Study of Oxytocin to Treat Vaginal Atrophy in Postmenopausal Women

NCT01432470 | Completed Phase 2

• 1 other identifier: OxyPeP-001
• Study Type: interventional
• Target: 74
• Locations: 2 countries
• Sites: 3

Brief Summary

Up to 50% of all postmenopausal women, experience vaginal dryness, irritation, burning, itching or discomfort, which often make sex to become difficult or painful. These symptoms combined are known as vaginal atrophy. Vaginal atrophy is a consequence of the lining tissue of the vagina becoming thinner, drier, and less elastic due to the lack of estrogen. In addition, vaginal atrophy is associated with an increased pH, which creates an environment more susceptible to infections. The mucosal epithelium shows signs of severe atrophy and cytological examination demonstrate increased number of the basal and parabasal cells and reduced number of superficial cells. Estrogen treatment either as hormone replacement therapy or topical application is a common treatment for vaginal atrophy. However, some women experience adverse reactions such as uterine bleeding, perineal pain and breast pain and many women are also reluctant to use estrogens due to a general negative view to this topic in the society. Oxytocin is a peptide hormone, which is normally released into the circulation via the pituitary. The most well known effects of oxytocin are its roles in female reproduction such as facilitation of birth and breast feeding. In addition, oxytocin has in vitro been shown to exert positive effects on the proliferation of human vaginal mucosal cells from postmenopausal women. Considering the stimulatory effects of oxytocin on vaginal mucosal cell proliferation, topical application of oxytocin to the vaginal mucosa may be an approach to treat vaginal atrophy. In one previous placebo-controlled study on 20 postmenopausal women suffering from vaginal atrophy, a gel containing oxytocin for topical intra-vaginal administration was applied daily for seven days. The results indicated that for subjects receiving topical oxytocin the vaginal atrophy assessed by histological examination was reversed after treatment. A similar effect was not seen in the placebo group, which indicated a difference between placebo and active treatment. However, the limited number of exposed subjects in this pilot study necessitates a larger study in order to generate conclusive proof of concept data for the effects of oxytocin on vaginal atrophy. Due to the limitations of estrogens in the treatment of vaginal atrophy, many postmenopausal women are left without an effective remedy. Hence, there is a need for alternative non-estrogenic treatments of this indication. The present study is aiming to investigate the efficacy of topical oxytocin in the treatment of vaginal atrophy. The main objective of this study is to investigate if topical oxytocin can reverse vaginal atrophy, as assessed by cytological examination of the vaginal mucosal epithelium, in postmenopausal women after 12 weeks of treatment as compared to placebo.

Conditions

Postmenopause; Vaginal Atrophy

Keywords

vaginal atrophy

Outcome Measures

Primary Outcomes (1)

• The Maturation Value (MV)

  The MV describes the change in percentage of superficial cells (Meisels A. The Maturation Value. Acta Cytol. 1967, Jul-Aug;11(4):249)

  12 weeks of oxytocin treatment as compared to placebo

Secondary Outcomes (9)

• Vaginal Atrophy

  12 weeks

• Quality of Life

  2 and 12 weeks

• The Maturation Value

  2 weeks

• Vaginal pH

  2 and 12 weeks

• Concentration of Oxytocin in serum

  0-60 min after drug admin.

Study Arms (2)

Oxytocin, Intravaginal administration

EXPERIMENTAL

Drug: Oxytocin

Placebo, Intravaginal administration

PLACEBO COMPARATOR

Drug: Placebo

Interventions

Oxytocin DRUG

Gel for intravaginal use, 600 IU once per day for 2 weeks followed by 600 IU twice a week for ten weeks

Oxytocin, Intravaginal administration

Placebo DRUG

Gel for intravaginal use of identical appearance as active substance, once per day for two weeks followed by twice a week for ten weeks

Placebo, Intravaginal administration

Eligibility Criteria

• Age: 40 Years+
• Sex: female
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Signed Informed Consent
• at least 40 years of age
• naturally postmenopausal women, completely without menstrual bleedings for at least four years prior to screening.
• FSH plasma levels at least 40 IU/L and 17β-estradiol levels less than 70pmol/L
• Vaginal pH more than 5.0
• BMI at most 29 kg/m2
• Vaginal atrophy verified by cytological assessment of the vaginal mucosal epithelium. Vaginal atrophy is defined as at most 5% of superficial cells.

You may not qualify if:

• Usage of any sex steroids including phytoestrogens, hormonal intra-uterine device or herbal medicinal products with known estrogenic effects within 3 months prior to screening.
• Any condition that is a contraindication to treatment with sex steroids
• Vaginal bleeding of unknown origin
• Any prior or concurrent malignant disease or endometrial hyperplasia
• Cervical cytology at least CIN 1 assessed during screening
• Clinically significant medical history (excluding medically well-controlled hypertension and hypercholesterolemia), findings from physical examinations, vital signs, cytology, histology or laboratory analyses that may interfere with the study objectives or compromise the safety of the subject as judged by the Investigator.
• Systolic Blood Pressure at least 140 mmHg or Diastolic Blood Pressure at least 90 mmHg at screening
• Participation in any other interventional clinical trial within 3 months prior to screening
• Known or suspected drug or alcohol abuse, within 12 months prior to screening
• Concurrent and diagnosed nephrologic or hepatic disorder
• Diagnosed with HIV, Hepatitis B or C
• Known or suspected allergy to any ingredient of the study product
• Incapacity to perform study procedures, as judged by the Investigator

Sponsors & Collaborators

• PepTonic Medical AB: lead

Study Sites (3)

Karolinska University Hospital-Huddinge

Huddinge, SE-141 86, Sweden

Location

Uppsala University Hospital

Uppsala, SE-751 85, Sweden

Location

Northwick Park & St Marks Hospital NHS Trust

Harrow Middlesex, HA1 3UJ, United Kingdom

Location

MeSH Terms

Interventions

Oxytocin

Intervention Hierarchy (Ancestors)

Pituitary Hormones, Posterior; Pituitary Hormones; Peptide Hormones; Hormones; Hormones, Hormone Substitutes, and Hormone Antagonists; Peptides; Amino Acids, Peptides, and Proteins

Study Design

• Study Type: interventional
• Phase: phase 2
• Allocation: RANDOMIZED
• Masking: DOUBLE
• Who Masked: PARTICIPANT, INVESTIGATOR
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: INDUSTRY

Study Record Dates

• First Submitted: August 16, 2010
• First Posted: September 13, 2011
• Study Start: August 1, 2010
• Primary Completion: June 1, 2011
• Study Completion: June 1, 2011
• Last Updated: September 13, 2011

Record last verified: 2011-09

Locations

SE (2); GB (1)