Twice-Yearly shot could halt early puberty in kids
NCT ID NCT05493709
First seen Jun 25, 2026 · Last updated Jul 21, 2026 · Updated 3 times
Summary
This phase 3 trial tests a new formulation of leuprolide (FP-001) given as two injections six months apart in 93 children with central precocious puberty—a condition where puberty starts too early. The goal is to see if it can safely pause puberty by keeping hormone levels low. If it works, it could mean fewer injections for children needing treatment.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Leuprolide (a hormone blocker)
- What this could lead to
- If successful, this could provide a treatment that pauses early puberty with just two injections per year, reducing the need for more frequent shots.
- What could go wrong
- This is a single-arm, open-label study with no placebo group, so results may be less definitive. The treatment is not a cure—it only delays puberty while active, and long-term effects are still being studied.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 3
Large-scale testing in a bigger group. Usually the last step before a treatment can be approved.
- Participants
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94 people
The number who actually took part.
- Started
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Jun 2023
- Finished
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May 2026
- Lead sponsor
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A company
The lead sponsor is a pharmaceutical, biotech, or medical-device company.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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2 to 9 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: 1. Females aged 2 to 8 years (inclusive) or males aged 2 to 9 years (inclusive). 2. Confirmed diagnosis of CPP within 12 months of Baseline Visit (Day 0) but have not received prior GnRHa treatment for CPP. 3. Pubertal-type LH response at 60 minutes post GnRHa stimulation test before treatment initiation \> 5 mIU/mL. 4. Clinical evidence of puberty, defined as Tanner stage ≥ 2 for breast development in females or testicular volume ≥ 4 mL in males. 5. Willing and able to participate in the study. 6. Difference between bone age (Greulich and Pyle method) and chronological age ≥ 1 year. 7. Bone age \< 13 years for girls and \< 14 years for boys. 8. Signed Institutional Review Board/Independent Ethics Committee (IRB/IEC)-approved informed consent form (ICF) by one or both parents (per IRB/IEC requirements), by the custodial parent(s) or by the legal guardian(s) (if required). 9. Signed Assent by patients as per IRB/IEC requirements. Exclusion Criteria: 1. Gonadotropin-independent (peripheral) precocious puberty: extra pituitary secretion of gonadotropins or gonadotropin-independent gonadal or adrenal sex steroid secretion. This includes true CPP triggered by other conditions, such as congenital adrenal hyperplasia. 2. Prior or current GnRH treatment for CPP. 3. Non-progressing isolated premature thelarche. 4. Presence of an unstable intracranial tumor or an intracranial tumor requiring neurosurgery or cerebral irradiation. Patients with hamartomas or adenomas not requiring surgery are eligible. 5. Any other condition, chronic illness or treatment that, in the opinion of the Investigator, may interfere with growth or other study endpoints (e.g., chronic steroid use \[except mild topical steroids\], renal failure, diabetes, moderate to severe scoliosis, previously treated intracranial tumor). 6. Prior or current therapy with medroxyprogesterone acetate, growth hormone or insulin-like growth factor-1 (IGF-1). 7. Major medical or psychiatric illness that could interfere with study visits. 8. Diagnosis of short stature (i.e., 2.25 standard deviations (SD) below the mean height for age). 9. Positive urine pregnancy test. 10. Known hypersensitivity to GnRH or related compounds. 11. Any other medical condition or serious intercurrent illness that, in the opinion of the Investigator, may make it undesirable for the patients to participate in the study. 12. Any other condition(s) which could significantly interfere with Protocol compliance. 13. Treatment with an investigational product within 5 half-lives of that product in prior clinical studies before the baseline visit (Day 0). 14. Known history of seizures, epilepsy, and/or central nervous system disorders that may be associated with seizures or convulsions. 15. Prior (within 6 months of Baseline (Day 0)) or current use of medications that, per Investigator opinion, have been associated with seizures or convulsions.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Arizona University
Tucson, Arizona, 85719, United States
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Beijing Children's Hospital, Capital Medical University
Beijing, China
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Chang Gung Memorial Hospital-Kaohsiung branch
Kaohsiung City, 704302, Taiwan
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Changhua Christian Hospital
Changhua, 50006, Taiwan
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Chengdu Women's and Children's Central Hospital
Chengdu, Sichuan, China
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Children's Hospital affiliated to Capital Institute of Pediatrics
Beijing, Chaoyang District, China
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Children's Hospital of Fudan University
Shanghai, China
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Children's Hospital of Shanghai
Shanghai, China
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Children's Hospital of Shanxi
Taiyuan, Shanxi, China
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Children's Hospital of Soochow University
Suzhou, Jiangsu, China
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China Medical University Hospital
Taichung, Taiwan
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Cook Children's
Fort Worth, Texas, 76104, United States
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Hunan Children's Hospital
Changsha, Hunan, China
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Indiana University
Indianapolis, Indiana, 46202, United States
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Jiangxi Provincial Children's Hospital
Nanchang, Jiangxi, China
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Johns Hopkins - All Children's Hospital
St. Petersburg, Florida, 33701, United States
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LinKou Chang-Gung Memorial Hospital (CGMH-LK)
Taoyuan City, 333423, Taiwan
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Mackay Memorial Hospital
Taipei, 104217, Taiwan
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Multicare Health System
Tacoma, Washington, 98405, United States
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National Cheng Kung University Hospital
Tainan, Taiwan
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Nemours Children's Health Center
Jacksonville, Florida, 32207, United States
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Ningbo Women & Children's Hospital
Ningbo, Zhejiang, China
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Pearl River Hospital, Southern Medical University
Guangzhou, Guangdong, China
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Rady Children's Hospital- San Diego
San Diego, California, 92123, United States
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Rocky Mountain Clinical Research
Idaho Falls, Idaho, 83404, United States
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Shanghai Children's Medical Center
Shanghai, China
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Shengjing Hospital of China Medical University
Shenyang, Liaoning, China
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Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University
Guangzhou, Guangdong, China
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The Children's Hospital, Zhejiang University School of Medicine
Hangzhou, Zhejiang, China
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The First Affiliated Hospital, Sun Yat-sen University
Guangzhou, Guangdong, China
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The First Bethune Hospital of Jilin University
Changchun, Jilin, China
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The First Hospital of Jiaxing Affiliated Hospital of Jiaxing University
Jiaxing, Zhejiang, China
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The Second Hospital of Anhui Medical University
Hefei, Anhui, China
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The Third Affiliated Hospital, Sun Yat-Sen University
Guangzhou, Guangdong, China
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The first Affiliated Hospital of Xiamen University
Xiamen, Fujian, China
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Tianjin Medical University General Hospital
Tianjin, China
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Tongji Hospital, Tongji Medical College of HUST
Wuhan, Hubei, 430030, China
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University Pediatric Hospital
San Juan, 00935, Puerto Rico
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University of Texas Southwestern Medical Center
Dallas, Texas, 75390, United States
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Virginia University
Charlottesville, Virginia, 22908, United States
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Wuhan Children's Hospital, Tongji Medical College of HUST
Wuhan, Hubei, China