A Real-World Medical Chart Review of Spinal Muscular Atrophy Patients Treated With Onasemnogene Abeparvovec in Saudi Arabia (SMA-REAL)

OA Cohort

Patients with SMA type 1 who were treated with OA.

Proportion of SMA Type 1 Non-Sitters Patients Achieving Independent Sitting for ≥30 Seconds at Any Visit up to 12 Months After OA Administration

Children's Hospital of Philadelphia Infant Test of Neuromuscular Disorders (CHOP-INTEND) Score

CHOP-INTEND is a validated motor function assessment for infants with SMA. The total score ranges from 0 to 64, with higher scores indicating better motor function. Scores are derived from 16 items assessing spontaneous movement, strength, and motor abilities. An increase in score reflects improvement in motor function.

Change From Baseline in CHOP-INTEND Score

CHOP-INTEND is a validated motor function assessment for infants with SMA. The total score ranges from 0 to 64, with higher scores indicating better motor function. Scores are derived from 16 items assessing spontaneous movement, strength, and motor abilities. An increase in score reflects improvement in motor function.

Hammersmith Infant Neurological Examination-Section 2 (HINE-2, Motor Milestones) Score

The HINE-2 is a motor milestone assessment evaluating developmental abilities in infants. The total score ranges from 0 to 26, with higher scores indicating greater achievement of motor milestones. The scale assesses milestones such as head control, sitting, rolling, crawling, standing, and walking. Higher scores correspond to more advanced motor development.

Change From Baseline in HINE-2 Score

The HINE-2 is a motor milestone assessment evaluating developmental abilities in infants. The total score ranges from 0 to 26, with higher scores indicating greater achievement of motor milestones. The scale assesses milestones such as head control, sitting, rolling, crawling, standing, and walking. Higher scores correspond to more advanced motor development.

Percentage of Patients who Maintain the Ability to Thrive at 12 Months After OA Treatment

Ability to thrive is defined as meeting the following criteria:

• Ability to tolerate thin liquids, as demonstrated by a formal swallowing assessment, with tested consistency classified as "very thin" or "thin" and results recorded as "normal swallow," "functional swallow," or "safe for swallowing";
• No requirement for nutritional support via mechanical feeding methods (e.g., feeding tube);
• Maintenance of body weight at or above the 3rd percentile for age and sex, according to World Health Organization (WHO) child growth standards, appropriate for the child's age at assessment.

Number and Percentage of Patients Without Permanent Ventilatory Support or Death After OA Administration

Event-free survival of patients without permanent ventilatory support or death after OA administration.

Permanent ventilatory support is defined as the requirement for either:

• Tracheostomy, or
• ≥16 hours per day of respiratory support (including non-invasive ventilation) for 14 or more consecutive days, in the absence of an acute reversible illness and excluding perioperative ventilation.

Number and Percentage of Patients With Adverse Events

Number and Percentage of Patients by Demographic and Clinical Characteristics

Demographic and clinical characteristics include:

• Sex
• City of residence
• Preterm birth status
• Functional classification
• Developmental milestones achieved prior to treatment initiation
• SMA-related symptoms
• Comorbidities
• CHOP-INTEND Score
• HINE-2 Score
• Ambulatory status
• Swallowing assessment result
• Feeding method
• Anthropometric measures

Age

Age, gestational age at birth, age at symptom onset, and age at SMA type 1 diagnosis.

Duration Between Symptom Onset and Diagnosis