Atrophic Gastritis, Dysplasia Stomach, Gastric Cancer, Helicobacter Pylori Infection
Conditions
Brief summary
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?
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.
Interventions
None listed
Sponsors
Agencia Nacional de Investigación y Desarrollo
European Union
Pontificia Universidad Catolica de Chile
Study design
Observational model
COHORT
Time perspective
RETROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
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.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| High grade dysplasia/Gastric adenocarcinoma | 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). |
Countries
Chile
Outcome results
None listed