Endometriosis-Angiopoietin-like Protein-4

September 2, 2025 updated by: Merve Didem Eşkin Tanrıverdi, Ankara City Hospital Bilkent

Evaluation of Angiopoietin-like Protein 4 Levels in Patients With Endometriosis

Endometriosis is a chronic inflammatory disease associated with pelvic pain, dyspareunia, and impaired ovarian reserve. Cancer antigen-125 (CA-125) is widely studied but limited by low specificity, while angiopoietin-like protein-4 (ANGPTL4) has emerged as a potential biomarker due to its role in angiogenesis and inflammation. In the current study it was aimed to investigate serum and peritoneal fluid ANGPTL4 levels in women with endometriosis compared to healthy controls, and to evaluate their associations with clinical symptoms, serum CA-125, and anti-Müllerian hormone levels.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
80

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Turkey (Türkiye)
    • Not Valid
      • Ankara, Not Valid, Turkey (Türkiye), 06100
        • Ankara Bilkent City Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

Yes

Sampling Method

Non-Probability Sample

Study Population

Study population includes a total of 80 participants. The study group consists of 40 women with the diagnosis of endometriosis, and the control group consists of 40 healthy women.

Description

Inclusion Criteria:

  • Diagnosis of endometriosis for study group who underwent laparoscopic endometriosis surgery
  • Healthy women for control group

Exclusion Criteria:

  • Cardiovascular diseases including hypertension
  • Type 1 or type 2 diabetes mellitus
  • Morbid obesity
  • Primary adrenal insufficiency
  • Uterine fibroids
  • Thyroid dysfunctions including Hashimoto thyroiditis and Grave's disease
  • Hepatic dysfunctions
  • Renal insufficiency
  • Genetic disorders in chromosome constitution or karyotype analysis including monosomy X, trisomy X and gene mutations as BMP15, FMR I, POFIB, and GDF9
  • Neurologic diseases
  • Psychiatric disorders
  • Autoimmune diseases or syndromes including Addison's disease, autoimmune syndromes, scleroderma, Sjogren's syndrome, myasthenia gravis, inflammatory bowel diseases, multiple sclerosis, rheumatoid arthritis, systemic lupus erythematosus and familial Mediterranean fever
  • History of any malignancy
  • History of exposure to chemotherapeutic agents or radiotherapy

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Endometriosis group (Study group)
The study group included women with endometriosis. The study group consisted of women diagnosed with endometriosis who consecutively underwent laparoscopic endometriosis surgery.
Other: Angiopoietin-like protein-4 (ANGPTL4) Peritoneal Fluid Level
Measurement of peritoneal fluid levels of Angiopoietin-like protein-4 (ANGPTL4) level by ELISA method.
Other: Cancer Antigen 125 (CA-125) Serum Level
Measurement of venous blood serum level of CA-125 level by ELISA method.
Other: Angiopoietin-like protein-4 (ANGPTL4) Serum Level
Measurement of venous blood serum level of Angiopoietin-like protein-4 (ANGPTL4) Level level by ELISA method.
Healthy women (Control group)
Control group consisted of healthy women. The control group consisted of women who consecutively visited the outpatient clinic for routine gynecologic examinations and had no known diseases.
Other: Cancer Antigen 125 (CA-125) Serum Level
Measurement of venous blood serum level of CA-125 level by ELISA method.
Other: Angiopoietin-like protein-4 (ANGPTL4) Serum Level
Measurement of venous blood serum level of Angiopoietin-like protein-4 (ANGPTL4) Level level by ELISA method.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Serum and peritoneal fluid Angiopoietin-like protein-4 level
Time Frame: day 1
Nanogram/milliliter
day 1

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Serum cancer antigen 125 level
Time Frame: day 1
Unit/milliliter
day 1

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Ankara City Hospital Bilkent

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Merve Didem Eşkin Tanrıverdi, MD, Ankara City Hospital Bilkent

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
June 5, 2025

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
August 21, 2025

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
September 2, 2025

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
September 2, 2025

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 2, 2025

First Posted (Estimated)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
September 10, 2025

Study Record Updates

Last Update Posted (Estimated)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
September 10, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 2, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
September 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • TABED 1-25-1372

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

IPD are available which may be shared in necessary conditions.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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