HEALEY ALS Platform Trial - Regimen F ABBV-CLS-7262

Change in disease severity as measured by the ALS Functional Rating Scale-Revised (ALSFRS-R) total score using a Bayesian repeated measures model that accounts for loss to follow-up due to mortality. Each of 12 questions assessing distinct functional ability is scored from 4(normal) to 0 (no ability), with a maximum total score of 48 and a minimum total score of 0. Participants with higher scores have more physical function. Note that only participants who survived to their Week 24 visit contribute to the estimate.

Mortality is defined as death or death equivalent. A participant is determined to meet the criteria of death equivalent if permanent assisted ventilation (PAV) is used for more than 22 hours per day for more than seven days in a row. The rate of mortality was estimated from a Bayesian shared-parametric model that assumed exponentially distributed survival times.

Change from baseline to Week 24 in function as assessed by ALSFRS-R total score.

Change in respiratory function over time as measured by Slow Vital Capacity (SVC).

Change in upper limb muscle strength over time as measured isometrically using hand-held dynamometry and grip strength, calculated as the average percent change from baseline of the following muscles/maneuvers: shoulder flexion, elbow flexion, elbow extension, wrist extension, abductor pollicis brevis contraction, abductor digiti minimi contraction, first dorsal interosseous contraction, and grip strength. Note that only those with measurable strength at baseline were included.

Change in log-transformed serum neurofilament light protein (NfL) concentration from baseline to Week 24.

Change from baseline to Week 24 in the activities of daily living (ADL)/independence domain score as assessed by the Amyotrophic Lateral Sclerosis Assessment Questionnaire-40 (ALSAQ-40). The ALSAQ-40, a patient-self reported outcome, consists of 40 questions that are used to measure the subjective well-being of participants, and each question is scored from 0 (never) to 5 (always or cannot do at all). The ADL/independence domain score is based on 10 out of the 40 questions, with a maximum ADL/independence domain score of 50 and minimum score of 0. Higher domain scores indicate a worse subjective well-being or less independence completing ADLs.

The number of participants who died or met the criterion for a death equivalent from the date of their baseline visit to the end of the Week 24visit window (generally 175 days after baseline). The death equivalent criterion is use of permanent assisted ventilation (PAV) for more than 22 hours per day for more than 7 days in a row.