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A Phase 3 Study of Amifampridine Phosphate in Patients With Lambert Eaton Myasthenic Syndrome (LEMS)

This study has been completed.
Information provided by (Responsible Party):
Catalyst Pharmaceuticals, Inc. Identifier:
First received: June 17, 2011
Last updated: July 26, 2016
Last verified: July 2016
A Phase 3 study to evaluate the efficacy and safety of Amifampridine Phosphate in patients with Lambert-Eaton Myasthenic Syndrome (LEMS).

Condition Intervention Phase
Lambert Eaton Myasthenic Syndrome Drug: Amifampridine Phosphate Drug: Placebo Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Treatment
Official Title: A Phase 3, Double-blind, Placebo-controlled, Randomized Discontinuation Study Followed by Open-label Extension Evaluating Efficacy and Safety of Amifampridine Phosphate in Patients With Lambert-Eaton Myasthenic Syndrome (LEMS)

Resource links provided by NLM:

Further study details as provided by Catalyst Pharmaceuticals, Inc.:

Primary Outcome Measures:
  • Change from Baseline Quantitative Myasthenia Gravis (QMG)at 14 days [ Time Frame: Assessment at Baseline, Day 8, and Day 14 ]
  • Change in SGI score [ Time Frame: Assessment at Baseline, Days 8 & 14 ]
    Subject Global Impression (SGI) is a measure of changes in subject's perception of change in overall wellbeing

Secondary Outcome Measures:
  • Change from Baseline Timed 25 Foot Walking Test (T25FW)at 14 days [ Time Frame: Assessment at Baseline, Day 8, and Day 14 ]
  • Change in CGI-I score [ Time Frame: Baseline, Days 8 & 14 ]
    Investigator perceived global improvement or change

Enrollment: 38
Study Start Date: June 2011
Study Completion Date: June 2016
Primary Completion Date: September 2014 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Placebo Comparator: Placebo
Matching placebo tablets administered 3-4 times a day over 2 weeks.
Drug: Placebo
Matching number of tablets to the individual patient's tablet count of active at baseline.
Experimental: Amifampridine Phosphate
Matching amifampridine phosphate tablets, 10 mg, administered 3-4 times a day for 2 weeks.
Drug: Amifampridine Phosphate
30-80 mg given 3-4 times per day with a maximum single dose of 20 mg (2 x 10 mg tablets).
Other Names:
  • 3,4-diaminopyridine phosphate
  • 3,4-DAP phosphate

Detailed Description:
This multicenter, double-blind, placebo-controlled, randomized (1:1) discontinuation study is a 4 part study designed to evaluate the efficacy and safety of multiple dose administration of amifampridine phosphate in patients with LEMS.

Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria: Individuals eligible to participate in this study must meet all of the following inclusion criteria:

  • ≥18 years of age
  • Confirmed diagnosis of LEMS
  • Normal respiratory function
  • Normal swallowing function
  • If receiving peripherally acting cholinesterase inhibitors a stable dose is required for at least 7 days prior to Screening.
  • If receiving oral immunosuppressants a stable dose is required for at least 90 days prior to Screening.
  • Negative pregnancy test for females of childbearing potential
  • If sexually active, willing to use 2 acceptable methods of contraception
  • Willing to perform all study procedures as physically possible.
  • Willing and able to provide written informed consent after the nature of the study has been explained and prior to the start of any research-related procedures.

Exclusion Criteria: Individuals who meet any of the following exclusion criteria are not eligible to participate in the study:

  • History of epilepsy or seizure.
  • Known active brain metastasis.
  • Use of Fampridine (4-aminopyridine), and any form of 3,4-diaminopyridine other than the IP provided, such as amifampridine base or Firdapse, during the study.
  • Use of medications known to lower the epileptic threshold within 7 days or 5 half-lives.
  • Use of medications which inhibit neuromuscular junction function within 7 days or 5 half-lives.
  • Use of IVIG, plasmapheresis (plasma exchange), or immunoadsorption within 90 days
  • Use of guanidine hydrochloride within 7 days
  • Use of rituximab within 12 months
  • History of drug allergy to any pyridine-containing substances or any amifampridine phosphate excipient(s).
  • Use of any other investigational productwithin 30 days
  • Treatment with a concomitant medication that prolongs the QT/QTc interval within 7 days or 5 half-lives.
  • Treatment with sultopride (4-amino-N-[(1-ethylpyrrolidin-2-yl)methyl]-5-ethylsulfonyl-2-methoxybenzamide) within 7 days.
  • An abnormal electrocardiogram (ECG).
  • Documented history of arrhythmias.
  • History of additional risk factors for torsade de pointes.
  • Breastfeeding or pregnant or planning to become pregnant (self or partner) at any time during the study.
  • Likely or expected to require treatment for cancer within 3 months (90 days) after entering.
  • History of severe renal impairment or evidence of severe renal impairment
  • Any condition that places the patient at high risk of poor treatment compliance or of not completing the study.
  • History of uncontrolled asthma.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01377922

United States, Alabama
Birmingham, Alabama, United States, 35233
United States, Arizona
Scottsdale, Arizona, United States, 85258
United States, California
Los Angeles, California, United States, 90095
Palo Alto, California, United States, 94305
United States, Kansas
Kansas City, Kansas, United States, 66160
United States, New York
New York, New York, United States, 10032
Lyon, France, 69677
Munich, Bavaria, Germany, D-80336
Berlin, Germany, D-10117
Pecs, Hungary, H-7623
Warsaw, Poland, 02 097
Russian Federation
Moscow, Russian Federation, 125367
Belgrade, Serbia, 11000
Madrid, Spain, 28007
Sponsors and Collaborators
Catalyst Pharmaceuticals, Inc.
Study Director: Charles W Gorodetzky, MD, PhD Chief Medical Officer
  More Information

Responsible Party: Catalyst Pharmaceuticals, Inc. Identifier: NCT01377922     History of Changes
Other Study ID Numbers: LMS-002
Study First Received: June 17, 2011
Last Updated: July 26, 2016
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

Additional relevant MeSH terms:
Lambert-Eaton Myasthenic Syndrome
Paraneoplastic Syndromes, Nervous System
Paraneoplastic Syndromes
Pathologic Processes
Nervous System Neoplasms
Neoplasms by Site
Autoimmune Diseases of the Nervous System
Nervous System Diseases
Neurodegenerative Diseases
Neuromuscular Junction Diseases
Neuromuscular Diseases
Autoimmune Diseases
Immune System Diseases
Potassium Channel Blockers
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action processed this record on September 21, 2017