Acadia Pharmaceuticals Inc. (NASDAQ:ACAD) today announced that two oral presentations featuring DAYBUE (trofinetide) findings in Rett syndrome will be presented at the American Academy of Neurology (AAN) 2024 annual meeting, being held this week in Denver, CO.

The presentations include outcomes from the DAFFODIL, a Phase 2/3 open-label study evaluating the safety, tolerability and exploratory efficacy of DAYBUE in girls aged two to four living with Rett syndrome, as well as findings from exit interviews with caregivers of individuals living with Rett syndrome who participated in the LAVENDER, LILAC, LILAC-2 and DAFFODIL studies.

AAN Oral Presentations:

• Oral Presentation 003/Abstract 3540: Trofinetide for the Treatment of Girls Aged Two to Four Years with Rett Syndrome: Final Results from the Open-label DAFFODIL Study, Wednesday, April 17 at 3:54pm MT
• Oral Presentation 008/Abstract 2877: Assessing Experiences with Trofinetide for Rett Syndrome: Interviews with Caregivers of Patients in Open-label Studies, Wednesday, April 17 at 4:54pm MT

About Rett Syndrome

Rett syndrome is a rare, complex, neurodevelopmental disorder that may occur over four stages and affects approximately 6,000 to 9,000 patients in the U.S., with approximately 5,000 patients currently diagnosed according to an analysis of healthcare claims data.1-4 A child with Rett syndrome exhibits an early period of apparently normal development until six to 18 months, when their skills seem to slow down or stagnate. This is typically followed by a duration of regression when the child loses acquired communication skills and purposeful hand use. The child may then experience a plateau period in which they show mild recovery in cognitive interests, but body movements remain severely diminished. As they age, those living with Rett may continue to experience a stage of motor deterioration which can last the rest of the patient's life.5 Rett syndrome is typically caused by a genetic mutation on the MECP2 gene.5 In preclinical studies, deficiency in MeCP2 function has been shown to lead to impairment in synaptic communication, and the deficits in synaptic function may be associated with Rett manifestations.5-7

Symptoms of Rett syndrome may also include development of hand stereotypies, such as hand wringing and clapping, and gait abnormalities.8 Most Rett patients typically live into adulthood and require round-the-clock care.2,9

About DAYBUE (trofinetide)

Trofinetide is a synthetic analog of the N-terminal tripeptide of insulin-like growth factor 1. The mechanism by which trofinetide exerts therapeutic effects in patients with Rett syndrome is unknown. Trofinetide is thought to enhance neuronal synaptic function and morphology. This hypothesis is supported by findings from studies of trofinetide in a methyl-CpG-binding protein 2 gene (Mecp2) mouse model of Rett syndrome, in which increased branching of the dendrites that form synapses and synaptic plasticity signals were observed.10