Longitudinal outcomes in Noonan syndrome

Area of Science:

• Genetics and developmental pediatrics
• Natural history studies of rare genetic disorders

Background:

• Noonan syndrome (NS) and related disorders affect ~1:1000 individuals, presenting multisystemic challenges.
• Prior natural history studies predate comprehensive genetic confirmation, limiting current understanding.
• Updated data are crucial for understanding NS progression and optimizing care.

Purpose of the Study:

• To provide updated longitudinal natural history data for molecularly confirmed Noonan syndrome (NS).
• To analyze developmental outcomes, classroom settings, and healthcare utilization (HCU) in a contemporary NS cohort.
• To identify factors influencing developmental milestones and HCU in NS.

Main Methods:

• Retrospective chart review of 172 patients with molecularly confirmed NS.
• Data collection included medical, developmental, and healthcare utilization records.
• Analysis focused on age at developmental milestones and HCU patterns.

Main Results:

• Developmental milestones (sitting, walking, two-word phrases) were achieved earlier than in previous cohorts (P < .003).
• Genotype and feeding difficulties impacted milestone achievement and classroom placement.
• Healthcare utilization was significantly higher in NS patients compared to peers (P < .0001), peaking in infancy and adolescence.

Conclusions:

• Improved developmental outcomes in NS suggest benefits from current management strategies.
• Identifying outcome predictors can guide early interventions for at-risk individuals.
• The increased HCU burden in NS highlights the need for coordinated, multidisciplinary care to improve patient and family well-being.