---
title: Cohort Study of Endometriosis at Different Sites
nct_id: NCT04783623
overall_status: COMPLETED
sponsor: Peking Union Medical College Hospital
study_type: OBSERVATIONAL
primary_condition: Recruitment
countries: China
canonical_url: "https://parkinsonspathways.com/agent/trials/NCT04783623.md"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT04783623"
ct_last_update_post_date: 2021-03-05
last_seen_at: "2026-05-12T06:57:16.885Z"
source: ClinicalTrials.gov (mirrored, no enrichment)
---
# Cohort Study of Endometriosis at Different Sites

**Official Title:** Analysis of Clinical Characteristics and Risk Factors of Recurrence of Endometriosis at Different Sites

**NCT ID:** [NCT04783623](https://clinicaltrials.gov/study/NCT04783623)

## Key Facts

- **Status:** COMPLETED
- **Study Type:** OBSERVATIONAL
- **Target Enrollment:** 146
- **Lead Sponsor:** Peking Union Medical College Hospital
- **Conditions:** Recruitment
- **Start Date:** 2021-01-20
- **Completion Date:** 2021-03-02
- **CT.gov Last Update:** 2021-03-05

## Brief Summary

To present the clinical characteristics of pelvic or extra-pelvic endometriosis and explore the potential risk factors of pathogenesis and recurrence by comparing patients with endometriosis at different sites

## Detailed Description

Endometriosis is a chronic inflammatory disease defined as the presence of endometrial glands and stroma outside of the internal epithelial lining of the cavum uteri, affecting up to 10% of reproductive age women. It is rarely found in extrapelvic locations.This form of endometriosis may be difficult to diagnosis due to pleomorphic presentation. Despite complete excision with a safe margin and histopathological examination has been considered as definitive diagnosis and primary therapeutic treatment for extra-pelvic endometriosis, what is understood mainly comes from case reports and retrospective observations with limited number of cases. Moreover, approximately 6%-14% of patients with PEM who had underwent narrowly operative resection still suffered recurrent lesions, while risk factors were barely identified.

Patients with endometriosis at different sites in our hospital were collected for analysis of clinical characteristics namely demographic information, medical history, surgical records, pathological and imaging reports, serum levels of cancer antigen 125 (CA125), peri-operative medication. During long-term follow-up, prognosis of individuals could be identified by telephone or clinical interview. Based on data from medical records or clinical observation, risk model predicting recurrence will be established by comparing patients with different outcomes or exposed to different risk factors. Thus, management of endometriosis might be improved. Hopefully, pathogenesis of recurrent and primary endometriosis might be explained.

## Eligibility

- **Minimum age:** 18 Years
- **Maximum age:** 50 Years
- **Sex:** FEMALE
- **Healthy Volunteers:** Yes

```
Inclusion Criteria:

* Patients who were clinically diagnosed with endometriosis at different sites (pelvic and/or extra-pelvic) and received surgical treatment at PUMCH

Exclusion Criteria:

* i). underwent bilateral oophorectomy in the operation, ii). had incomplete records of inpatient management, iii). had no post-operative outpatient follow-up, iv). combined with malignancy.
```

## Arms

- **Non-recurrence group**
- **Recurrence group**

## Interventions

- **Surgical endometrioma excision** (PROCEDURE) — We collect medical records of patients who had underwent surgical endometrioma excision at different sites in our hospital and conduct telephone or clinical interview

## Primary Outcomes

- **clinicial outcome** _(time frame: 2 months)_ — recurrence or not

## Secondary Outcomes

- **clinical characteristics** _(time frame: 2 months)_

## Locations (1)

- Peking Union Medical College Hospital, Beijing, Beijing Municipality, China

## Recent Field Changes (last 30 days)

- `status.overallStatus` — added _(2026-05-12)_
- `status.primaryCompletionDate` — added _(2026-05-12)_
- `status.completionDate` — added _(2026-05-12)_
- `status.lastUpdatePostDate` — added _(2026-05-12)_
- `design.enrollmentCount` — added _(2026-05-12)_
- `eligibility.criteria` — added _(2026-05-12)_
- `eligibility.minAge` — added _(2026-05-12)_
- `eligibility.maxAge` — added _(2026-05-12)_
- `eligibility.sex` — added _(2026-05-12)_
- `outcomes.primary` — added _(2026-05-12)_
- `outcomes.secondary` — added _(2026-05-12)_
- `armsInterventions.arms` — added _(2026-05-12)_
- `armsInterventions.interventions` — added _(2026-05-12)_
- `sponsor.lead` — added _(2026-05-12)_
- `results.hasResults` — added _(2026-05-12)_
- `locations.peking union medical college hospital|beijing|beijing municipality|china` — added _(2026-05-12)_

---

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