A Study Extension Period of PEG-somatropin (Pegylated-somatropin) in the Treatment of Children With Idiopathic Short Stature

August 12, 2025 updated by: Changchun GeneScience Pharmaceutical Co., Ltd.

A Phase 2 Study Extension Period of Pegylated Somatropin (PEG-somatropin) in the Treatment of Children With Idiopathic Short Stature: An Open, Non-controlled Observational Study.

After the first stage (52 weeks) of Phase II clinical trial, Pegylated recombinant human growth hormone (PEG-rhGH) injection of appropriate dose in compliance with ISS clinical treatment strategy is used to treat children with ISS (Idiopathic Short Stature). The long-term efficacy and safety of the investigational product are evaluated, which can provide more scientific and reliable medication guidance information for clinical diagnosis and treatment.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Active, not recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
360

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • China
      • Shanghai, China
        • Shanghai Children's Hospital
      • Shanghai, China
        • Shanghai Children's Hospital of Fudan University
    • Beijing
      • Beijing, Beijing, China
        • Beijing Children's Hospital, Capital Medical University, National Center for Children's Health
    • Hubei
      • Wuhan, Hubei, China
        • Department of Pediatrics of Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan
    • Hunan
      • Changsha, Hunan, China
        • Hunan Children's Hospital
    • Jiangsu
      • Naning, Jiangsu, China
        • Children's Hospital of Soochow University
      • Nanjing, Jiangsu, China
        • The First Affiated Hospital of Nanjing Medical Universit
      • Wuxi, Jiangsu, China
        • Affiliated Hospital of Jiangnan University
      • Wuxi, Jiangsu, China
        • Wuxi Children's Hospital
    • Jiangxi
      • Nanchang, Jiangxi, China
        • Jiangxi Provincial Children's Hospital
    • Jilin
      • Changchun, Jilin, China
        • The First Hospital of Jilin University
    • Zhejiang
      • Hangzhou, Zhejiang, China
        • The Children's Hospital of Zhejiang University School of Medicine

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

4 years to 9 years (Child)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • All subjects who have completed the first stage (52 weeks) of Phase II clinical trial (including negative controls) with completed follow-up records may be enrolled in the extension period study.
  • Before the extension period study, the investigator shall fully inform the subjects and their guardians of all the information about the extension period study, including detailed follow-up procedure, treatment plan, laboratory examination items during follow-ups and possible benefits and risks. The extension period study shall only be initiated after the subjects and their guardians are well informed, and agree to cooperate and complete the treatment, follow-ups and examinations during the study, and sign the written informed consent.

Exclusion Criteria:

  • Subjects who have taken the following medications within 2 months before entering the extension period study:

    1. Aromatase inhibitors (which include but are not limited to Lelrozol and Anastrozole), with continuous medication ≥1 month;
    2. Gonadotropin releasing hormone analogues (which include but are not limited to Triptorelin, Leuprorelin and Goserelin),, with continuous medication ≥1 month;
    3. Sex steroids (which include but are not limited to any type of estrogen, progestin and androgen) , with continuous medication ≥1 month;
    4. Protein anabolic drugs (which include but are not limited to Oxandrolone, Danazol and Strombafort), with continuous medication ≥1 month;
    5. Glucocorticoids via oral/intravenous administration for more than 1 month..

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: PEG-somatropin
After the first stage (52 weeks) of Phase II clinical trial, the initial medication dose of this extension period is 0.2 mg/kg weight/week of PEG-rhGH for the high dose group, low dose group and negative control group, and it is adjusted in accordance with yearly height velocity (HV) and IGF-1 SDS of each visit. The maximum dose shall not exceed 0.4 mg/kg weight/week.
Drug: PEG-somatropin
After the first stage (52 weeks) of Phase II clinical trial, the initial medication dose of this extension period is 0.2 mg/kg weight/week of PEG-rhGH for high dose group, low dose group and negative control group, and it is adjusted in accordance with yearly height velocity (HV) and IGF-1 SDS of each visit. The maximum dose shall not exceed 0.4 mg/kg weight/week.
Other Names:
  • Polyethylene Glycol Recombinant Human Somatropin Injection

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Change of yearly height velocity (ΔHV)
Time Frame: Baseline，the end of 3-year addendum
Change of yearly height velocity before and after treatment. Yearly Height Velocity=12×(Height Yx - Height at Baseline)/(Date of Yx - Date of Baseline)(Yx refers to the height value at particular timepoint x)
Baseline，the end of 3-year addendum

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Standard deviation score of height at the actual age (ΔHT SDS)
Time Frame: Baseline，every 3 months，the end of 3-year addendum
Standard deviation score of height at the actual age.
Baseline，every 3 months，the end of 3-year addendum
Change fo Bone maturation
Time Frame: Baseline，every 3 months，the end of 3-year addendum
Change fo Bone maturation before and after treatement (bone age/chronological age)
Baseline，every 3 months，the end of 3-year addendum
Change of IGF-1 SDS (ΔIGF-1 SDS)
Time Frame: Baseline，every 3 months，the end of 3-year addendum
Change of IGF-1 SDS before and after treatement
Baseline，every 3 months，the end of 3-year addendum
Changes of standard deviation scores of body mass index (ΔBMI SDS)
Time Frame: Baseline，every 3 months，the end of 3-year addendum
Changes of standard deviation scores of body mass index
Baseline，every 3 months，the end of 3-year addendum
The yearly average dose of PEG-rhGH injection
Time Frame: Baseline，every 3 months，the end of 3-year addendum
Baseline，every 3 months，the end of 3-year addendum
Final height (FH)
Time Frame: Baseline，every 3 months，the end of 3-year addendum
Final height
Baseline，every 3 months，the end of 3-year addendum
The improvement of FH compared with the baseline predicted adult height (PAH)
Time Frame: Baseline，every 3 months，the end of 3-year addendum
Baseline，every 3 months，the end of 3-year addendum
Improvement of NAH (near adult height)
Time Frame: Baseline，every 3 months，the end of 3-year addendum
For subjects who reach NAH with treatment but fail to follow-ups before reaching FH, the improvement of NAH in comparison with the baseline PAH (predicted adult height) shall be evaluated
Baseline，every 3 months，the end of 3-year addendum
the improvement of PAH
Time Frame: Baseline，every 3 months，the end of 3-year addendum
For subjects who fail to reach NAH with treatment and fail to follow-ups before reaching FH, the improvement of PAH in comparison with the baseline PAH shall be evaluated
Baseline，every 3 months，the end of 3-year addendum
The changes of the scores evaluated by the Quality of Life Scale
Time Frame: Baseline，every 3 months，the end of 3-year addendum
Baseline，every 3 months，the end of 3-year addendum
The changes of lean body mass (LBM) (optional)
Time Frame: Baseline，every 3 months，the end of 3-year addendum
Baseline，every 3 months，the end of 3-year addendum
The changes of fat mass (torso) (FM) (optional)
Time Frame: Baseline，every 3 months，the end of 3-year addendum
Baseline，every 3 months，the end of 3-year addendum
The changes of the percentage of body fat (optional)
Time Frame: Baseline，every 3 months，the end of 3-year addendum
Baseline，every 3 months，the end of 3-year addendum
The changes of bone mineral density (BMD) (optional)
Time Frame: Baseline，every 3 months，the end of 3-year addendum
Baseline，every 3 months，the end of 3-year addendum

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Changchun GeneScience Pharmaceutical Co., Ltd.

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
The First Affiliated Hospital with Nanjing Medical University
Tongji Hospital
Affiliated Hospital of Jiangnan University
Children's Hospital of Fudan University
Shanghai Children's Hospital
The First Hospital of Jilin University
Beijing Children's Hospital
Children's Hospital of Soochow University
Hunan Children's Hospital
The Children's Hospital of Zhejiang University School of Medicine
Jiangxi Province Children's Hospital
Wuxi Women's & Children's Hospital

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Xiaoping Luo, Department of Pediatrics of Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
May 12, 2017

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
June 1, 2030

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
June 1, 2030

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
July 14, 2017

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 16, 2017

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
August 21, 2017

Study Record Updates

Last Update Posted (Estimated)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 15, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 12, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2025

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • GenSci 033 CT-Extension Period

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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