Skip to main content
OpenTrials
Completed

NCT Number: NCT04697381

Study of the Efficacy and Safety of Somatropin in Japanese Participants With PWS

This is a multicenter, open label, multi cohort study to evaluate the efficacy and safety of somatropin in a cohort of Japanese participants with PWS.

Completed

Looking for future studies?

Notify Me

Key information

Conditions

Prader-Willi Syndrome Abnormalities, Multiple Chromosome Disorders Congenital Abnormalities Congenital, Hereditary, and Neonatal Diseases and Abnormalities Genetic Diseases, Inborn Imprinting Disorders Intellectual Disability Nervous System Diseases Neurobehavioral Manifestations Neurologic Manifestations Nutrition Disorders Nutritional and Metabolic Diseases Obesity Overnutrition Overweight

Age range

0 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 3

Primary location

Kanagawa Children's Medical Center, Yokohama, Kanagawa, Japan

Loading trial locations.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Male or female participants with documentation of genetically confirmed diagnosis of PWS.
  • No plan to initiate a new treatment that may affect the body composition, such as gonadal hormone replacement therapy.
  • Currently on appropriate diet and exercise programs and willing to continue throughout the study period at the discretion of the investigator.
  • Participants, and if required by local/site regulations their parent(s)/legal guardian(s) must be willing and able to comply with all scheduled visits, treatment plan, laboratory tests, lifestyle considerations, and other study procedures.
  • Evidence of a personally signed and dated ICD (and written assent where applicable based on age and country regulation) indicating that the participant or a legally acceptable representative/parent(s)/legal guardian has been informed of all pertinent aspects of the study. Refer to Appendix 1 for the detailed process of obtaining consent.

For inclusion of GH naïve pediatric cohort, participants must meet criteria 6 to 8:

  • 18 years or younger.
  • Naïve to GH treatment.
  • Tanner stage 1 (for testes in males, for breasts in females).

For inclusion of GH treated pediatric cohort, participants must meet criteria 9 and 10:

  • Continued GH treatment for at least 2 years with stable dose for the last 6 months and being on GH at time of inclusion. The recent dose should be higher than 0.084 mg/kg/week.
  • Participants who are about to complete GH treatment for his/her short stature (eg, due to meeting the treatment stopping criteria defined as a height SDS more than -2.5 for Japanese adult standards).

For inclusion of adult cohort, participants must meet criteria 11 to 13:

  • 18 years of chronological age or older at Day 1 visit.
  • Off from GH treatment for at least 1 year.
  • Serum IGF-I level within +2 SDS, adjusted for age and sex.

Exclusion criteria

  • Participants with uncontrolled diabetes at the discretion of the investigator.
  • Participants with malignant tumors.
  • Participants with severe obesity or serious respiratory impairment.
  • Other medical or psychiatric condition including recent (within the past year) or active suicidal ideation/behavior or laboratory abnormality that may increase the risk of study participation or, in the investigator's judgment, make the participant inappropriate for the study.
  • Previous administration with an investigational drug within 30 days (or as determined by the local requirement) or 5 half- lives preceding the first dose of study intervention used in this study (whichever is longer).
  • Investigator site staff or Pfizer employees directly involved in the conduct of the study, site staff otherwise supervised by the investigator, and their respective family members.

Treatment and study plan

somatropin - GH naïve pediatric cohort

Biological

somatropin 0.245 mg/kg/week

somatropin - GH treated cohort

Biological

somatropin 0.084 mg/kg/week

somatropin - adult cohort

Biological

somatropin 0.084 mg/kg/week

Primary outcomes

  1. Change From Baseline to Month 12 in Lean Body Mass Measured by Dual-Energy X-ray Absorptiometry (DEXA): Adult Cohort

    Time frame: Baseline, Month 12

    Lean body mass, a measurement of body composition, was assessed by DEXA scan, and calculated as lean body mass (%) = lean body mass kilogram (kg) / (lean body mass [kg] + fat mass [kg]) *100.

  2. Change From Baseline to Month 12 in Lean Body Mass Measured by DEXA: GH Naive Pediatric and GH Treated Pediatric Cohort

    Time frame: Baseline, Month 12

    Lean body mass, a measurement of body composition, was assessed by DEXA scan, and calculated as lean body mass (%) = lean body mass (kg) / (lean body mass [kg] + fat mass [kg])*100.

Secondary outcomes

  1. Change From Baseline to Month 12 in Lean Body Mass Measured by Bioelectrical Impedance Analysis (BIA)-Adult Cohort

    Time frame: Baseline, Month 12

    Lean body mass, a measurement of body composition, was assessed by DEXA scan, and calculated as lean body mass (%) = lean body mass (kg) / (lean body mass [kg] + fat mass [kg])*100.

  2. Change From Baseline to Month 12 in Lean Body Mass Measured by BIA-GH Naive Pediatric and GH Treated Pediatric Cohort

    Time frame: Baseline, Month 12

    Lean body mass, a measurement of body composition, was assessed by DEXA scan, and calculated as lean body mass (%) = lean body mass (kg) / (lean body mass [kg] + fat mass [kg])*100.

  3. Change From Baseline to Month 12 in Body Fat (Percentage) Measured by DEXA: Adult Cohort

    Time frame: Baseline, Month 12

    Body fat was assessed by DEXA scan. and calculated as body fat (%) = body fat (kg) / [lean body mass (kg) + body fat (kg)]*100.

  4. Change From Baseline to Month 12 in Body Fat (Percentage) Measured by DEXA: GH Naive Pediatric and GH Treated Pediatric Cohort

    Time frame: Baseline, Month 12

    Body fat was assessed by DEXA scan. and calculated as body fat (%) = body fat (kg) / [lean body mass (kg) + body fat (kg)]*100.

  5. Change From Baseline to Month 12 in Adipose Tissue Distribution Measured by Abdominal Computed Tomography (CT)

    Time frame: Baseline, Month 12

    Adipose tissue distribution was measured by abdominal CT. Areas of subcutaneous adipose tissue (SAT) (centimeter square [cm^2]), visceral adipose tissue (VAT) (cm^2) were measured at the level of the umbilicus by abdominal CT.

  6. Change From Baseline to Month 6 in Lean Body Mass Measured by DEXA: Adult Cohort Only

    Time frame: Baseline, Month 6

    Lean body mass, a measurement of body composition, was assessed by DEXA scan, and calculated as lean body mass (%) = lean body mass (kg) / (lean body mass [kg] + fat mass [kg])*100.

  7. Number of Participants With Treatment Emergent Adverse Events and Serious Adverse Events

    Time frame: From day 1 up to 28 days after end of study treatment (maximum duration up to 38 months)

    An adverse event was any untoward medical occurrence in administered medicinal product, event need not necessarily have a causal relationship with product treatment or usage. A serious adverse event was any untoward medical occurrence in a participant administered a medicinal or nutritional product (including pediatric formulas) at any dose that: resulted in death; was life-threatening; required inpatient hospitalization or prolongation of hospitalization; resulted in persistent or significant disability/incapacity (substantial disruption of the ability to conduct normal life functions); resulted in congenital anomaly/birth defect. Treatment emergent AEs were events emerged during treatment period and were absent before treatment or that worsened relative to pretreatment state. TEAEs consist of SAEs and non-SAEs

  8. Number of Participants With Laboratory Test Abnormalities

    Time frame: From Day 1 up to 28 days after end of study treatment (maximum duration up to 38 months)

    Criteria for abnormal laboratory values for chemistry parameters: alanine aminotransferase, alkaline phosphatase greater than (>) 3.0*upper limit of normal (ULN), albumin > 1.2*ULN, urea nitrogen millimoles per liter (mmol/L) > 1.3*ULN, HDL cholesterol mmol/L less than (<) 0.8* lower limit of normal (LLN), LDL cholesterol mmol/L >1.2*ULN, triglycerides mmol/L > 1.3*ULN, thyrotropin milliunits per liter (mU/L) <0.8*LLN and >1.2*ULN, glucose (mmol/L) >1.5*ULN, hemoglobin A1C liter of cells per liter of blood (L/L) >1.3*ULN.

  9. Bone Maturation

    Time frame: 12 months

    Bone maturation is the process whereby the tissue undergoes changes from the embryonic rudiment of bone to the adult form. Bone maturation was calculated as bone age divided by chronological age. Participants with bone maturation value greater than 1 is presented in this outcome measure.

Sponsors and collaborators

Lead sponsor

Pfizer

Industry

Registry information

Official study title

A PHASE 3 MULTICENTER, OPEN LABEL, MULTI COHORT STUDY TO EVALUATE THE EFFICACY AND SAFETY OF SOMATROPIN IN JAPANESE PARTICIPANTS WITH PRADER-WILLI SYNDROME (PWS)

Important dates

Study start
2021
Primary completion
2022
Study completion
2024
First posted
Jan 6, 2021
Registry last updated
Jan 14, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Related clinical trials

Published trials that share one or more normalized conditions with this study.