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Botulinum toxin A

Phase 3

Spasticity, Post-Stroke | Small molecule | Neurology |GSK plc|Last Updated: Jun 2, 2020

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindACTIVE_CONTROLLEDBiomarker
Total Trials1
Total Enrollment124
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT03261167A Phase III Study to Evaluate the Efficacy and Safety of GSK1358820 in Subjects With Post-stroke Upper Limb SpasticityPHASE3 COMPLETED 124Aug 2, 2017Jan 10, 2019Jun 2, 202038 Japan
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Study Endpoints
Primary Endpoints
Percentage of Participants Who Had Modified Ashworth Scale (MAS) Score Reduced at Least 1 From Baseline in the Elbow Flexors at Week 6
Week 6

MAS was used to measure the level of spasticity. The test was performed in a sitting position throughout the study. The affected parts were extended as fast as possible to grade the flexor muscle tones. It was scored on a scale of 0 to 4 as: 0=No increase in muscle tone, 1=Slight increase in muscle tone, manifested by a catch and release or by minimal resistance at the end of the range of motion (ROM) when the affected part(s) is moved in flexion or extension, 1+= Slight increase in muscle tone, manifested by a catch, followed by minimal resistance throughout the remainder (less than half of ROM, 2 =More marked increase in muscle tone through most of the ROM, but affected part(s) easily moved, 3= Considerable increase in muscle tone, passive movement difficult and 4= Affected part(s) rigid in flexion or extension. Higher scores= Worst outcome while lower scores= Better outcome.

Secondary Endpoints
Percentage of Participants Who Had MAS Score Reduction in Elbow, Wrist, Finger and Thumb Flexors up to Week 12
Week 2, Week 4, Week 6 and Week 12
Change From Baseline in MAS Scores in Elbow, Wrist, Finger and Thumb Flexors up to Week 12 (Mixed Model Repeated Measures [MMRM])
Baseline (Day 1), Week 2, Week 4, Week 6 and Week 12
Change From Baseline in Principal Therapeutic Target of Disability Assessment Scale (DAS) - MMRM up to Week 12
Baseline (Day 1), Week 2, Week 4, Week 6 and Week 12
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Study Design & Arms
AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Part 1: Subjects receiving 400 units of botulinum toxin AEXPERIMENTALSubjects will receive a total dose of 400 units of botulinum toxin A of which 240 units will be injected into the muscles that act on finger (including thumb flexors) and wrist flexors, and a total of 160 units will be injected into the muscles that act on the elbow flexors.
Part 1: Subjects receiving 240 units of botulinum toxin AACTIVE_COMPARATORSubjects will receive 240 units of botulinum toxin A injected into the muscles that act on the finger (including thumb flexors) and wrist flexors. Placebo will be injected into the muscles that act on the elbow flexors.
Part 2,3,4: Subjects receiving 400 units of botulinum toxin AEXPERIMENTALSubjects will receive botulinum toxin A with a dose of 400 units injected in a divided doses.
Interventions
NameTypeDescription
Botulinum toxin A (GSK1358820)DRUGGSK1358820 is sterile, purified type A botulinum neurotoxin complex. GSK1358820 injection will contain botulinum toxin A (100 units), sodium chloride (0.9 milligrams \[mg\]), and human serum albumin (0.5 mg). It will be available with doses of 400 units and 240 units.
PlaceboDRUGPlacebo injection will contain sodium chloride (0.9 mg).
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Eligibility Criteria
Age Range20 Years — 80 Years
SexALL
Healthy VolunteersNo
Study Sites38

Inclusion Criteria: * For screening phase (Day -28 to Day -1): Between 20 and 80 years of age at the time of informed consent (ICF). * Subjects with at least a 3-month history of upper limb spasticity after the most recent stroke. * Subjects who have spastic symptoms in the finger (including the th...

Countries:Japan
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