SeizuresPhase 3RESTORE2NCT00235755
Retigabine Efficacy and Safety Trial for Partial Onset Refractory Seizures in Epilepsy
A Phase 3 study testing Retigabine in people with Seizures, run by GlaxoSmithKline at 70 sites in 13 countries.
Trial summary
This Phase 3 study is being conducted to evaluate the efficacy and safety of retigabine dosed at 900 mg/day and 600 mg/day, in three equally divided doses, compared with placebo in patients with epilepsy who are receiving up to three established antiepileptic drugs (AEDs). Read more about this study
- Who is it for?
- Ages 18 to 75 years
- Conditions the study is for
- Seizures
- What is being tested?
- Retigabine
- Type of treatment
- Pill or oral medicine
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 539 participants
- Where
- 70 sitesin 13 countries
- Study dates
- Dec 2005to Apr 2008
- Phase
- Phase 3
- Are there results?
- Yes, posted in the registrySummary in the doctors' view
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 75 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Diagnosis of refractory epilepsy with simple or complex partial onset seizures with or without secondary generalization
- 28-day partial seizure frequency rate of four or more partial seizures over the 8-week baseline phase
- Currently treated with up to three established AEDs
- Vagal Nerve Stimulator may be included
Who cannot join
- Existing medical or psychiatric condition which could affect patient's health or compromise ability to participate in the study
- Clinically significant abnormalities on physical exam, vital signs, ECG, or liver function tests
- Impaired renal function (creatinine clearance less than 50 mL/minute)
- Evidence of progressive central nervous disease, lesion, or encephalopathy
- History of primary generalized seizures
- History of clustering or flurries or status epilepticus within 12 months of study entry
Trial locations and contacts
70 sites in 13 countries.
70 sites in 13 countries
South Africa9 sites
Carl Bremer Hospital
Belville, West Cape, 7531
University of the Free State
Bloemfontein, Gauteng, 9300
Groote Schuur Hospital
Cape Town, Western Cape, 7925
Panorama Medi-Clinic
Cape Town, 7550
Inkosi Albert Luthuli Central Hospital
Durban, KwaZulu-Natal, 4091
Johannesburg Hospital
Johannesburg, Gauten, 2193
Triple M Research
Port Elizabeth, East Cape, 6001
Wilgers MR & Medical Centre
Pretoria, Gauteng, 0041
Sunninghill & Kopano Clinical Trials
Sunninghill, Gauteng, 2157
Israel8 sites
Barzilai Medical Center
Ashkelon, 78306
Assaf Harofeh Medical Center
Beer Yaakov, 70300
Rambam Medical Center
Haifa, 31096
Wolfson Medical Center
Holon, 58100
Western Galilee Hospital
Nahariya, 22100
Chaim Sheba Medical Center
Ramat Gan, 52621
Kaplan Medical Center
Rehovot, 76100
Tel-Aviv Sourasky Medical Center
Tel Aviv, 64239
Germany7 sites
University of Bonn -- Department for Epileptplogy
Bonn, D-53105
Zentrum Epilepsie Erlangen (ZEE) der Universitaet Erlangen
Erlangen, BY 91054
Georg-August-Universitaet Goettingen
Göttingen, NI 37075
Universitaetsklinik Mainz Neurologische Klinik
Mainz, RP 55101
Universitaet Giessen / Marburg Neurologie
Marburg, HE 35033
Theatinerstrasse 44
Munich, BY 80333
Universitaetsklinikum Ulm
Ulm, BW 89081
Poland7 sites
NZOZ Przychodnia Internistyczno - Stomatologiczna "Kendron"
Bialystok, 15-420
Wojewodzki Szpital Specjalistyczny im.Mikolaja Kopernika
Gdansk, 80-803
Katedra i Klinika Neurologii Slaskiej Akademii Medycznej
Katowice, 40-752
WSS im.Kardynala S. Wyszynskiego
Lublin, 20-718
Specjalistyczna Przychodnia Lekarska Medikard
Padlewskiego 4, Plock, 09-402
Instytut Psychiatrii i Neurologii II Oddzial Neurologii
Warsaw, 02-957
Prywatna Wielospecjalistyczna Lecznica Medyczna "Zycie"
Warsaw, 03-464
Russia6 sites
Interregional Clinical Diagnostic Centre
Kazan', 420048
City Hospital # 1
Moscow, 117049
Clinic of Nervous Diseases of Sechenov's Moscow Med. Academy
Moscow, 119021
District Antiepileptic Centre City Clinical Hospital # 71
Moscow, 121374
Military Medical Academy n.a. S.M.Kirov
Saint Petersburg, 194044
St.Petersburg State Medical University n.a. I.P.Pavlov
Saint Petersburg, 197022
Spain6 sites
Hospital de La Santa Creu i Sant Pau
Barcelona, 08025
Hospital de Cruces
Bilbao, 48903
Hosp de Donostia
Donostia / San Sebastian, 20014
Hosp. Virgen de las Nieves
Granada, 18013
Hospital Ruber Internacional de Madrid
Madrid, 28034
Hosp. Clinico Univ. Lozano Blesa
Zaragoza, 50009
Australia5 sites
Royal Prince Alfred Hospital
Camperdown, New South Wales, 2050
Monash Medical Centre
Clayton, Victoria, 3168
North Coast Neurology Centre
Maroochydore, Queensland, 4558
Royal Melbourne Hospital
Parkville, Victoria, 3050
Austin & Repatriation Medical Centre
West Heidelberg, Victoria, 3084
Ukraine5 sites
Psychosomatic Center of Dnepropetr. Regional Clinic
Dnipro, 49616
Kharkiv State Medical University
Kharkiv, 61022
Institute of Neurology, Psychiatry and Narcology of AMS, Ukr
Kharkiv, 61068
Epilepsy Center of Municipal Clinical Psychoneurological Hospital
Kiev, 04080
Odessa Regional Clinical Hospital
Odesa, 65025
United Kingdom5 sites
Fylde Coast Hospital
Blackpool, LANARK FY3 8BP
Western Infirmary (Epilepsy)
Glasgow, G11 6NT
Walton Centre for Neurology & Neurosurgery
Liverpool, L9 7LJ
Royal London Hospital
London, GT LON E1 1BB
The James Cook University Hospital
Middlesbrough, Mersyd, T&W TS4 3BW
Belgium4 sites
A. Z. Middelheim -- Department of Neurology
Antwerp, 2020
AZ Sint-Jan
Bruges, 8000
Universitaire Ziekenhuizen Gasthuisberg -- Department Neurology
Leuven, 3000
Centre Neurologique William Lennox
Ottignies, 1340
France4 sites
Hopital Neurologique Pierre Wertheimer
Lyon, Lyonnais, 69003
CHU Pontchaillou
Rennes, 35033
Hopital Civil de Strasbourg
Strasbourg, 67 67091
Centre Medical de La Teppe
Tain-l'Hermitage, 26 26600
United States2 sites
Mid-Atlantic Epilepsy and Sleep Center
Bethesda, Maryland, 20817
Neurological Clinic-Texas
Dallas, Texas, 75230
Hungary2 sites
Natl. Inst. of Psychiatry and Neurology
Budapest, 1021
Orszagos Idegsebeszeti Tudomanyos Intezet
Budapest, 1145
About this study
Official title: Randomized, Double-Blind, Placebo-Controlled, Multicenter, Parallel-Group Phase 3 Study - Determine Efficacy and Safety of Two Doses of Retigabine (900 Mg/Day and 600 Mg/Day) Used as Adjunctive Therapy in Refractory Epilepsy Patients With Partial-Onset Seizures
This Phase 3 study is being conducted to evaluate the efficacy and safety of retigabine dosed at 900 mg/day and 600 mg/day, in three equally divided doses, compared with placebo in patients with epilepsy who are receiving up to three established antiepileptic drugs (AEDs).
Read the detailed description
This Phase 3 study is being conducted in Europe, Israel, Australia, and South Africa to evaluate the efficacy and safety of retigabine dosed at 900 mg/day and 600 mg/day, in three equally divided doses, compared with placebo in patients with epilepsy who are receiving up to three established antiepileptic drugs (AEDs). The primary objective is to demonstrate a superior change in total partial seizure frequency for four weeks from baseline to the double-blind period. The proportion of responders (greater than or equal to 50% reduction in seizure frequency for four weeks from baseline to the double-blind period) will also be evaluated.
- Conditions
- Seizures
- Being tested
- Retigabine, Placebo
- Keywords
- Partial Seizures, Complex Partial Seizures, Epilepsy, Potassium Channels, Anticonvulsant
- Medical subject headings
- Seizures, Epilepsy
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
RetigabineDrug
Also called GKE-841, D-23129
Oral tablet. The starting daily dose will be 300 mg/day administered orally in three equally divided doses. This dosage will be increased by 150 mg/day (50 mg/dose) at 1-week intervals (titration phase). At the beginning of Week 3, patients will enter a 12 week maintenance phase.
RetigabineDrug
Also called GKE-841, D-23129
Oral tablet. The starting daily dose will be 300 mg/day administered orally in three equally divided doses. This dosage will be increased by 150 mg/day (50 mg/dose) at 1-week intervals (titration phase). At the beginning of Week 5, patients will enter a 12 week maintenance phase.
PlaceboDrug
Oral tablet.
| Study group | Role | What they receive |
|---|---|---|
| Placebo | Placebo comparator | Not described Receives: Drug: Placebo |
| Retigabine 600 mg | Experimental | Not described Receives: Drug: Retigabine |
| Retigabine 900 mg | Experimental | Not described Receives: Drug: Retigabine |
What is being measured
The primary outcome is the main question the study is designed to answer.
Percent Change in the 28-day Total Partial Seizure (PS) Frequency From Baseline (BL) to the End of the Double-blind (DB) Phase (Titration and Maintenance Phases)
28-day total PS (PSs [also called focal seizures] are seizures limited to a specific area of the brain) frequency in the BL period = (Number [No.] of total PSs reported in the BL period divided by the No. of days of available total PS data in the BL period) x 28 days. 28-day total PS frequency in the DB period = (No. of total PSs reported in the DB period divided by the No. of days of available total PS data in the DB period) x 28 days. Percent change = ([value in the DB period minus value at BL] divided by the BL value) x 100%. Negative valu es indicate a reduction in seizure frequency.
Measured: Baseline (Week -7 through Week 0), DB Phase (Week 1 through Week 16)
Number of Participants Classified as Responders and Non-responders During the Maintenance Phase
Responders were participants with at least a 50% reduction in the 28-day total partial seizure frequency in the Maintenance Phase as compared to the Baseline period.
Measured: Week 5 through Week 16
Secondary outcomes (18)
Number of Participants Who Were Responders and Non-responders During the DB Phase
Responders were participants with at least a 50% reduction in the 28-day total partial seizure frequency in the DB Phase as compared to the Baseline period. Participants without any post-baseline data were considered non-responders.
Measured: Week 1 through Week 16
Percent Change From Baseline (BL) in the 28-day Total Partial Seizure Frequency During the Maintenance Phase
28-day total partial seizure frequency in the BL period = (No. of total partial seizures reported in the BL period divided by the No. of days of available total partial seizure data in the BL period) x 28 days. 28-day total partial seizure frequency in the Maintenance Phase = (No. of total partial seizures reported in the Maintenance Phase divided by the No. of days of available total partial seizure data in the same phase) x 28 days. Percent change = (value in the Maintenance Phase minus value at BL divided by the BL value) x 100%. Negative values indicate a reduction in seizure frequency.
Measured: Baseline (Week -7 through Week 0), Week 5 through Week 16
Number of Participants With a Reduction in the 28-day Total Partial Seizure Frequency From Baseline to the End of DB Phase (Titration and Maintenance Phases) by Indicated Quartile Reduction Categories
Participants who experienced a reduction from Baseline in the 28-day total partial seizure frequency were categorized as having a reduction of 75-100%, 50-<75%, 25-<50%, or <25%, in addition to having no reduction. This quartile cutting was specified in the study protocol. Participants without any post-baseline data are included in the "No reduction" category.
Measured: Baseline (Week -7 through Week 0), Week 1 through Week 16
Number of Participants With a Reduction in the 28-day Total Partial Seizure Frequency From Baseline to the DB Phase (Titration and Maintenance Phases) by Indicated Decile Reduction and Increase Categories
Participants who experienced a reduction from Baseline in the 28-day total partial seizure frequency were categorized in decile cutting, i.e., reduction categories of 90-100%, 80-<90%, 70-<80%, 60-<70%, 50-<60%, 40-<50%, 30-<40%, 20-<30%, 10-<20%, >0-<10%, and increase categories of 0-10%, >10-20%, >20-30%, >30% (FDA endpoint). Participants without any post-baseline data were included in the category 0-10% increase category.
Measured: Baseline (Week -7 through Week 0), Week 1 through Week 16
Number of Participants With the Indicated Reduction From Baseline in the 28-day Total Partial Seizure Frequency During the Maintenance Phase
Participants who experienced a reduction from Baseline in the 28-day total partial seizure frequency were categorized as having a >75%, a 50-75%, or a <50% reduction, in addition to having no reduction (EMEA endpoint).
Measured: Baseline (Week -7 through Week 0), Week 5 through Week 16
Number of Participants Who Experienced the Indicated Level of Exacerbation and Reduction in the 28-day Total Partial Seizure Frequency From Baseline During the Maintenance Phase
Participants who experienced an exacerbation from Baseline in the 28-day total partial seizure frequency were categorized as having a 0-25% or a >25% increase (EMEA endpoint). The number of participants experiencing a >0% reduction from Baseline in the 28-day total partial seizure frequency are also presented.
Measured: Baseline (Week -7 through Week 0), Week 5 through Week 16
Number of Participants Reporting New Seizure Types in the Indicated Categories During the DB Phase (Titration and Maintenance Phases) That Were Not Reported at Baseline
New seizure types included those seizures which were not reported by any participant at Baseline.
Measured: Baseline (Week -7 through Week 0), Week 1 through Week 16
Number of Participants Who Were Seizure-free During the DB Phase (Titration and Maintenance Phases)
Participants were considered to be seizure-free if they had not reported any seizures during the DB treatment period (Weeks 1-18). For a participant to be seizure free during the DB Phase, the participant had to be seizure free both Week 7 to Week 18 and Week 1 to Week 6. A participant could be seizure free Week 7 to Week 18 (during the Maintenance Phase), but not seizure free Week 1 to Week 6. Hence, there are fewer participants being reported as seizure free from Week 1 to Week 18 than from Week 7 to Week 18.
Measured: Week 1 through Week 16
Number of Participants Who Were Seizure-free During the Maintenance Phase
Participants were considered to be seizure-free if they had not reported any seizures during the Maintenance Phase.
Measured: Week 5 through Week 16
Percentage of Seizure-free Days During the DB Phase (Titration and Maintenance Phases)
A seizure-free day was a day without any seizures. For a participant to be seizure free during the DB Phase, the participant had to be seizure free both Week 7 to Week 18 and Week 1 to Week 6. A participant could be seizure free Week 7 to Week 18 (during the Maintenance Phase), but not seizure free Week 1 to Week 6. Hence, there are fewer participants being reported as seizure free from Week 1 to Week 18 than from Week 7 to Week 18. The percentage of seizure-free days was calculated as the total number of days without seizures in the DB period divided by the number of days in DB period x 100%.
Measured: Week 1 through Week 16
Percentage of Seizure-free Days During the Maintenance Phase
A seizure-free day was a day without any seizures. The percentage of seizure-free days was calculated as the total number of days without seizures in the Maintenance Phase divided by the number of days in the Maintenance Phase x 100%.
Measured: Week 5 through Week 16
Clinical Global Impression-Improvement (CGI-I) Score at the End of the Maintenance Phase
Clinical Global Impression of Improvement (CGI-I) is a 7-point scale that requires the clinician to assess how much the participant's illness has improved or worsened relative to a baseline state at the beginning of the treatment. Scores on the scale are rated as: 1, very much improved; 2, much improved; 3, minimally improved; 4, no change; 5, minimally worse; 6, much worse; or 7, very much worse.
Measured: Week 16/end of treatment phase
Patient Global Impression (PGI) Score at the End of the Maintenance Phase
PGI is a participant-rated scale of improvement that was administered at the end of the Maintenance Phase in order to assess the participant's impression of his or her own improvement. PGI assessments were scored using a 7-point scale: 1, very much improved; 2, much improved; 3, minimally improved; 4, no change; 5, minimally worse; 6, much worse; or 7, very much worse.
Measured: Week 16/end of treatment phase
Quality of Life Assessed by Quality of Life in Epilepsy-Problems Questionnaire (QOLIE-31-P) at BL (Week 0) and Weeks 4, 8, and 16
The QOLIE-31-P is a 31-item questionnaire evaluating a participant's QOL perception in 7 domains: seizure worry, emotional well being, energy/fatigue, cognitive functioning, medication effects, social functioning, overall QOL. Precoded numeric values for some domains are such that a higher number reflects a more favorable health state; others are such that a higher number reflects a less favorable state. Precoded values are first converted to 0-100 point scores; higher converted scores always reflect better QOL. The overall score is derived by weighting and then summing the 7 domain scores.
Measured: End of Baseline (Week 0), Weeks 4, 8, and 16
Number of Participants Whose Clinical Laboratory Values Were Deemed an Adverse Event by the Investigator (>=2% in Any Treatment Arm)
Clinically important changes in laboratory values were to be reported as an adverse event if they met one of the following criteria: (1) intervention required; (2) change in dose of study drug required; (3) other treatment/therapy required; (4) association with other diagnoses.
Measured: Week 1 through Week 16
Number of Participants Who Reported the Indicated Renal and Urinary Disorder Adverse Events at a Frequency Threshold of 2% (in Any Treatment Arm)
A summary of the adverse events classified as renal or urinary disorders and in which at least 2% (rounded to an integer) of participants in any treatment arm reported during the study is presented.
Measured: Week 1 through Week 16
Change From Baseline in Post-void Residual Urine Volume at Weeks 8 and 16 of the Maintenance Phase
Post-void residual (PVR) urine refers to the amount of urine remaining in the bladder after normal urination. To investigate the possible effects of retigabine on bladder function, all participants underwent post-void residual bladder ultrasound at Baseline and during the Maintenance Phase. The PVR bladder ultrasound was performed by a urologist, a qualified ultrasound technician, or a qualified study nurse who was certified to do PVR bladder ultrasound. Change from Baseline in PVR residual volume was calculated as the values at Week 10 and Week 16 minus the value at Baseline.
Measured: Baseline (Week -7 through 0), Weeks 8 and 16
Number of Participants With a >=7% Increase in Body Weight During Weeks 2 and 4 of theTitration Phase and Weeks 6, 8, 12, and 16 of the Maintenance Phase
The number of participants with recorded weight gain of >=7% over their baseline weight was measured.
Measured: Weeks 2 and 4 of Titration Phase and Weeks 6, 8, 12, and 16 of Maintenance Phase
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted10 Oct 2005 (estimated)
- Study startDec 2005
- Primary completionApr 2008
- Study completionApr 2008
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
- Publications (4)Papers the sponsor has linked to this study.
- Other trials for SeizuresStudies of the same condition, open and under way.
- More trials run by GlaxoSmithKlineThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 3
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind
- Who is masked
- Participant, Investigator
- Enrolment
- 539 participants (actual)
Sponsor and investigators
- Lead sponsor
- GlaxoSmithKline
- Sponsor type
- Industry (pharma, biotech, devices)
- Collaborators
- Bausch Health Americas, Inc.
- Responsible party
- Sponsor
- Investigators
- GSK Clinical Trials, Study director, GlaxoSmithKline
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00235755
- Sponsor's protocol ID
- VRX-RET-E22-302
- Acronym
- RESTORE2
- Status last verified
- Mar 2017
- First submitted
- 6 Oct 2005
- Last updated
- 21 Apr 2017
- Results posted
- Yes, on ClinicalTrials.gov
- Data monitoring committee
- No
Publications
Brodie MJ, Lerche H, Gil-Nagel A, Elger C, Hall S, Shin P, Nohria V, Mansbach H; RESTORE 2 Study Group. Efficacy and safety of adjunctive ezogabine (retigabine) in refractory partial epilepsy. Neurology. 2010 Nov 16;75(20):1817-24. doi: 10.1212/WNL.0b013e3181fd6170. Epub 2010 Oct 13.
PubMed 20944074Tompson DJ, Crean CS. Clinical pharmacokinetics of retigabine/ezogabine. Curr Clin Pharmacol. 2013 Nov;8(4):319-31. doi: 10.2174/15748847113089990053.
PubMed 23342983Brickel N, Gandhi P, VanLandingham K, Hammond J, DeRossett S. The urinary safety profile and secondary renal effects of retigabine (ezogabine): a first-in-class antiepileptic drug that targets KCNQ (K(v)7) potassium channels. Epilepsia. 2012 Apr;53(4):606-12. doi: 10.1111/j.1528-1167.2012.03441.x. Epub 2012 Mar 16.
PubMed 22428574Porter RJ, Burdette DE, Gil-Nagel A, Hall ST, White R, Shaikh S, DeRossett SE. Retigabine as adjunctive therapy in adults with partial-onset seizures: integrated analysis of three pivotal controlled trials. Epilepsy Res. 2012 Aug;101(1-2):103-12. doi: 10.1016/j.eplepsyres.2012.03.010. Epub 2012 Apr 16.
PubMed 22512894
Study at a glance
From the registry record, last updated by the sponsor on 21 Apr 2017. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Randomized, Double-Blind, Placebo-Controlled, Multicenter, Parallel-Group Phase 3 Study - Determine Efficacy and Safety of Two Doses of Retigabine (900 Mg/Day and 600 Mg/Day) Used as Adjunctive Therapy in Refractory Epilepsy Patients With Partial-Onset Seizures
- ClinicalTrials.gov ID
- NCT00235755
- Acronym / sponsor ID
- RESTORE2 / VRX-RET-E22-302
- Conditions
- Seizures
- Keywords
- Partial Seizures, Complex Partial Seizures, Epilepsy, Potassium Channels, Anticonvulsant
- Phase
- Phase 3
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 539 participants (actual)
- Lead sponsor
- GlaxoSmithKlineIndustry (pharma, biotech, devices)
- Collaborators
- Bausch Health Americas, Inc.
- Study start
- Dec 2005
- Primary completion
- Apr 2008 (actual)
- Study completion
- Apr 2008 (actual)
- First posted
- 10 Oct 2005 (estimated)
- Results
- Posted 7 Nov 2011
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This Phase 3 study is being conducted to evaluate the efficacy and safety of retigabine dosed at 900 mg/day and 600 mg/day, in three equally divided doses, compared with placebo in patients with epilepsy who are receiving up to three established antiepileptic drugs (AEDs).
Detailed description
This Phase 3 study is being conducted in Europe, Israel, Australia, and South Africa to evaluate the efficacy and safety of retigabine dosed at 900 mg/day and 600 mg/day, in three equally divided doses, compared with placebo in patients with epilepsy who are receiving up to three established antiepileptic drugs (AEDs). The primary objective is to demonstrate a superior change in total partial seizure frequency for four weeks from baseline to the double-blind period. The proportion of responders (greater than or equal to 50% reduction in seizure frequency for four weeks from baseline to the double-blind period) will also be evaluated.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind (participant, investigator)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Placebo | Placebo comparator | Drug: Placebo |
| Retigabine 600 mg | Experimental | Drug: Retigabine |
| Retigabine 900 mg | Experimental | Drug: Retigabine |
Who may qualify
- Ages
- 18 to 75 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- Diagnosis of refractory epilepsy with simple or complex partial onset seizures with or without secondary generalization
- 28-day partial seizure frequency rate of four or more partial seizures over the 8-week baseline phase
- Currently treated with up to three established AEDs
- Vagal Nerve Stimulator may be included
Key exclusion criteria (6 listed)
- Existing medical or psychiatric condition which could affect patient's health or compromise ability to participate in the study
- Clinically significant abnormalities on physical exam, vital signs, ECG, or liver function tests
- Impaired renal function (creatinine clearance less than 50 mL/minute)
- Evidence of progressive central nervous disease, lesion, or encephalopathy
- History of primary generalized seizures
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| RetigabineAlso: GKE-841, D-23129Oral tablet. The starting daily dose will be 300 mg/day administered orally in three equally divided doses. This dosage will be increased by 150 mg/day (50 mg/dose) at 1-week intervals (titration phase). At the beginning of Week 3, patients will enter a 12 week maintenance phase. | Drug | Retigabine 600 mg |
| RetigabineAlso: GKE-841, D-23129Oral tablet. The starting daily dose will be 300 mg/day administered orally in three equally divided doses. This dosage will be increased by 150 mg/day (50 mg/dose) at 1-week intervals (titration phase). At the beginning of Week 5, patients will enter a 12 week maintenance phase. | Drug | Retigabine 900 mg |
| PlaceboOral tablet. | Drug | Placebo |
Primary outcome
Percent Change in the 28-day Total Partial Seizure (PS) Frequency From Baseline (BL) to the End of the Double-blind (DB) Phase (Titration and Maintenance Phases)
Time frame: Baseline (Week -7 through Week 0), DB Phase (Week 1 through Week 16)
28-day total PS (PSs [also called focal seizures] are seizures limited to a specific area of the brain) frequency in the BL period = (Number [No.] of total PSs reported in the BL period divided by the No. of days of available total PS data in the BL period) x 28 days. 28-day total PS frequency in the DB period = (No. of total PSs reported in the DB period divided by the No. of days of available total PS data in the DB period) x 28 days. Percent change = ([value in the DB period minus value at BL] divided by the BL value) x 100%. Negative valu es indicate a reduction in seizure frequency.
Number of Participants Classified as Responders and Non-responders During the Maintenance Phase
Time frame: Week 5 through Week 16
Responders were participants with at least a 50% reduction in the 28-day total partial seizure frequency in the Maintenance Phase as compared to the Baseline period.
18 secondary outcomes
Number of Participants Who Were Responders and Non-responders During the DB Phase
Time frame: Week 1 through Week 16
Percent Change From Baseline (BL) in the 28-day Total Partial Seizure Frequency During the Maintenance Phase
Time frame: Baseline (Week -7 through Week 0), Week 5 through Week 16
Number of Participants With a Reduction in the 28-day Total Partial Seizure Frequency From Baseline to the End of DB Phase (Titration and Maintenance Phases) by Indicated Quartile Reduction Categories
Time frame: Baseline (Week -7 through Week 0), Week 1 through Week 16
Number of Participants With a Reduction in the 28-day Total Partial Seizure Frequency From Baseline to the DB Phase (Titration and Maintenance Phases) by Indicated Decile Reduction and Increase Categories
Time frame: Baseline (Week -7 through Week 0), Week 1 through Week 16
Number of Participants With the Indicated Reduction From Baseline in the 28-day Total Partial Seizure Frequency During the Maintenance Phase
Time frame: Baseline (Week -7 through Week 0), Week 5 through Week 16
Number of Participants Who Experienced the Indicated Level of Exacerbation and Reduction in the 28-day Total Partial Seizure Frequency From Baseline During the Maintenance Phase
Time frame: Baseline (Week -7 through Week 0), Week 5 through Week 16
Number of Participants Reporting New Seizure Types in the Indicated Categories During the DB Phase (Titration and Maintenance Phases) That Were Not Reported at Baseline
Time frame: Baseline (Week -7 through Week 0), Week 1 through Week 16
Number of Participants Who Were Seizure-free During the DB Phase (Titration and Maintenance Phases)
Time frame: Week 1 through Week 16
Number of Participants Who Were Seizure-free During the Maintenance Phase
Time frame: Week 5 through Week 16
Percentage of Seizure-free Days During the DB Phase (Titration and Maintenance Phases)
Time frame: Week 1 through Week 16
Percentage of Seizure-free Days During the Maintenance Phase
Time frame: Week 5 through Week 16
Clinical Global Impression-Improvement (CGI-I) Score at the End of the Maintenance Phase
Time frame: Week 16/end of treatment phase
Patient Global Impression (PGI) Score at the End of the Maintenance Phase
Time frame: Week 16/end of treatment phase
Quality of Life Assessed by Quality of Life in Epilepsy-Problems Questionnaire (QOLIE-31-P) at BL (Week 0) and Weeks 4, 8, and 16
Time frame: End of Baseline (Week 0), Weeks 4, 8, and 16
Number of Participants Whose Clinical Laboratory Values Were Deemed an Adverse Event by the Investigator (>=2% in Any Treatment Arm)
Time frame: Week 1 through Week 16
Number of Participants Who Reported the Indicated Renal and Urinary Disorder Adverse Events at a Frequency Threshold of 2% (in Any Treatment Arm)
Time frame: Week 1 through Week 16
Change From Baseline in Post-void Residual Urine Volume at Weeks 8 and 16 of the Maintenance Phase
Time frame: Baseline (Week -7 through 0), Weeks 8 and 16
Number of Participants With a >=7% Increase in Body Weight During Weeks 2 and 4 of theTitration Phase and Weeks 6, 8, 12, and 16 of the Maintenance Phase
Time frame: Weeks 2 and 4 of Titration Phase and Weeks 6, 8, 12, and 16 of Maintenance Phase
Results and safety
Loading the posted results from ClinicalTrials.gov…
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 21 Apr 2017.
- Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
- Background: PubMed 20944074Brodie MJ, Lerche H, Gil-Nagel A, Elger C, Hall S, Shin P, Nohria V, Mansbach H; RESTORE 2 Study Group. Efficacy and safety of adjunctive ezogabine (retigabine) in refractory partial epilepsy. Neurology. 2010 Nov 16;75(20):1817-24. doi: 10.1212/WNL.0b013e3181fd6170. Epub 2010 Oct 13.
- Background: PubMed 23342983Tompson DJ, Crean CS. Clinical pharmacokinetics of retigabine/ezogabine. Curr Clin Pharmacol. 2013 Nov;8(4):319-31. doi: 10.2174/15748847113089990053.
- Background: PubMed 22428574Brickel N, Gandhi P, VanLandingham K, Hammond J, DeRossett S. The urinary safety profile and secondary renal effects of retigabine (ezogabine): a first-in-class antiepileptic drug that targets KCNQ (K(v)7) potassium channels. Epilepsia. 2012 Apr;53(4):606-12. doi: 10.1111/j.1528-1167.2012.03441.x. Epub 2012 Mar 16.
- Derived from this study: PubMed 22512894Porter RJ, Burdette DE, Gil-Nagel A, Hall ST, White R, Shaikh S, DeRossett SE. Retigabine as adjunctive therapy in adults with partial-onset seizures: integrated analysis of three pivotal controlled trials. Epilepsy Res. 2012 Aug;101(1-2):103-12. doi: 10.1016/j.eplepsyres.2012.03.010. Epub 2012 Apr 16.
- Researchers can use this site to request access to anonymised patient level data and/or supporting documents from clinical studies to conduct further research.Link provided by the sponsor.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
GSK Clinical Trials study director
GlaxoSmithKline
70 sites in 13 countries: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 3 study testing Retigabine in people with Seizures, run by GlaxoSmithKline at 70 sites in 13 countries.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 21 Apr 2017. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 70 sites in South Africa, Israel, Germany, Poland, Russia and 8 more countries. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
Yes. Results are posted in the registry (first posted 7 Nov 2011). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Percent Change in the 28-day Total Partial Seizure (PS) Frequency From Baseline (BL) to the End of the Double-blind (DB) Phase (Titration and Maintenance Phases) (time frame: Baseline (Week -7 through Week 0), DB Phase (Week 1 through Week 16)). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT00235755, which also lists 4 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Apr 2017.