A Randomized, Double-Blind, Placebo Controlled, Fixed Dose-Ranging Study to Assess the Safety, Tolerability, and Efficacy of Topiramate Oral Liquid and Sprinkle Formulations as an Adjunct to Concurrent Anticonvulsant Therapy for Infants (1-24 Months of Age, Inclusive) With Refractory Partial-Onset Seizures, With Open-Label Extension - Topiramate Infant Partial Onset Epilepsy

Conditions: Partial Onset Epilepsy and other Seizures

Registration Number: EUCTR2005-001338-33-CZ

Lead Sponsor: Janssen-Cilag International N.V.

Brief Summary: Not available

Detailed Description: Not available

Recruitment & Eligibility

Status: ot Recruiting

Sex: All

Target Recruitment: 240

Inclusion Criteria

• Subjects must be male or female infants between 1 and 24 months of age,
inclusive, at screening.
• Subjects must be at least 41 weeks of gestational age at screening.
• Subjects must be receiving regular enteral feeding (solid food; bottle- or
cup-fed; or using gastrostomy, jejunostomy, or nasogastric tube), with or
without breast-feeding.
• Subjects must weigh =3.5 kg and <15.5 kg at screening; length using an
infant measuring table (heel to crown) must be =49 cm. There must be
evidence of continued weight and height gain prior to the first day of
screening.
• Parents (or their legally-acceptable representatives) of subjects must have
signed an informed consent/permission document indicating that they
understand the purpose of and procedures required for the study and are
willing to give permission for their child to participate in the study.
• Subjects must have clinical or EEG evidence of POS (simple or complex),
with or without secondary generalization, at least 1 month prior to the first
day of screening in subjects >6 months of age, or at least 2 weeks prior to the
first day of screening in subjects =6 months of age. Subjects may have
multiple seizure types as long as POS is present. Acceptable evidence of POS
includes 1 of the following:
– Documented recurrent clinical seizures with asymmetric motor features or
characteristic behavioral alterations. The interictal EEGs may be negative
or inconclusive, provided that the clinical criterion for POS is met.
– A routine EEG or vEEG showing focal or asymmetric EEG findings
(epileptiform discharges, focal slowing, focal attenuation, or a
combination), with or without secondary generalization. Clinical seizures
with symmetric or behavioral features are acceptable in the presence of
EEG evidence of an asymmetric origin.
• Subjects must have been receiving at least 1 concurrent marketed AED for
=1 month for subjects >6 months of age and for >2 weeks for subjects
=6 months of age; for subjects entering the double-blind treatment phase, this
regimen must remain unchanged throughout the screening and double-blind
treatment phases with the exception of dosage reduction for non-study AEDs
because of elevated AED levels or side effects, made at the discretion of the
investigator.
• As documented on the worksheet for inadequacy of current epilepsy
treatment, the regimen of AEDs at entry:
– Must be considered to be optimized (including, if clinically appropriate,
recent demonstration of adequate blood levels) in the opinion of the
investigator
– Must be considered inadequate in controlling seizures in the opinion of the
investigator, as shown in part by a retrospective history of at least
1 seizure in the 4 weeks prior to the first day of screening
– For subjects entering the double-blind treatment phase, must have been
unchanged for at least 5 half-lives prior to the first day of screening, as
described in Section 8.1 and Attachment 2
• Caregivers (parents or their legally-acceptable representatives) of the subjects
must be able to accurately maintain the subject take-home record, including
items of general health.
• Subjects must have had a computed tomography (CT) or magnetic resonance
imaging (MRI) scan to confirm the absence of a progressive lesion, such as a
tumor, with the exception of lesions of tuberous sclerosis and Sturge-Weber
syndrome, which are allowed.
• Subjects must have an ECG at screening with no abnormal, clinically
significant” interpretations by the central reader.
Subjec

Exclusion Criteria

• Infants who are exclusively breast-fed and cannot take oral liquid medication
• Subjects with a surgically implanted and functioning vagus nerve stimulator
• Subjects with a history of febrile seizures or seizures due to an acute medical
illness within 2 weeks prior to the first day of screening
• Subjects with a history of infantile seizures as a result of a correctable
medical condition, such as metabolic disturbance, toxic exposure, neoplasm,
or active infection within 2 weeks prior to the first day of screening
• Subjects with a history of nonepileptic seizures within 2 weeks prior to the
first day of screening
• Subjects who have had epilepsy surgery within 3 months prior to the first day
of screening
• Subjects with any progressive neurologic disorder, including malignancy,
brain tumor, active central nervous system infection, demyelinating disease,
or degenerative or progressive central nervous system disease, with the
exception of tuberous sclerosis and Sturge Weber syndrome
• Subjects with any clinically significant uncontrolled medical illness,
including hepatic or renal failure, ischemic cardiac disease, malignancy, or
any disorder that, in the opinion of the investigator, places the subject at risk
through participation in a clinical study
• Subjects with nephrocalcinosis, renal stones of any type, or hydronephrosis,
as evidenced by medical history or screening examination
• Subjects with congenital glaucoma, abnormal slit-lamp examination
(if previously performed), or known ocular deficits, or subjects receiving any
ocular medications except lubricating eye drops or topical antibiotics
• Subjects with a known history of central hyperthermia, dysautonomia, or
other disturbances of autonomic function
• Subjects with a known history of inborn errors of metabolism, mitochondrial
dysfunction, or prior evidence of hyperammonemia
• Subjects with any clinically significant abnormality in laboratory tests at
screening, including but not limited to:
– White blood cell (WBC) count <3,000/mL or absolute neutrophil count
<1,000 /mL in the last 6 months for infants >6 months of age or at any
time for those =6 months of age
– AST or ALT, =2 times the ULN
– Total bilirubin =1.5 mg/dL or conjugated bilirubin =0.6 mg/dL
– Venous ammonia =2 times the ULN
– Creatinine clearance <70 mL/min per 1.73 m3 for infants =1 month to
<6 months of age or <90 mL/min per 1.73 m3 for infants =6 months to
<2 years of age; creatinine clearance at screening should be estimated
using the Schwartz formula
• Subjects who have CO2 levels <18 mmol/L, have a diagnosis of metabolic
acidosis, or are on alkali therapy
• Subjects being treated with furosemide, hydrochlorothiazide, vigabatrin,
injectable vitamin B6 therapy for pyridoxine-dependent epilepsy, monoamine
oxidase (A or B) inhibitors, felbamate, zonisamide, or any other medication
that is a potent carbonic anhydrase inhibitor (e.g., acetazolamide). Past
treatment with furosemide for more than 2 weeks must be discussed with the
sponsor
• Subjects who have been treated with an investigational drug within 2 weeks
prior to the first day of screening
• Subjects who have previously used topiramate or who have participated in a
topiramate clinical study within 1 month prior to the first day of screening
• Subjects with a known allergy or hypersensitivity to topiramate sprinkle
capsules or any of the ingredients of the oral liquid formulation or placebo
formulations
• Subjects on a ketogenic diet to control epilep