A Safety and Efficacy Study for Tapentadol (CG5503) Extended Release for Patients With Painful Diabetic Peripheral Neuropathy
- Registration Number
- NCT00455520
- Brief Summary
The purpose of this study is to evaluate the effectiveness (level of pain control) and safety of Tapentadol (CG5503) extended release (ER) (base) compared to placebo in patients with moderate to severe pain from diabetic peripheral neuropathy.
- Detailed Description
The primary objective of this randomized-withdrawal (randomized means study medication assigned to patients by chance and withdrawal means to stop using), multicenter, double-blind (neither patient nor investigator knows the study medication), placebo-controlled, Phase 3 study is to determine the effectiveness and safety of orally administrated Tapentadol (CG5503) extended release (ER) (base) at doses of 100-250 mg twice daily in patients with moderate to severe pain from diabetic peripheral neuropathy. The study is being conducted for registration and approval of CG5503 in the US and outside US. The trial will consist of two phases: Phase I is open-label and Phase 2 is double- blind. In the Open-Label Phase 1 there will be four periods: screening (to assess eligibility), washout (dependent on the pain medication the patient was previously taking), pain intensity perctoris evaluation (over a 3 day period), and open-label titration (study drug will be titrated to an optimal dose starting with 50 mg twice a day and adjusted to an optimal dose for a period of 3 weeks). Patients with at least a 1-point reduction in the average pain intensity score at the end of the open-label titration period, as compared with pre-titration will be eligible for randomization in the double-blind phase. In the double-blind Phase 2, there will be two periods: double-blind maintenance period (take drug for 12 weeks), and follow-up (a visit within 4 days of the intake of the last dose of study drug and a follow-up call approximately 10-14 days after the intake of the last dose of the study drug). The patient will maintain the dose level achieved at the end of the Phase 1 during the double-blind treatment phase. The study hypothesis is that the study drug will be different from placebo in the change in pain intensity. Titrate Tapentadol (CG5503) extended release (ER) 50 mg to patient's optimal dose ranging between 100mg and 250mg twice a day; Placebo (no active ingredients). All doses of trial treatment will be taken orally with or without food, for a maximum timeframe of 15 weeks.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 395
- Patients with Type 1 or Type 2 diabetes mellitus must have a documented clinical diagnosis of painful diabetic peripheral neuropathy with symptoms and signs for at least 6 months, and pain present at the time of screening
- The investigator considers the patient's blood glucose to be controlled by diet, or hypoglycemics, or insulin for at least 3 months prior to enrolling in the study (this control should be documented by figures of glycated hemoglobin [HbA1c] no greater than 11% at screening)
- Patients have been taking analgesic medications for the condition for at least 3 months prior to screening (patients taking opioid analgesics must be dissatisfied with current treatment, and patients taking non-opioid analgesics must be dissatisfied with current analgesia)
- Patients currently requiring opioid treatment must be taking daily doses of an opioid-based analgesic equivalent to <=160 mg of oral morphine
- No significant pulmonary, gastrointestinal, endocrine, metabolic (except diabetes mellitus), neurological, psychiatric disorders (resulting in disorientation, memory impairment or inability to report accurately as in schizophrenia, Alzheimer's disease), or any other clinically significant disease that in the Investigator's opinion may affect efficacy or safety assessments or may compromise patient's safety during trial participation
- no history of moderate to severe hepatic impairment such as chronic hepatitis B or C, presence of active hepatitis B or C within the last 3 months or impaired hepatic function with ALT or AST greater than 3-fold ULN
- No patients with severely impaired renal function
- No laboratory values above or below limits of normal unless considered not clinically relevant by the Investigator
- No significant cardiac disease (e.g., unstable angina pectoris, angina pectoris Canadian Cardiovascular Society (CCS) class III-IV, acute myocardial infarction within the last 3 months, cardiac insufficiency New York Heart Association (NYHA) class III-IV) or significant vascular disease (e.g., peripheral arterial occlusive disease (PAOD) Fontaine class IIb-IV)
- no life-long history of seizure disorders or epilepsy
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description Placebo placebo placebo matching placebo twice daily for 12 weeks CG5503 CG5503 CG5503 100, 150, 200, 250mg twice daily given for up to 15 weeks
- Primary Outcome Measures
Name Time Method Change From Baseline (at Randomization) in Average Pain Intensity on an 11-point Numerical Rating Scale (NRS) Over the Last Week of the Double-blind Maintenance Period at Week 12 Baseline and 12 weeks For this twice daily pain assessment, the subjects were to indicate the level of pain experienced over the previous 12 hours on an 11-point Numerical Rating Scale (NRS) where a score of 0 indicated "no pain" and a score of 10 indicated "pain as bad as you can imagine".
- Secondary Outcome Measures
Name Time Method Change From Baseline in Sleep Latency Time in Hours Over the Last Week of the Maintenance Period at Week 12. Baseline and 12 week endpoint A Sleep Questionnaire addressed the following question: "How long after bedtime/lights out did you fall asleep last night (hours)?" 12 week endpoint-mean changes from baseline at endpoint for sleep latency. Decrease in time (hours) indicates improvement.
Change From Baseline in Brief Pain Inventory (BPI) Total Pain Score Over the Last Week of the Maintenance Period at Week 12. Baseline and12 week endpoint Total pain score where zero equals "no pain" to ten equals "pain as bad as you can imagine" from 12 week endpoint vs baseline.
The Number of Patients Achieving at Least 30% Improvement in Pain Score at Week 12 of the Double-blind Maintenance Period From the Start of the Open Label Period. Start of Open Label and at 12 weeks of Double Blind The number of patients achieving at least 30% improvement in pain score at Week 12 of the double-blind maintenance period on an 11-point numerical rating scale compared with the start of the open-label period.
Percentage of Patients Who Reported Very Much Improved or Much Improved From Baseline in Patient Global Impression of Change Over the Last Week of the Maintenance Period at Week 12 12 week endpoint Percentage of patients who reported very much improved (1) or much improved (2) based on an ordinal measure indicating change from start of double blind treatment (on a scale of 7 = Very much worse to 1 = Very much improved)
Change From Baseline in EuroQol-5 (EQ-5D) Health Status Index to Week 12 12 week endpoint (change from baseline) Change from baseline to end point in EuroQol-5 Dimension Questionnaire. A higher score indicates an improvement in health in the Health Status Index. The EuroQol-5 is a five dimensional health state classification. Each dimension is assessed on a 3-point ordinal scale (1=no problems, 2=some problems, 3=extreme problems). The responses to the five EQ-5D dimensions were scored using a utility-weighted algorithm to derive an EQ-5D health status index score between 0 to 1, with 1.00 indicating "full health" and 0 representing dead.