Beta-Cell Function and Sitagliptin Trial (BEST) (BEST)
A Randomized Controlled Pilot Study Assessing the Effect of Sitagliptin on the Preservation of Beta-Cell Function in Patients With Type 2 Diabetes
Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder characterized by progressive deterioration in the function of the pancreatic beta-cells, which are the cells that produce and secrete insulin (the hormone primarily responsible for the handling of glucose in the body). The investigators propose a double-blind, randomized controlled pilot study comparing the effect of sitagliptin (a novel anti-diabetic drug with beta-cell protective potential) versus placebo, on the preservation of beta-cell function over one year in patients with T2DM on metformin, the first-line agent for the treatment of T2DM (ie. the study groups will be (i) sitagliptin and metformin versus (ii) placebo and metformin). This study may demonstrate an important beta-cell protective capacity of sitagliptin.
Hypothesis: In patients with T2DM on metformin, treatment with the DPP-IV inhibitor sitagliptin will preserve pancreatic beta-cell function.
調査の概要
詳細な説明
研究の種類
入学 (実際)
段階
- フェーズ2
連絡先と場所
研究場所
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Ontario
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Toronto、Ontario、カナダ、M5T 3L9
- Leadership Sinai Centre for Diabetes
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参加基準
適格基準
就学可能な年齢
健康ボランティアの受け入れ
受講資格のある性別
説明
Inclusion Criteria:
- Men and women between the ages of 30 and 75 inclusive
- Physician-diagnosed type 2 diabetes on 0-2 oral hypoglycemic agents
- Negative for anti-glutamic acid decarboxylase (anti-GAD_ antibodies (to rule out Latent Autoimmune Diabetes of Adults (LADA)
- A1c at screening between 6.5% and 9% inclusive if on no oral hypoglycemic agents or 6.0% and 9.0% inclusive if on 1-2 oral hypoglycemic agents
Exclusion Criteria:
- Current insulin therapy
- Type 1 diabetes or secondary forms of diabetes
- Any major illness with a life expectancy of < 5 years or that may interfere with the patient's participation in the study
- Involvement in any other study requiring drug therapy
- Renal dysfunction as evidenced by serum creatinine >/= 136 umol/L for males or >/= 124 umol/L for females or abnormal creatinine clearance (< 60 ml/min by Modification of Diet in Renal Disease (MDRD) formula)
- Hepatic disease considered to be clinically significant (includes jaundice, chronic hepatitis, or previous liver transplant) or transaminases > 2.5 times the upper limit of normal
- Excessive alcohol consumption, defined as > 14 alcoholic drinks per week for males and > 9 alcoholic drinks per week for females
- Pregnancy or unwillingness to use reliable contraception. Women should not be planning pregnancy for the duration of the study. Reliable contraception includes: birth control pill, intra-uterine device, abstinence, tubal ligation, partner vasectomy, or condoms with spermicide. Any women who miss a menstrual period or think that they may be pregnant must have a pregnancy test as soon as possible
- History of serious arrhythmia or atrioventricular block on baseline electrocardiogram
- Uncontrolled hypertension (systolic blood pressure > 180 mm Hg or diastolic blood pressure > 110 mm Hg)
- Unwillingness to undergo multiple daily insulin injection therapy for 4 weeks
- Unwillingness to perform capillary blood glucose monitoring at least 4 times per day during intensive insulin therapy
研究計画
研究はどのように設計されていますか?
デザインの詳細
- 主な目的:処理
- 割り当て:ランダム化
- 介入モデル:並列代入
- マスキング:4倍
武器と介入
参加者グループ / アーム |
介入・治療 |
|---|---|
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実験的:Sitagliptin
Sitagliptin 100mg once a day (od) by mouth (po)
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sitagliptin 100 mg once a day
他の名前:
metformin 1000 mg twice a day (bid) by mouth (po)
他の名前:
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プラセボコンパレーター:Placebo arm
Placebo once a day (od) by mouth (po)
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metformin 1000 mg twice a day (bid) by mouth (po)
他の名前:
placebo once a day
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この研究は何を測定していますか?
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Preservation of Beta-cell Function Measured by Area-under-the-curve (C-peptide/Glucose)/HOMA-IR
時間枠:48 weeks
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Area-under-the-C-peptide-curve (AUCCpep) and area-under-the-glucose-curve (AUCgluc) from 0 to 240 minutes during meal tests were calculated using the trapezoidal rule.
Insulin resistance was assessed using the Homeostasis Model Assessment of Insulin Resistance (HOMA-IR).
Beta-cell function was assessed using the ratio of total AUCCpep to AUCgluc divided by HOMA-IR (AUCCpep/gluc/HOMA-IR), a measure of insulin secretion in the context of ambient insulin sensitivity, analogous to the disposition index and adaptation index.
Higher AUCCpep/gluc/HOMA-IR is indicative of better beta-cell function.
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48 weeks
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二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Insulinogenic Index Divided by HOMA-IR at 48 Weeks
時間枠:48 weeks
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Insulinogenic index was calculated as the incremental change in insulin from 0 to 30 minutes divided by the incremental change in glucose over the same period of time.
Insulinogenic index divided by HOMA-IR provides an additional measure of beta-cell function.
A higher value indicates better beta-cell function
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48 weeks
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Fasting Blood Glucose at 48 Weeks
時間枠:48 weeks
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48 weeks
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Area-under-the-glucose-curve (AUCglucose) on Meal Test at 1 Year
時間枠:1 year
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1 year
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Time to Loss of Glycemic Control
時間枠:1 year
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1 year
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Proportion of Patients Achieving Sustained Normoglycemia Off Medication at 1-week Post-insulin Therapy
時間枠:1 year
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1 year
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協力者と研究者
捜査官
- 主任研究者:Bernard Zinman, MD、Leadership Sinai Centre for Diabetes, University of Toronto
- 主任研究者:Ravi Retnakaran, MD、Leadership Sinai Centre for Diabetes, University of Toronto
出版物と役立つリンク
研究記録日
主要日程の研究
研究開始
一次修了 (実際)
研究の完了 (実際)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (見積もり)
学習記録の更新
投稿された最後の更新 (見積もり)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
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