Intranasal Oxytocin vs. Placebo for the Treatment of Hyperphagia in Prader-Willi Syndrome

Phase 2 Study: Intranasal Oxytocin vs. Placebo for the Treatment of Hyperphagia in Children and Adolescents With Prader-Willi Syndrome

This study is a phase 2 randomized double blind 8-week treatment trial of intranasal OXT vs. placebo in 50 subjects aged 5 to 17 years with PWS in order to assess IN-OXT's affect on measurements of (1) eating behaviors (2) repetitive behaviors (3) weight and body composition (4) quality of life (5) salivary OXT and hormone levels (including ghrelin, pancreatic polypeptide, peptide YY, Glucagon-Like Peptide-1 (GLP-1), insulin, glucagon, testosterone, and estrogen). If superior to placebo, this data will add to the current knowledge that OXT is an effective treatment for hyperphagia as well as other symptoms of PWS.

Funding Source- FDA OOPD

Prader-Willi Syndrome (PWS) is a rare neurodevelopmental disorder caused by lack of expression of paternally derived imprinted material on chromosome 15q11-q13. PWS is characterized by mild to moderate intellectual disabilities, repetitive/compulsive behaviors and rigidity, social cognition deficits and severe hypotonia at birth, followed by the onset of hyperphagia later in life. Obesity is responsible for the majority of the morbidity and mortality associated with PWS, and compulsive eating behaviors are most responsible for diminishing the quality of life for caregivers and family members. Oxytocin has been implicated in the pathophysiology of PWS and there have been small studies of intranasal oxytocin (IN-OXT) in this population. To date, however, studies have not been adequately powered to detect significance in target symptoms of hyperphagia and associated symptoms of individuals with PWS. The primary goal of this study is to examine the safety and efficacy of IN-OXT on hyperphagia, as measured by the Hyperphagia Questionnaire-Clinical Trails, from baseline to week 8. Currently, there are no effective treatments available to manage hyperphagia in patients with PWS.

STUDY DESIGN: This is an 8-week double-blind, randomized study in 50 children with PWS aged 5-17. Participation involves 2 in-person visits to our program and 5 remote visits. Travel expenses will be reimbursed to participating families.

Inclusion Criteria:

1. Male or female pediatric outpatients aged 5 to 17 years
2. Must be in PWS nutritional phase 2b or 3 as determined by PI
3. Must be on growth hormone treatment and have been receiving stable doses of growth hormone treatment for at least 3 months prior to screening date. Treatment cannot have been interrupted for more than one week within 3 months of screening.
4. Diagnosis of PWS confirmed by patient medical records.
5. A score of at least moderate severity on the Hyperphagia Questionnaire for Clinical Trials at both screening and baseline visits.
6. Stable dosages of hormone treatments (including testosterone and estrogen supplements) for 4 weeks prior to randomization and for the duration of the study.
7. Stable dosages of metabolic treatments that could affect appetite (including metformin) for 4 weeks prior to randomization and for the duration of the study.
8. Physical exam and laboratory results that are within the normal range for individuals with PWS.
9. Presence of a parent/caregiver/guardian that is able to consent for their participation and complete assessments regarding the child's development and behavior change throughout the study.

Exclusion Criteria:

1. Exposure to any investigational agent in the 30 days prior to randomization.
2. Child not receiving growth hormone treatment
3. Children weighing less than 40 lbs
4. Children with unstable Type 2 Diabetes confirmed by Hemoglobin A1C levels at screening
5. Children with unstable medical co-morbidities at baseline.
6. Children with active upper respiratory infections at screening.
7. A primary psychiatric diagnosis other than Autism Spectrum Disorder (ASD), including bipolar disorder, psychosis, schizophrenia, Post-traumatic stress disorder (PTSD) or major depressive disorder (MDD). These patients will be excluded due to potential confounding results.
8. Pregnant or lactating patients or patients who will not agree to use a double barrier method of contraception. IN-OXT has not been studied in pregnant or lactating women.
9. Females using an estrogen-based contraceptive. As an alternative to an estrogen based contraceptive, subjects will be counseled to use progesterone-based contraceptives; cervical cap; cervical sponges; or spermicidal foam in combination with a condom. Subjects will need to use a double barrier method to be in the study.
10. A medical condition that might interfere with the conduct of the study, confound interpretation of study results or endanger the subject's well-being.
11. A known diagnosis of Rett's Syndrome of Childhood Disintegrative Disorder or marked sensory impairment such as deafness or blindness.
12. Subjects who have changes in allied health therapies, behavioral or educational interventions within four weeks prior to randomization other than those associated with school holidays.
13. Subjects who have had changes in medications or medication doses of risperidone, aripiprazole, other antipsychotic medications, clonidine, guanfacine, stimulants or anti-convulsants within four weeks of randomization.