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Study to Evaluate 3 Dosages of Estetrol After 28 Days Administration in Healthy Postmenopausal Women

This study has been completed.
ClinicalTrials.gov Identifier:
First Posted: September 13, 2005
Last Update Posted: May 21, 2012
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by (Responsible Party):
Pantarhei Bioscience
Estetrol is a natural compound that is produced by the fetus during fetal life and circulates in the unborn child and the mother. It is an estrogenic compound. In this study the safety and tolerability of 28 days of the oral administration of estetrol in healthy postmenopausal women are investigated. In addition, the pharmacokinetics and some pharmacodynamic parameters are studied. The lowest dose of 2 mg estetrol is directly compared with 2 mg estradiol.

Condition Intervention Phase
Healthy Drug: estetrol Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Phase I Study to Evaluate the Safety, Tolerability, PK and Pharmacodynamics of 3 Dosages of Estetrol, the Lowest Dose of 2 mg Estetrol Compared With 2 mg of E2, After Daily Oral Administration for 28 Days in Healthy Postmenopausal Women

Further study details as provided by Pantarhei Bioscience:

Primary Outcome Measures:
  • safety of estetrol
  • tolerability of estetrol

Secondary Outcome Measures:
  • steady state pharmacokinetics of estetrol
  • pharmacodynamic effects of estetrol
  • to compare the pharmacokinetics and pharmacodynamic effects of 2 mg estetrol with 2 mg estradiol
  • to investigate the effect on the number of hot flushes and sweating of 2 mg estetrol compared with 2 mg estradiol

Enrollment: 49
Study Start Date: June 2005
Study Completion Date: September 2007
Primary Completion Date: August 2007 (Final data collection date for primary outcome measure)
Detailed Description:

This is a partly randomized open-label study in healthy postmenopausal women. Groups are treated in the following sequence: first a 2 mg estetrol group together with a 2 mg estradiol group. When the dose of 2 mg estetrol is safe and the tolerability is good, a next higher dose group of estetrol will start, possibly followed by two next higher dose groups if the previous dose group is safe and the tolerability is good.

The primary objective of this study is to investigate the safety and tolerability of estetrol during multiple dosing for 28 days. Furthermore steady state pharmacokinetics and some pharmacodynamic parameters of estetrol will be investigated. In addition, the pharmacokinetics and pharmacodynamic effects of the 2 mg estetrol group will be compared with those of the 2 mg estradiol group.

In each group 5 postmenopausal women will be included with > 50 hot flushes per week and 5 postmenopausal women with < 10 hot flushes per week. These criteria are set to get a more homologous composition in each group.


Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Ages Eligible for Study:   18 Years to 70 Years   (Adult, Senior)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Postmenopausal women not older than 70 years of age at the time of screening (menopause defined as ≥ 6 months amenorrhea with serum follicle-stimulating hormone [FSH] levels ≥ 40 IU/L and serum E2 < 73 pmol/L).
  • Body mass index 18-30 kg/m2 inclusive.
  • Good physical and mental health, as judged by the Investigator, determined by medical history, physical examination, clinical laboratory values, vital signs, and electrocardiogram (ECG) recording.
  • Willing to give written informed consent.
  • Either > 50 hot flushes per week or < 10 hot flushes per week

Exclusion Criteria:

  • Clinically significant abnormal results of routine hematology, serum biochemistry, urinalysis, and/or ECG in the opinion of the Investigator at screening.
  • Clinically significant abnormal mammogram (presence of any non-cystic mass) within one year before study start.
  • Clinically significant abnormalities of the uterus and/or ovaries detected by examination and/or ultrasound (non-physiological ovarian mass or significant uterine pathology or an endometrium greater than 6 mm).
  • A cervical smear with clinically relevant abnormal cytology within one year before study start.
  • Previous use of estrogen/progestogen within:

    • 6 months for depot preparations.
    • 8 weeks for oral preparations or progestogen containing intrauterine device (IUD).
    • 4 weeks for transdermal preparations.
  • Use of hormone containing implant at any time.
  • Contraindications for using steroids:

    • A history of, or existing thromboembolic, cardiovascular, or cerebrovascular disorder.
    • A history of, or existing conditions predisposing to, or being prodrome of, a thrombosis.
    • A known defect in the blood coagulation system (e.g. deficiencies in antithrombin-III [AT-III], protein C, S, and activated protein C [APC] resistance).
    • A medical history positive for the presence of more than one risk factor for vascular disease (e.g. dyslipoproteinemia; diabetes mellitus; hyperhomocysteinemia; systemic lupus erythematosus; chronic inflammatory bowel disease; smoking; venous thromboembolism in sibling or parent below the age of 50, or arterial disease in sibling or parent below the age of 30-35).
    • Hypertension, i.e. systolic blood pressure >160 mm Hg and/or diastolic blood pressure >100 mm Hg.
    • Disturbance of liver function: cholestatic jaundice, a history of jaundice in pregnancy or jaundice due to previous estrogen use, Rotor syndrome and Dubin-Johnson syndrome.
    • Known or suspected estrogen-dependent tumors or endometrial hyperplasia
    • Undiagnosed vaginal bleeding.
    • Porphyria.
    • A history during pregnancy or previous estrogen use of severe pruritus, herpes gestationis, or deterioration of otosclerosis.
  • Any medication (including over-the-counter [OTC] products) from 14 days prior to the day of dosing except for occasional non-steroidal anti-inflammatory drugs (NSAID; e.g. ibuprofen); paracetamol is not permitted.
  • Any enzyme affecting drugs from 30 days prior to Day 1 and the use of griseofulvin, primidone, oxcarbazepine, topiramate, felbamate, or herbal remedies containing hypericum perforatum (St. John's wort).
  • Presence of significant allergies or other serious diseases.
  • Smoking more than 10 cigarettes or equivalent per day.
  • Administration of investigational drugs within 3 months before start of study medication.
  • A history of (within 12 months) alcohol or drug abuse.
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00163033

Kendle Clinical Pharmacology Unit
Utrecht, Netherlands, 3584 CJ
Sponsors and Collaborators
Pantarhei Bioscience
Study Director: Herjan Coelingh Bennink, MD, PhD Pantarhei Bioscience
  More Information

Responsible Party: Pantarhei Bioscience
ClinicalTrials.gov Identifier: NCT00163033     History of Changes
Other Study ID Numbers: PR3054
First Submitted: September 12, 2005
First Posted: September 13, 2005
Last Update Posted: May 21, 2012
Last Verified: May 2012

Keywords provided by Pantarhei Bioscience:
phase I study