Endoscopic Surveillance on a High-risk Population for Gastric Cancer in Latin America: The ECHOS Cohort Study. (ECHOS)

July 27, 2023 updated by: Pontificia Universidad Catolica de Chile

The Impact of Endoscopic Surveillance of Atrophic Gastritis With and Without Intestinal Metaplasia on a High-risk Population for Gastric Cancer in Latin America: The ECHOS Cohort Study.

The goal of this observational study is to evaluate the risk factors associated with incident HGD/GA in patients with CAG with or without IM who are enrolled in endoscopic surveillance, as well as to compare GA incidence according to the OLGA and OLGIM scales in patients 18 years or older.

. The main questions it aims to answer are:

What risk factors are associated with incident HGD/GA in patients with CAG with or without IM?
What is the comparative HGD/GA incidence according to the OLGA and OLGIM scales?

Study Overview

Status

Completed

Conditions

Detailed Description

The Endoscopic Cohort and Histological OLGA staging (ECHOS) study is a retrospective longitudinal cohort developed in the Pontificia Universidad Católica de Chile health care system, an open health care system with 3 endoscopic units in Santiago, Chile. Patients 18 years or older were eligible for the study if they had at least one non-urgent outpatient EGD with gastric biopsies collected following the USSBP between June 2015 and June 2021. The baseline EGD was defined as the earliest examination conducted between this time frame that met inclusion criteria. Participants were included in the cohort if they underwent a subsequent "surveillance" EGD. In order for the subsequent EGD to qualify as surveillance, it needed to occur at least 6 months after the baseline EGD and include gastric biopsies collected according to the USSBP; one exception to the USSBP requirement was if HGD or GA was detected on the surveillance (i.e. non-baseline) EGD. Patients with prior history of HGD or any type of gastric malignancy, gastrectomy or non-gastric active malignancy were excluded. Also, patients with HGD or GA on the baseline EGD were excluded. Patients with indefinite (IND) or low-grade dysplasia (LGD) on the baseline EGD were considered for the cohort.

Study Type

Observational

Enrollment (Actual)

685

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

Chile
- Metropolitana
  - Santiago, Metropolitana, Chile
    - Centro Médico UC-CHRISTUS San Joaquín
- Región Metropolitana
  - Santiago, Región Metropolitana, Chile
    - Centro de especialidades médicas Marcoleta UC CHRISTUS

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

Ages Eligible for Study

Adult
Older Adult

Accepts Healthy Volunteers

Sampling Method

Non-Probability Sample

Study Population

Patients atteding an EGD at Pontificia Universidad Católica de Chile health care system, an open health care system with three endoscopic units in Santiago, Chile.

Description

Inclusion Criteria:

At least one non-urgent outpatient esophagogastroduodenoscopy (EGD) with gastric biopsies collected following the Updated Sydney System Biopsy Protocol (USSBP) between June 2015 and June 2021.
Underwent a subsequent "surveillance" EGD. For the subsequent EGD to qualify as surveillance, it needed to occur at least six months after the baseline EGD and include gastric biopsies collected according to the USSBP; one exception to the USSBP requirement was if HGD or GA was detected on the surveillance.

Exclusion Criteria:

Prior history of HGD or any type of gastric malignancy, gastrectomy, or non-gastric active malignancy.
HGD or GA on the baseline EGD was excluded.

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

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
High grade dysplasia/Gastric adenocarcinoma Time Frame: At least 6 months between first and second EGD, assessed up to 96 months	Progression from chronic atrophic gastritis or intestinal metaplasia according to baseline Operative Link on Gastritis Assessment (OLGA) staging in baseline measurement to high-grade dysplasia and adenocarcinoma. The OLGA uses grades from in tiered scale from 0 to IV, resulting from the combination of atrophic changes (0 = absent; 1 = mild; 2 = moderate; 3 = severe) in the two mucosal compartments (antrum and corpus).	At least 6 months between first and second EGD, assessed up to 96 months

Collaborators and Investigators

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

Sponsor

Pontificia Universidad Catolica de Chile

Collaborators

European Union

Agencia Nacional de Investigación y Desarrollo

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)

June 1, 2015

Primary Completion (Actual)

June 30, 2021

Study Completion (Actual)

March 6, 2023

Study Registration Dates

First Submitted

June 28, 2023

First Submitted That Met QC Criteria

July 27, 2023

First Posted (Actual)

August 1, 2023

Study Record Updates

Last Update Posted (Actual)