• Serum calcium > 2.75 mmol/L (11.0 mg/dL) or 2.0 x upper limit of normal (ULN).
• Serum alkaline phosphatase > 1.5 x ULN. History of hypersensitivity to bisphosphonates.
• Evidence of vitamin D deficiency (serum 25-(OH) D of less than 15 ng/ml).
• History of uveitis or iritis, except when secondary to trauma, and must have resolved > 2 years prior to entry.
• A history of invasive malignancy of any organ system, treated or untreated, within the past 12 months prior to screening; excluding, basal cell or squamous cell carcinoma of the skin, colonic polyps with non-invasive malignancy which have been removed, Ductal Carcinoma in-situ (DCIS) that has been surgically removed, and Carcinoma in-situ (CIS) of the uterine cervix that has been surgically removed.
• Previous major solid organ transplant recipient or on a transplant waiting list.
• Treatment with any investigational drug within 30 days prior to randomization.
• History of hyperparathyroidism, hypoparathyroidism, Osteogenesis imperfecta, Paget's disease or any metabolic bone disease other than osteoporosis.
• Any medical condition which would interfere with the action of the study drug or limit life expectancy to less than 6 months.
• Any medical or psychiatric condition which, in the opinion of the investigator, would preclude the participant from adhering to the protocol or completing the trial.
• Prior treatment with IV bisphosphonates within the last 2 years.
• Previous use of oral bisphosphonates within the past 2 years (unless used for less than 8 weeks*). *NOTE: If used less than 8 weeks, the washout period is 6 months.
• Treatment with raloxifene, calcitonin, tibolone or hormone replacement therapy. The washout period for these medications is 6 months prior to randomization.
• Any treatment with strontium ranelate, samarium, sodium fluoride or parathyroid hormone.
• Use of systemic high dose corticosteroids at an average dose of > 7.5 mg per day of oral prednisone or equivalent for a period of three months or more prior to screening.
• Known hypersensitivity to zoledronic acid or other bisphosphonates.
• Current active dental problems including infection of the teeth or jawbone (maxilla or mandibular); dental or fixture trauma, or a current or prior diagnosis of osteonecrosis of the jaw (ONJ), of exposed bone in the mouth, or of slow healing after dental procedures.
• Recent (within 6 weeks) or planned dental or jaw surgery (e.g.. extraction, implants).