Long-term Follow-up of Patients With Spinal Muscular Atrophy Treated With OAV101 in Clinical Trials

The study is comprised of a Baseline Visit and 2 Follow-up Periods. For Follow-up Periods 1 and 2, which includes Baseline through Year 5 visits, assessments will be performed at the Investigational site. For the first 2 years (Follow-up Period 1), visits will occur every 6 months. For Years 3 to 5 (Follow-up Period 2) follow-up visits will be conducted annually. All patients will enter the study at the baseline visit and continue for 5 years.

Primary Outcome Measures

1. Number of participants with treatment-emergent serious adverse events (SAEs)
   An SAE is defined as any adverse event \[appearance of (or worsening of any pre-existing)\] undesirable sign(s), symptom(s), or medical conditions(s) which meets any one of the following criteria: * fatal * life-threatening * results in persistent or significant disability/incapacity * constitutes a congenital anomaly/birth defect, fetal death or congenital abnormality or birth defect * requires in-patient hospitalization or prolongation of existing hospitalization, unless hospitalization is for routine treatment or monitoring of the studied indication, not associated with any deterioration in condition * is medically significant, e.g. defined as an event that jeopardizes the participant or may require medical or surgical intervention to prevent one of the outcomes listed above
2. Number of participants with treatment emergent Adverse Events of Special Interest (AESI)
   The following are important identified and important potential risks (AESI) associated with OAV101: Hepatotoxicity, Transient Thrombocytopenia, Cardiac adverse events, Sensory abnormalities suggestive of ganglionopathy, and Thrombotic microangiopathy. These will be assessed by the investigator.

Secondary Outcome Measures

1. The number of participants demonstrating each developmental milestone according to the Developmental Milestone Checklist
   The Developmental Milestone Checklist is a sponsor created list of items using relevant definitions obtained from World Health Organization Multicentre Growth Reference Study (WHO-MGRS). These will be assessed via the milestone checklist, formed of 6 yes/no questions. The developmental milestones are: sitting with support, hands-and-knees crawling, standing with assistance, walking with assistance, standing alone and walking alone. A yes response indicates that the patient reached a particular development milestone.
2. The number of participants demonstrating maintenance of each developmental milestone according to the Developmental Milestone Checklist
   The Developmental Milestone Checklist is a sponsor created list of items using relevant definitions obtained from World Health Organization Multicentre Growth Reference Study (WHO-MGRS). These will be assessed via the milestone checklist, formed of 6 yes/no questions. The developmental milestones are: sitting with support, hands-and-knees crawling, standing with assistance, walking with assistance, standing alone and walking alone. A yes response indicates that the patient reached a particular development milestone.
3. Change from Baseline in the Hammersmith Functional Motor Scale - Expanded (HFMSE) total score
   The HFMSE is a validated SMA specific assessment devised for use in children with SMA to give objective information on motor ability and clinical progression. The HFMSE contains 33 items rated from 0 (unable to perform) to 2 (performs without modification/adaptation/compensation). Total scores range from 0-66. Higher scores indicate higher levels of motor ability.
4. Change from Baseline in the Revised Upper Limb Module (RULM) total score
   The RULM is a validated SMA specific assessment of motor performance in the upper limbs from childhood through adulthood in ambulatory and non-ambulatory individuals with SMA. The scale consists of 19 scorable items: 18 items scored on 0 (unable) to 2 (full achievement) scale, and one item that is scored from 0 (unable) to 1 (able). Total scores range from 0-37 points. Higher scores reflect higher level of motor ability.
5. Systolic and diastolic blood pressure (mmHg)
6. Number of patients with potentialy clinically significant vital sign findings - Respiratory Rate (breaths/min)
7. Number of patients with potentialy clinically significant vital sign findings -Pulse Rate (beats/min)
8. Number of patients with potentialy clinically significant vital sign findings -Temperature (Degrees Celsius)
9. Number of patients with potentialy clinically significant vital sign findings -Oxygen saturation level (%).
   Oxygen saturation is the fraction of oxygen-saturated hemoglobin relative to total hemoglobin (unsaturated+saturated) in the blood and then multiplied by 100.