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Endometriosis clinical trials

The registry lists 920 studies for Endometriosis across more than 10 countries. 266 are recruiting or about to start. 805 of them are mainly about Endometriosis (how this is decided). Per ClinicalTrials.gov, last updated 2026-11-10.

ClinicalTrials.gov finds 964 studies for Endometriosis. How that becomes 920 here

This page counts the studies the registry files under Endometriosis, and those it files under no condition that list Endometriosisthemselves. Each study its search finds is placed by how the registry filed it and by the conditions it lists. ClinicalTrials.gov counts as of Nov 8, 2026. How condition pages count

  1. 964Found by its condition searchIt reads the conditions a study lists and their synonyms, and also titles and keywords.
  2. −17List Endometriosis as a condition, but the registry did not file them under itMost often written as “Endometriosis Related Pain” (5), “Deep Endometriosis” (3), and “Endometriosis-related Pain” (2). The registry filed them under other conditions only, most often Urinary Bladder, Overactive (4) and Chronic Pain (2).
  3. −27Match it another way23 name it in the title and 4 in a keyword.
  4. 920The count on this page30 of them list Endometriosis in their own words; the registry filed them under no condition.

Get an email when these change. Save the Endometriosis studies recruiting or about to start — once a week, free: studies that open, close, add sites or post results.

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Example · made-up studies

Breast cancer · Recruiting: 2 came in, 3 changed

What changed in your saved searches, Oct 31 – Nov 6:

A study of drug A after surgery for early breast cancer

Came in · now Recruiting

Drug B with hormone therapy in advanced breast cancer

Changed

· Sites: 4 added, including Seoul and Busan

· Enrollment: 300 → 450 participants

Exercise during chemotherapy

Now Active, not recruiting

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Status

Completed
413
Recruiting
176
Status unknown
143
Not yet recruiting
75
Terminated
36
Active, not recruiting
31

Phase

Phase 2
116
Phase 3
64
Phase 4
50
Phase 1
40
Early Phase 1
9

Where

United States
168
France
128
Italy
104
China
47
Spain
42
Turkey
38

Who runs them

Bayer (27) · IRCCS Azienda Ospedaliero-Universitaria di Bologna (21) · AbbVie (14) · Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico (12) · Assistance Publique - Hôpitaux de Paris (12) · Kanuni Sultan Suleyman Training and Research Hospital (11) · University of Cagliari (10) · Hospices Civils de Lyon (10)

What is being tested here

Drugs under test in Endometriosis studies, those with the most open studies first. Medicines only given beside them are not counted. How drugs are counted

DrugOpenPhase 3All
Elagolix21122
Relugolix2710
Esketamine212
HS-10518202
Dienogest1412
Norethindrone Acetate127
Norethindrone127
Letrozole105
Triptorelin115
Gonadotropin-releasing Hormone Analog124

Drug classes tested here Hormonal contraceptives 1 open · Aromatase inhibitors 1 open · Statins 1 open · Local anesthetics 1 open · Progestins 5

Coming up

14phase 3 studies under way
94studies finish main data collection within a year3 of them phase 3

Studies recruiting or running, from their records. “Main data collection” ends at the primary completion date, the sponsor’s own estimate, which often moves.

The 10 nearest, phase 3 first

Who these studies take

Of the 176 Endometriosis studies recruiting now, 51 (29%) set no upper age limit and 123 (70%) stop at 75 or younger. 18 (10%) take children under 18. 167 (95%) are for women only and 0 (0%) for men only; 39 (22%) take healthy volunteers.

Recruiting studies that take each age, of 176
AgeWomenMen
107 (4%)2 (1%)
18165 (94%)9 (5%)
30174 (99%)8 (5%)
40166 (94%)8 (5%)
5093 (53%)7 (4%)
6557 (32%)6 (3%)
7554 (31%)6 (3%)
8553 (30%)6 (3%)

Across all 920 studies, recruiting or not: 73% stop at 75 or younger and 71% at 65; 9% take children; 95% are for women only and 1% for men only; 23% take healthy volunteers. From each study’s registry entry; the criteria on its page decide.

How long Endometriosis studies take

Of 44 phase 2 interventional studies under Endometriosis, half reached primary completion within 27 months of starting, counting those still running.

Start to primary completionEvery sponsorIndustryNon-industry
Phase 17 mo3–26 · 24 studies——
Phase 227 mo18–37 · 44 studies——
Phase 329 mo21–42 · 33 studies——
Interventional, no phase25 mo13–44 · 211 studies—24 mo13–44 · 196 studies
Observational30 mo14–47 · 182 studies—30 mo14–48 · 155 studies

Each figure is the month by which half the studies had reached primary completion, with the range in which the middle half did. Studies still running count until their last registry update; studies that stopped early are left out. Phase 1 includes early phase 1; observational means prospective or not stated, as retrospective and cross-sectional studies date a window of data rather than a study. How these figures are worked out

What changed recently

From the registry's own updates since Oct 13, 2026.

Started recruiting2

Results posted1

Newly registered11

Show 6 more

Studies

Recruiting first, then most recently updated. Showing 50 of 920. Browse all 920 → or search them.