Phase 3 Study to Evaluate Efficacy of Amifampridine Phosphate in Lambert-Eaton Myasthenic Syndrome (LEMS)

Phase 3

Completed

Conditions: Lambert-Eaton Myasthenic Syndrome

Interventions: Drug: Amifampridine Phosphate
Drug: Placebo Oral Tablet

Registration Number: NCT02970162

Lead Sponsor: Catalyst Pharmaceuticals, Inc.

Brief Summary: This study evaluates the effect of withdrawing amifampridine phosphate treatment from patients with LEMS. One half of the patients will continue to receive amifampridine phosphate and the other half will receive placebo, during this double-blind study.

Detailed Description: This was a randomized (1:1), double-blind, placebo-controlled, parallel-group, withdrawal study designed to evaluate the efficacy and safety of amifampridine phosphate in patients diagnosed with LEMS. The study was planned to include approximately 28 male and female patients.

Prior to the study, patients were receiving unblinded treatment in the expanded access program (EAP-001). Patients had to be on a stable dose and frequency of amifampridine phosphate for at least 1 week prior to randomization into LMS-003. Screening and randomization (Day 0) may have been into a single visit.

Patients who met eligibility criteria were randomized 1:1 to amifampridine phosphate (at the patient's optimal dose) or placebo on Day 0.

Baseline assessments were obtained on Study Day 0, while the patient has been on open-label amifampridine phosphate and in relationship to the usual dosing schedule. Patients took blinded study medication on Day 1 through Day 3. On Day 4, a dose of blinded study medication was administered by the site study personnel. This was the same medication that the patient took on Day 1 through Day 3. The assessments listed below were performed following either the second, third, or fourth dose of medication taken on Day 4, and this should be the same dose after which Day 0 assessments were performed. For example, if the patient took their second dose of amifampridine in the clinic on Day 0 and had assessments started 40 minutes later, then on Day 4, that patient should be assessed after taking their second dose of investigational product (IP).

Beginning with the next dose after all Day 0 baseline assessments were completed, the patient received IP through Day 4, with a clinic visit on the last day (Day 4) for assessments.

The planned duration of participation for each patient was up to 12 days, including screening (up to 7 days), Day 0 assessments and randomization, and IP administration (Day 1 through Day 4).

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 26

Inclusion Criteria

Male or female ≥18 years of age and currently receiving amifampridine phosphate for LEMS.
Diagnosis of LEMS by antibody testing or electromyography (EMG).
Completion of anti-cancer treatment at least 3 months (90 days) prior to Screening.
If receiving peripherally acting cholinesterase inhibitors (e.g. pyridostigmine), a stable dose of cholinesterase inhibitors is required for at least 7 days prior to randomization and throughout the study.
If receiving permitted oral immunosuppressants (prednisone or other corticosteroid), a stable dose is required for at least 30 days prior to randomization and throughout the study.
Female patients of childbearing potential must practice an effective, reliable contraceptive regimen during the study.
Able to perform all study procedures and assessments.
Willing and able to travel to study site and attend all clinic study visits.
Willing and able to provide written informed consent.

Exclusion Criteria

Clinically significant long corrected QT (QTc) interval on ECG in previous 12 months.
Seizure disorder.
Active brain metastases.
Unable to ambulate.
Pregnant or lactating females.
Any other condition which, in the opinion of the Investigator, might interfere with the patient's participation in the study or confound the assessment of the patient.

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
amifampridine phosphate	Amifampridine Phosphate	amifampridine phosphate 10 mg (amifampridine equivalent) by mouth, 30 to 80 mg total daily dose, 3 to 4 times per day for 4 days
placebo (for amifampridine phosphate)	Placebo Oral Tablet	placebo by mouth 3 to 4 times per day for 4 days

Primary Outcome Measures

Name	Time	Method
Quantitative Myasthenia Gravis (QMG) Score	change from baseline in QMG score at end of day 4	The QMG is a physician-rated test including 13 assessments such as facial strength, swallowing, grip strength, and duration of time that limbs can be maintained in outstretched positions. Each assessment is graded as 0 (none), 1 (mild), 2 (moderate), or 3 (severe), for a total range of 0-39. A higher total score indicates a worse outcome.
Subject Global Impression (SGI) Score	change from baseline in SGI score at end of day 4	The SGI is a 7-point scale on which the patient rates their global impression of the effects of a study treatment (1=terrible to 7=delighted). The SGI was assessed by the patient or the patient's parent/guardian/caregiver if the patient was unable to complete the SGI. The SGI has demonstrated concordance with the physician's assessment of improvement.

Secondary Outcome Measures

Name	Time	Method
Change in Clinician's Global Impression of Improvement (CGI-I) at Day 4 Compared to Baseline	change from baseline in CGI-I score at end of day 4	The CGI-I captures the Investigator's global impression of the patient's improvement or worsening from baseline status. The 7-point scale is scored by the Investigator based on changes in symptoms, behavior, and functional abilities. Each symptom is 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). The total score can range from 0 to 49. A higher score indicates a worse outcome.