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Early onset epileptic encephalopathy (EOEE) presents in infancy and results in significant morbidity, disability and reduced life expectancy.1 The aetiology is heterogeneous and includes chromosomal abnormalities, single-gene disorders, structural brain malformations and inborn errors of metabolism. Despite extensive investigations, a large number remain unexplained. Next-generation sequencing including whole exome sequencing (WES) of affected infants has a reported diagnostic yield of 10%–71%.2 We performed a cost analysis on a cohort of 50 patients with EOEE who had WES performed in a research setting. Some patients (17/50) had single WES, whereas the remainder had trio WES. All patients had extensive genetic, metabolic and neuroimaging investigations performed prior to WES, with no cause identified. The diagnostic rate of WES in this cohort was 42% …
Contributors EBF and CG: collated the data. NA: detailed the costings and calculations. EBF, KMG, NMA, JC, SAL, SE and MDK: contributed to the writing of the manuscript and approval of the final version submitted.
Competing interests None declared.
Ethics approval Temple Street Children’s University Hospital.
Provenance and peer review Not commissioned; externally peer reviewed.
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