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Scientists decode the genetic secrets of periods

NCT ID NCT04085835

Knowledge-focused Sponsor: Institut National de la Santé Et de la Recherche Médicale, France Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looked at gene activity in the uterine lining during menstruation to understand why humans have periods while some other primates do not. Researchers collected menstrual fluid from 21 healthy women using a silicone cup, a non-invasive method. The goal was to learn more about the evolution and biology of menstruation, not to test a treatment.

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.

Participants

21 people

The number who actually took part.

Started

Oct 2020

Finished

Apr 2025

Lead sponsor

A government agency

The lead sponsor is a government body.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Healthy female volunteers experiencing regular periods

Ages

18 to 45 years

Sex

Female participants only

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show 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: * having regular periods * being comfortable using silicone menstrual hygiene devices ("cup") * having giving consent in writing Exclusion Criteria: * use of an internal contraception method (hormone or non-hormone based) during or within three months before the study * pregnancy during or within three months before the study * amenorrhea (absent periods) during or within three months before the study * gynaecological intervention or surgery within three months before the study * hormonal treatment during or within three months before the study * absence of written consent * breastfeeding * medical treatment during the study * low (\< 18.5) or high (\> 30) body mass index (BMI)

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Menstruation

Contacts and locations

Locations

  • Institut de Biologie de l'Ecole Normale Superieure

    Paris, Île-de-France Region, 75005, France

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