Epilepsy Clinical Trial
Official title:
A Randomised, Double-blind, Placebo-controlled, Parallel-group, Multicentre Study to Determine the Efficacy and Safety of 2 Doses of Retigabine Immediate Release (900 mg/Day and 600 mg/Day) Used as Adjunctive Therapy in Adult Asian Subjects With Drug-resistant Partial-onset Seizures.
Verified date | June 2018 |
Source | GlaxoSmithKline |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Interventional |
The immediate release (IR) formulation of retigabine has been shown to be superior to placebo as adjunctive therapy in 3 adequate and well-controlled studies in subjects with drug-resistant partial-onset seizures (POS) who had previously failed to respond to two or more antiepileptic drugs (AEDs) and were still having seizures despite current treatment with 1, 2, or 3 AEDs. However, of 1244 subjects randomly assigned to treatment in these 3 clinical studies, only 10 were Asian subjects and only 5 of these Asian subjects were randomly assigned to treatment with retigabine. Therefore, this Phase III study is being conducted to evaluate the efficacy, safety and tolerability, and health outcomes of retigabine, at doses of 900 mg/day and 600 mg/day, compared with placebo in adult Asian subjects with drug-resistant POS.
Status | Terminated |
Enrollment | 76 |
Est. completion date | December 23, 2013 |
Est. primary completion date | December 1, 2013 |
Accepts healthy volunteers | No |
Gender | All |
Age group | 18 Years and older |
Eligibility |
Inclusion Criteria: Subjects eligible for enrolment in the study must meet all of the following criteria: - Asian men or women =18 years of age at the time of consent. - Have a confident diagnosis of epilepsy with POS with or without secondary generalisation (classified according to International League Against Epilepsy, 1981) for =2 years and is having POS despite having been treated in the past with =2 approved AEDs either alone or together at adequate doses for a sufficient length of time in the opinion of the investigator. - Have had, within the last 10 years, 1 electroencephalogram or video electroencephalogram and 1 brain magnetic resonance imaging or computerised tomography scan with results consistent with a diagnosis of POS. If diagnostic studies are negative and if history during clinical assessment suggests a diagnosis of POS, and other diseases have been excluded, the subject can be enrolled. - Have a documented 28-day partial seizure frequency rate of =4 partial seizures over the 8 weeks preceding the screening visit. subjects should not be seizure free for =21 consecutive days. In subjects with simple partial seizures, only seizures with motor signs will be counted towards meeting the inclusion criteria. - Currently being treated with a stable regimen of 1, 2, or 3 AEDs for =1 month prior to the screening visit. If the subject is taking barbiturates (e.g., phenobarbital), the dose of the barbiturate must have been stable for =3 months prior to the screening visit Note: Vagus Nerve Stimulator: VNS will not be counted as a concurrent AED. Subjects with surgically implanted VNS will be allowed to enter the study provided that all of the following conditions are met: a. The VNS has been in place for =6 months prior to the screening visit; b. The settings must have remained constant for =1 month prior to the screening visit and remain constant throughout the study; c. The battery is expected to last for the duration of the study; d. Subjects who are considering implantation of a VNS are excluded from participation in the study. Note: Benzodiazepines: The chronic use of a benzodiazepine as a concurrent AED is permitted as long as the dose is kept constant for =1 month prior to the screening visit and remains constant throughout the study. - Able and willing to maintain an accurate and complete daily written seizure calendar or has a caregiver who is able and willing to maintain an accurate and complete daily written seizure calendar. - Able to understand and willing to provide written informed consent, or has a legally authorised representative able to so, before any protocol-specific procedures are performed. - A female subject is eligible to enter and participate in the study if she is: a. Of non-childbearing potential (i.e., physiologically incapable of becoming pregnant, including any female who is postmenopausal); Premenopausal females with a documented (medical report verification) hysterectomy with or without oophorectomy or bilateral oophorectomy when reproductive status has been confirmed by hormone level assessment; Postmenopausal females defined as being amenorrheic for greater than 1 year with an appropriate clinical profile (e.g., age appropriate, history of vasomotor symptoms). However, if indicated, this should be confirmed by estradiol and follicle-stimulating hormone levels consistent with menopause (according to local laboratory ranges). Women who have not been confirmed as postmenopausal should be advised to use contraception as listed in the protocol: b. Of childbearing potential, has a negative serum pregnancy test at Screening and a negative urine and serum pregnancy test at randomisation, and agrees to satisfy one of the requirements listed in the protocol: c. Not pregnant or lactating (breastfeeding) or planning to become pregnant during the study. - Liver function tests: aspartate aminotransferase (AST) and alanine aminotransferase (ALT) <2 times the upper limit of normal (ULN); alkaline phosphatase (ALP) and bilirubin </=1.5 × ULN (isolated bilirubin >1.5 × ULN is acceptable if bilirubin is fractionated and direct bilirubin is <35%). Exclusion Criteria: Subjects meeting any of the following criteria must not be enrolled in the study: - Have generalised epilepsy (such as Lennox-Gastaut syndrome, juvenile myoclonic epilepsy, absence epilepsy, etc.), innumerable seizures within the 12-month period prior to study entry where the individual seizures cannot be counted, or nonepileptic seizures. - Have had status epilepticus (other than simple partial status epilepticus) within the 12 months prior to Screening. - Have had previous exposure to retigabine. - Have impaired renal function as judged by a creatinine clearance of <50 mL/min. - Have a history of substance abuse (alcohol or drugs) or substance dependence within 12 months prior to Screening. - Have taken an investigational drug, or used an investigational device, within the 30 days prior to Screening or plans to take another investigational drug at any time during the study. - Are currently following or planning to follow a ketogenic diet. - Have been treated with felbamate or vigabatrin within the 6 months prior to Screening. If a subject has been previously treated with vigabatrin >6 months prior to Screening, a visual perimetry test performed within 6 months prior to Screening must show normal visual fields or no worsening of recognised visual field abnormalities as compared with prior to vigabatrin treatment. - Are using central nervous system (CNS)-active medication (other than concomitant AED therapy), unless the subject has been stabilised on such medication for more than 1 month prior to Screening; or currently taking medications known to lower seizure threshold (e.g., antipsychotics) and monoamine oxidase (MAO) inhibitors. - Are using herbal treatments with CNS activity within 1 month prior to Screening. - Are planning surgery during the study to control seizures. - Are suffering from acute or progressive neurological disease, severe psychiatric disease, or severe mental abnormalities that are likely to interfere with the objectives of the study. - Have a history of urinary retention or risk factors for urinary retention that in the investigator's judgment could potentially affect subject safety. - Have any medical condition that, in the investigator's judgment, is considered to be clinically significant and could potentially affect subject safety or study outcome, including but not limited to: clinically significant cardiac, renal, or hepatic conditions; or a condition that affects the absorption, distribution, metabolism or excretion of drugs. - Have an average corrected QT interval (QTc; either QTcB Bazett's correction or QTcF Fridericia's correction) =450 msec or =480 msec for subjects with bundle branch block at the time of Screening. - Have active suicidal plan/intent or have had active suicidal thoughts in the past 6 months. Have a history of suicide attempt in the last 2 years or more than 1 lifetime suicide attempt. - Have a history of malignancy within the past 2 years, with the exception of basal cell carcinoma. - Have a known hypersensitivity to any components of the study medication. Randomisation Criteria: Subjects must also meet the following criteria at the end of the Baseline Phase (Visit 3) and before randomisation and administration of the first dose of study medication: - Have a documented 28-day total POS frequency rate of =4 POS over an 8 week Baseline Phase. Note: In subjects with simple partial seizures, although all seizures occurring during the Baseline Phase will be collected, only seizures with motor signs will be counted toward qualification for meeting the randomisation criteria. - Have not had a seizure-free period of =21 consecutive days during the Baseline Phase. - Have not had innumerable seizures (defined as an episode of seizure activity lasting <30 minutes during which several seizures occur with such frequency that the initiation and termination of each individual seizure cannot be distinguished) during the 8 week Baseline Phase. - Have not had an episode of status epilepticus (other than simple partial status epilepticus) during the 8 week Baseline Phase - Have not required dose adjustments of concurrent AEDs, addition of new AEDs, discontinuation of existing AEDs, changes to VNS settings, or acute use of benzodiazepines for the treatment of seizures during the Baseline Phase. |
Country | Name | City | State |
---|---|---|---|
Hong Kong | GSK Investigational Site | Hang Hau | |
Hong Kong | GSK Investigational Site | Hong Kong | |
Hong Kong | GSK Investigational Site | Kowloon | |
Hong Kong | GSK Investigational Site | Shatin | |
Korea, Republic of | GSK Investigational Site | Busan | |
Korea, Republic of | GSK Investigational Site | Busan | |
Korea, Republic of | GSK Investigational Site | Daegu | |
Korea, Republic of | GSK Investigational Site | Daegu, | |
Korea, Republic of | GSK Investigational Site | Daejeon | |
Korea, Republic of | GSK Investigational Site | Gyeonggi-do | |
Korea, Republic of | GSK Investigational Site | Gyeonggi-do | |
Korea, Republic of | GSK Investigational Site | Incheon | |
Korea, Republic of | GSK Investigational Site | Seoul | |
Korea, Republic of | GSK Investigational Site | Seoul | |
Korea, Republic of | GSK Investigational Site | Seoul | |
Korea, Republic of | GSK Investigational Site | Seoul | |
Korea, Republic of | GSK Investigational Site | Seoul | |
Korea, Republic of | GSK Investigational Site | Seoul | |
Korea, Republic of | GSK Investigational Site | Seoul | |
Korea, Republic of | GSK Investigational Site | Seoul | |
Korea, Republic of | GSK Investigational Site | Seoul | |
Malaysia | GSK Investigational Site | Kuala Lumpur | |
Malaysia | GSK Investigational Site | Seberang Jaya | |
Philippines | GSK Investigational Site | Cebu City | |
Philippines | GSK Investigational Site | Davao | |
Philippines | GSK Investigational Site | Manila | |
Singapore | GSK Investigational Site | Singapore | |
Taiwan | GSK Investigational Site | Changhua | |
Taiwan | GSK Investigational Site | Kaohsiumg | |
Taiwan | GSK Investigational Site | Kaohsiung | |
Taiwan | GSK Investigational Site | New Taipei City | |
Taiwan | GSK Investigational Site | Taichung | |
Taiwan | GSK Investigational Site | Tainan | |
Taiwan | GSK Investigational Site | Tainan | |
Taiwan | GSK Investigational Site | Taipei | |
Taiwan | GSK Investigational Site | Taipei | |
Taiwan | GSK Investigational Site | Tau-Yuan | |
Thailand | GSK Investigational Site | Bangkok | |
Thailand | GSK Investigational Site | Bangkok | |
Thailand | GSK Investigational Site | Chiang Mai | |
Thailand | GSK Investigational Site | Khon Kaen |
Lead Sponsor | Collaborator |
---|---|
GlaxoSmithKline |
Hong Kong, Korea, Republic of, Malaysia, Philippines, Singapore, Taiwan, Thailand,
Proposal for revised clinical and electroencephalographic classification of epileptic seizures. From the Commission on Classification and Terminology of the International League Against Epilepsy. Epilepsia. 1981 Aug;22(4):489-501. — View Citation
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Number of Placebo and Retigabine 900 mg Responders During the Maintenance Phase (MP) | A responder is defined as a par. with >=50% reduction in the 28 day total partial on-set seizure (POS) frequency from the Baseline Phase (BP) to the MP, randomly assigned to retigabine 900 mg/day compared with placebo. The total 28-day POS rate was defined as: (total number of POS over the evaluable period (MP) / number of days of seizure (sz) data in the evaluable period) *28 days. In the event of one or more innumerable seizures (IS) occurring on a day, these were to be counted as an additional 10 seizures for that day, regardless of the number of occurrences of IS on that day. The number of applicable days in a phase for seizure data is calculated as: the end date of MP minus start date of the MP minus days on which seizures were recorded as "Not done" + 1). Each occurrence of status epilepticus (SE) was counted as 1 seizure (whether partial or not). | Baseline (BL); Week 4 up to Week 16 | |
Secondary | Number of Placebo and Retigabine 600 mg Responders During the MP | A "responder" is defined as a participant experiencing a >=50% reduction in the 28-day total POS frequency from the BP to the MP, randomly assigned to retigabine 600 mg/day compared to placebo. The 28-day total POS frequency was calculated as: (total number of PS over the time period of interest [MP] / number of applicable days in that period) * 28. In a case of one or more occurrences of IS on a day, these seizures were to be counted as an additional 10 seizures for that day, regardless of whether the IS were PS or not, and regardless of the number of occurrences of IS on that day. The number of applicable days in a phase for seizure data is calculated as: the end date of the MP minus the start date of the MP minus days on which seizures were recorded as "Not Done" during the MP plus 1). Each occurrence of SE was counted as 1 seizure (whether partial status or not). | Baseline; Week 4 up to Week 16 | |
Secondary | Number of Responders From the BP to the Treatment Phase (TrP) | A "responder" is defined as a participant experiencing a >=50% reduction in the 28-day total POS frequency from the BP to the TrP (TiP plus MP). The 28-day total POS frequency was calculated as: (total number of PS over the time period of interest [TrP] / number of applicable days in that period) * 28. In a case of one or more occurrences of IS on a day, these seizures were to be counted as an additional 10 seizures for that day, regardless of whether the IS were PS or not, and regardless of the number of occurrences of IS on that day. The number of applicable days in a phase for seizure data is calculated as: the end date of the TrP minus the start date of the TrP minus days on which seizures were recorded as "Not Done" during the TrP plus 1). Each occurrence of SE was counted as 1 seizure (whether partial status or not). | From Baseline up to Week 16 | |
Secondary | Percent Change From Baseline in the 28-day Total POS Frequency During the MP | The 28-day total POS frequency was calculated as: (total number of PS over the time period of interest [MP] / number of applicable days in that period) * 28. In a case of one or more occurrences of IS on a day, these seizures were to be counted as an additional 10 seizures for that day, regardless of whether the IS were PS or not, and regardless of the number of occurrences of IS on that day. The number of applicable days in a phase for seizure data is calculated as: the end date of the MP minus the start date of the MP minus days on which seizures were recorded as "Not Done" during the MP plus 1. Percent change from Baseline was calculated as: ([the 28-day PS rate for the period of interest (MP) minus the Baseline 28-day PS rate] / Baseline 28-day PS rate) * 100. A negative percent change indicates a reduction (improvement) from Baseline; thus, the best possible outcome is -100% (100% reduction). There was no theoretical upper limit for worsening. | Baseline; Week 4 up to Week 16 | |
Secondary | Percent Change From Baseline in the 28-day Total POS Frequency During the TrP | The 28-day total POS frequency was calculated as: (total number of PS over the time period of interest [TrP; TiP plus MP] / number of applicable days in that period) * 28. In a case of one or more occurrences of IS on a day, these seizures were to be counted as an additional 10 seizures for that day, regardless of whether the IS were PS or not, and regardless of the number of occurrences of IS on that day. The number of applicable days in a phase for seizure data is calculated as: the end date of the TrP minus the start date of the TrP minus days on which seizures were recorded as "Not Done" during the TrP plus 1. Percent change from Baseline was calculated as: ([the 28-day PS rate for the period of interest (TrP) minus the Baseline 28-day PS rate] / Baseline 28-day PS rate) * 100. A negative percent change indicates a reduction (improvement) from Baseline; thus, the best possible outcome is -100% (100% reduction). There was no theoretical upper limit for worsening. | From Baseline up to Week 16 | |
Secondary | Percent Change From Baseline in the 28-day Total POS Frequency During the MP Categorized as: no Change/Increase, >0% to <50% Decrease, 50% to 75% Decrease, and >75% to 100% Decrease | The 28-day total POS frequency was calculated as: (total number of PS over the time period of interest [MP] / number of applicable days in that period) * 28. In a case of >=1 occurrence of IS on a day, these seizures were to be counted as an additional 10 seizures for that day, regardless of whether the IS were PS or not, and regardless of the number of occurrences of IS on that day. The number of applicable days in a phase for seizure data is calculated as: the end date of the MP minus the start date of the MP minus days on which seizures were recorded as "Not Done" during the MP plus 1. Percent change from Baseline was calculated as: ([the 28-day PS rate for the period of interest (MP) minus the Baseline 28-day PS rate] / Baseline 28-day PS rate) * 100. A negative percent change indicates a reduction (improvement) from Baseline. There was no theoretical upper limit for worsening. Each occurrence of status epilepticus (SE) was counted as 1 seizure (whether partial status or not). | Baseline; Week 4 up to Week 16 | |
Secondary | Percent Change From Baseline in 28 Day Total POS Frequency During the TrP Categorized as: no Change/Increase, >0% to <50% Decrease, 50% to 75% Decrease, and >75% to 100% Decrease | The 28-day total POS frequency was calculated as: (total number of PS over the time period of interest [TrP; TiP plus MP] / number of applicable days in that period) * 28. In a case of one or more occurrences of IS on a day, these seizures were to be counted as an additional 10 seizures for that day, regardless of whether the IS were PS or not, and regardless of the number of occurrences of IS on that day. The number of applicable days in a phase for seizure data is calculated as: the end date of the TrP minus the start date of the TrP minus days on which seizures were recorded as "Not Done" during the TrP plus 1. Percent change from Baseline was calculated as: ([the 28-day PS rate for the period of interest (TrP) minus the Baseline 28-day PS rate] / Baseline 28-day PS rate) * 100. A negative percent change indicates a reduction (improvement) from Baseline; thus, the best possible outcome is -100% (100% reduction). There was no theoretical upper limit for worsening. | From Baseline up to Week 16 | |
Secondary | Percent Change From Baseline in the 28-day Total POS Frequency During the MP Categorized as: >25% Increase and 0% to 25% Increase | The 28-day total POS frequency was calculated as: (total number of PS over the time period of interest [MP] / number of applicable days in that period) * 28. In a case of one or more occurrences of IS on a day, these seizures were to be counted as an additional 10 seizures for that day, regardless of whether the IS were PS or not, and regardless of the number of occurrences of IS on that day. The number of applicable days in a phase for seizure data is calculated as: the end date of the MP minus the start date of the MP minus days on which seizures were recorded as "Not Done" during the MP plus 1. Percent change from Baseline was calculated as: ([the 28-day PS rate for the period of interest (MP) minus the Baseline 28-day PS rate] / Baseline 28-day PS rate) * 100. A negative percent change indicates a reduction (improvement) from Baseline; thus, the best possible outcome is -100% (100% reduction). There was no theoretical upper limit for worsening. | Baseline; Week 4 up to Week 16 | |
Secondary | Percent Change From Baseline in the 28-day Total POS Frequency During the TrP Categorized as: >25% Increase and 0% to 25% Increase | The 28-day total POS frequency was calculated as: (total number of PS over the time period of interest [TrP; TiP plus MP] / number of applicable days in that period) * 28. In a case of one or more occurrences of IS on a day, these seizures were to be counted as an additional 10 seizures for that day, regardless of whether the IS were PS or not, and regardless of the number of occurrences of IS on that day. The number of applicable days in a phase for seizure data is calculated as: the end date of the TrP minus the start date of the TrP minus days on which seizures were recorded as "Not Done" during the TrP plus 1. Percent change from Baseline was calculated as: ([the 28-day PS rate for the period of interest (TrP) minus the Baseline 28-day PS rate] / Baseline 28-day PS rate) * 100. A negative percent change indicates a reduction (improvement) from Baseline; thus, the best possible outcome is -100% (100% reduction). There was no theoretical upper limit for worsening. | From Baseline up to Week 16 | |
Secondary | Number of Participants Who Were Seizure Free During the MP, ITT Population | A seizure free-day is defined as a day with non-missing seizure data but without any seizures. A participant was considered to be seizure free during the MP if he/she had no record of countable seizures of any type, no IS, and no SE during the MP. Participants who had one or more days on which they recorded seizures as "Not Done" on the seizure calendar were not disqualified from being considered as seizure free for that day. Participants who did not complete the study or experienced any seizures in the MP were not considered to be seizure free. A participant who completed the study AND had no seizures during the maintenance phase were counted to be seizure free. Also, a completer who only had seizures during the TiP is considered seizure free. | Baseline; Week 4 up to Week 16 | |
Secondary | Number of Participants Who Were Seizure Free During the TrP | A seizure free-day is defined as a day with non-missing seizure data but without any seizures. A participant was considered to be seizure free during the TrP if he/she had no record of countable seizures of any type, no IS, and no SE during the TrP. Participants who had one or more days on which they recorded seizures as "Not Done" on the seizure calendar were not disqualified from being considered as seizure free for that day. A participant was considered to be seizure free if they experienced no seizures in the TiP or MP regardless of how long they were in the study. | From Baseline up to Week 16 | |
Secondary | Percentage of Seizure-free Days in the MP | The percentage of seizure-free days was calculated as: (total number of days without seizures in the MP / number of applicable days in the MP) * 100. A seizure-free day is defined as a day with non-missing seizure data but without any seizures. A participant was considered to be seizure free during the MP if he/she had no record of countable seizures of any type, no IS, and no SE during the MP. Participants who had one or more days on which they recorded seizures as "Not Done" on the seizure calendar were not disqualified from being considered as seizure free for that day. | From Week 4 up to Week 16 | |
Secondary | Percentage of Seizure-free Days in the TrP | The percentage of seizure-free days was calculated as: (total number of days without seizures in the TrP (TiP plus MP) / number of applicable days in the TrP) * 100. A seizure-free day is defined as a day with non-missing seizure data but without any seizures. A participant was considered to be seizure free during the TrP if he/she had no record of countable seizures of any type, no IS, and no SE during the TrP. Participants who had one or more days on which they recorded seizures as "Not Done" on the seizure calendar were not disqualified from being considered as seizure free for that day. | From Baseline up to Week 16 | |
Secondary | Incidence of New Seizure Types During the TrP in Participants Without a History of the Indicated Seizure Types at Baseline | A participant was considered to have new seizure types during the TrP if they experienced a new seizure types (such as SE, myoclonic, absence, secondary generalization) and had no prior history of these seizure types. At Screening, a history of previous seizure types was collected, with "Yes," "No," "IS," "SE," or "Unknown" being recorded for each of the seizures types. The history of seizure types was updated during the 8-week BP as pre-treatment status. New types of seizures during the TrP were recorded as A1=simple PS with motor signs; AX=simple PS without motor signs; B=complex PS; C=PS evolving to secondary generalized seizures; D1=absence of seizures; D2=myoclonic seizures; D3=clonic seizures; D4=tonic seizures; D5=tonic-clonic seizures; D6=atonic seizures; E=unclassified seizures; and SE=status epilepticus. | From Baseline up to Week 16 |
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