Study of Alendronate to Prevent and Treat Osteoporosis in Cystic Fibrosis Patients

Study Overview
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Brief Summary
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The primary objective of this study is to determine efficacy of 70 mg alendronate once weekly compared to placebo. This will be measured by percent changes in lumbar spine(LS) bone mineral density(BMD) in adult cystic fibrosis(CF)patients after one year of treatment. The investigators hypothesize that in adult CF patients with osteopenia or osteoporosis, alendronate 70 mg once weekly will produce a mean increase from baseline in lumbar spine BMD that is greater than that observed with placebo at 12 months.

Detailed Description
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Randomized controled trial have begun to establish the efficacy and safety of bisphosphonates in CF patients with decreased BMD. The development of a once weekly dosing regimen of alendronate and the low prevalence of esophageal adverse events may be an advantageous therapeutic option for this high-risk population. This is a one-year randomized, double-blind, placebo-controlled, multicentre study in 55 CF patients with osteopenia or osteoporosis. Six Canadian centres are participating in this study. Patients randomized to treatment will receive 70 mg oral alendronate once weekly, while controls will receive identical placebo once weekly. All medication dispensed will be concealed. There will be no dose modification during the course of the trial. All patients will receive a total of 1000 mg calcium, 500 through supplementation and 500 through diet. All patients will continue to take vitamin D supplementation ( 2 tablets per day, 400 IU vitamin D/tablet).

Official Title
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A Multicentre, Double-Blind, Randomized Placebo-Controlled Study of 70mg Alendronate Once Weekly for the Prevention and Treatment of Osteoporosis in Canadian Adult Cystic Fibrosis Patients

Conditions
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Cystic Fibrosis, Osteoporosis, Bone Diseases, Metabolic

Intervention / Treatment
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* Drug: Alendronate
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: CF; confirmed by a positive sweat test or DNA analysis age 18 years or above at the time of informed consent osteopenia (-2.5< BMD t-score<1.0) or osteoporosis (BMD t-score <-2.5)t-score at the LS (1-4)or total hip provision of informed consent Exclusion Criteria: endoscopy-proven esophagitis, gastritis, ulceration, or abnormalities of the esophagus which delay esophageal emptying such as stricture, achalasia, or esophageal varices significantly impaired renal function; this is defined as serum creatinine >177 umol/L current or recent (within 1 year prior to randomization) consumption of an excess of alcohol or abuse of drugs; an excess of alcohol is defined as more than four of any of the following per day, or a combination of more that four of the following per day: 30 mL distilled spirits, 240 mL beer, or 120 mL wine history of prior organ transplantation any condition which may interfere with the evaluation of LS BMD as determined in a screening radiograph by a radiologist at the central facility e.g. spinal fusion, confluent aortic calcifications, surgical artefact, excessive osteophytes, or other permanent artefact; hip prostheses or any other condition that may interfere with the evaluation of hip BMD participation in another clinical trial 30 days prior to enrolment or within 6 half-lives of the study drug if applicable pregnancy, lactation, or a desire to become pregnant; safe effective birthcontrol must be used know hypersensitivity or abnormal reaction to study drug or other bisphosphonates use of drugs know to affect bone within 6 months of starting trial medication (e.g. thiazide, diuretics, calcitonin, calcitriol, anabolic steroids, estrogen or estrogen-related drugs (e.g. tamoxifen, raloxifene, tibolone high dose vaginal estrogen), progesterone, fluoride: this does not include the birth control pill patients currently receiving another bisphosphonate in whom treatment efficacy has been established; only patients who are intolerant to or did not respond to another bisphosphonate will be considered for inclusion; patients must have ceased treatment with any bisphosphonate for at least 1 year prior to enrolment use of systemic corticosteroids at a dose of at least 7.5 mg/day or greater within last 6 months concomitant use of any investigational drug other than the study medication current or recent (within 1 year prior to randomization) metabolic bone disorders other than secondary osteoporosis, such as Paget's disease, renal osteodystrophy, osteomalacia (25-OHD<25nmol/L), hypoparathyroidism, hyperparathyroidism; TSH outside normal laboratory range, with values that are assessed as clinically significant by the investigator; if on replacement therapy, dose should be stable and TSH within normal range for a minimum of 6 weeks prior to trial enrolment hypocalcemia from any cause, corrected for low albumin any history of cancer; for relatively benign skin malignancies, such as basal cell carcinoma or squamous cell carcinoma and patients with a history of successfully treated cervical carcinoma in istu, a documented six-month remission is required before study entry poor medical or psychiatric risk for treatment with an investigational drug

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: 1<br>Alendronate | Drug: Alendronate<br>* 70 mg 1x weekly for 12 months<br>* Other names: Fosamax;|
| Placebo Comparator: 2<br>Placebo | Drug: Placebo<br>* 70 mg 1 x weekly for 12 months<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| To determine efficacy of 70 mg alendronate once weekly compared to placebo, measured by changes in LS BMD in adult CF patients after one year of treatment |  | 12 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| To determine the efficacy of 70 mg alendronate once weekly compared to placebo measured by percent changes in total hip BMD, proximal femur BMD, and N-telopeptide at one year in adult CF patients. |  | 12 months | 
| To determine health-related quality of life (HRQL) using the SF-36 instrument. |  | 12 months | 
| To determine HRQL using the Cystic Fibrosis Questionnaire (CFQ). |  | 12 months | 
| To determine the safety of 70 mg of alendronate given once weekly compared with placebo in adult CF patients |  | 12 months | 
| To determine correlations between BMD and patient characteristics, including but not limited to the following: corticosteroid use, height, weight, body mass index BMI) and forced expired volume in 1 minute (FEV1). |  | 12 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Alendronate, Bisphosphonates, Cystic Fibrosis, Osteoporosis