Clinical trial Recruiting at 2 sites Phase 1 Interventional Ages 18 to 45 Women only

Leuprorelin-like 3.75 mg injection comparison in endometriosis

Official title: A Phase Ia Clinical Trial to Compare Pharmacokinetics, Pharmacodynamics, Safety and Preliminary Efficacy of HHK001 Versus Enantone in Patients With Endometriosis

Run by Zhuhai Huahaikang Pharmaceutical Technology Co., Ltd. · NCT07755956 · Data updated 2026-11-12

This study tests whether a new formulation of leuprorelin (HHK001) given as a single 3.75 mg injection works similarly or better than Enantone for people with endometriosis.

Quick facts

PhasePhase 1
Study typeInterventional
Ages18 Years to 45 Years
SexWomen only
Enrollment20 (estimated)
SponsorZhuhai Huahaikang Pharmaceutical Technology Co., Ltd.
Industry-sponsored
Locations2 sites (Changsha, Hunan and 1 other locations)
StatusRecruiting
StartedOctober 31, 2026
Main results expectedMarch 31, 2027
Study endsMarch 31, 2027
Registry record updatedNovember 2, 2026
Trial IDNCT07755956 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Women aged 18-45 with confirmed endometriosis, suitable for GnRH agonist therapy, and meeting health criteria.

Probably not a fit

Individuals with contraindications to GnRH agonists, recent GnRH treatment, or conditions that increase risk for adverse effects may not benefit.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This Phase 1 trial compares HHK001 to Enantone, both containing leuprorelin acetate, in adults with endometriosis. Participants receive a single 3.75 mg injection and are monitored for pharmacokinetics, pharmacodynamics, safety, and clinical benefit. The study focuses on absorption, bodily response, and potential side effects for the updated formulation. Researchers aim to identify any advantages of HHK001 over Enantone while ensuring participant safety.

Why it matters

Potential benefit: If successful, HHK001 could offer a comparable or improved therapy option with the same active ingredient.

How similar studies have gone: Previous studies have tested leuprorelin formulations; this study explores a novel formulation to determine if it provides benefits or comparable results.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Voluntarily provide written informed consent;
* Female, aged 18-45 years, weight ≥ 40 kg, body mass index 19-28 kg/m²;
* The most recent menstrual cycle 21-35 days;
* Confirmed diagnosis of endometriosis, and suitable for GnRH agonist;
* Cervical cytology test result showing No Intraepithelial Lesion or Malignancy;
* No plan for pregnancy, egg cryopreservation or donation, and agree to use effective contraception from screening through 3 months after dosing.

Exclusion Criteria:

* Allergic to GnRH agonists/antagonists, or history of allergies to ≥3 different substances, or active allergic disease;
* With contraindications to rescue medication (ibuprofen);
* Current or past medical history of osteoporosis/osteopenia, pituitary tumor, epilepsy, depressive disorder, thromboembolic events, malignant tumors, unexplained abnormal uterine bleeding;
* Received any GnRH agonist/antagonist within 12 weeks before screening;
* Received medications that may significantly alter hypothalamic-pituitary-gonadal axis hormone levels within 4 weeks before screening;
* History of miscarriage within 4 weeks before screening;
* History of alcohol dependence, drug abuse or illicit substance use;
* Other conditions unsuitable for the trial judged by the investigator.

Where it's running

  • The Third Xiangya Hospital of Central South University
    Changsha, Hunan, China
    Recruiting
  • Suzhou Municipal Hospital (The Affiliated Suzhou Hospital of Nanjing Medical University)
    Suzhou, Jiangsu, China
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
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Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.