Asociación Española
de Gastroenterología
Esófago-Estómago-Duodeno

Pilar García Iglesias
Coordinador

El grupo de trabajo de Esófago-Estómago-Duodeno (EED) fue constituido en 1999 y desde entonces agrupa a los socios de AEG interesados en la fisiología y las enfermedades de los órganos mencionados, y recoge algunas otras patologías gastroenterológicas que pueden afectar a tramos más distales del tubo digestivo.


Follow-Up Study Confirms the Presence of Gastric Cancer DNA Methylation Hallmarks in High-Risk Precursor Lesions.
2021 24
Revista
Cancers (Basel)
Número de registro del estudio
PMID: 34199386

Follow-Up Study Confirms the Presence of Gastric Cancer DNA Methylation Hallmarks in High-Risk Precursor Lesions.
Gómez A, Pato ML, Bujanda L, Sala N, Companioni O, Cosme Á, Tufano M, Hanly DJ, García N, Sanz-Anquela JM, Gisbert JP, López C, Elizalde JI, Cuatrecasas M, Andreu V, Paules MJ, Martín-Arranz MD, Ortega L, Poves E, Barrio J, Torres MÁ, Muñoz G, Ferrández Á, Ramírez-Lázaro MJ, Lario S, González CA, Esteller M, Berdasco M.

Cancers (Basel). 2021 Jun 2;13(11):2760. doi: 10.3390/cancers13112760.



Abstract

To adopt prevention strategies in gastric cancer, it is imperative to develop robust biomarkers with acceptable costs and feasibility in clinical practice to stratified populations according to risk scores. With this aim, we applied an unbiased genome-wide CpG methylation approach to a discovery cohort composed of gastric cancer (n = 24), and non-malignant precursor lesions (n = 64). Then, candidate-methylation approaches were performed in a validation cohort of precursor lesions obtained from an observational longitudinal study (n = 264), with a 12-year follow-up to identify repression or progression cases. H. pylori stratification and histology were considered to determine their influence on the methylation dynamics. As a result, we ascertained that intestinal metaplasia partially recapitulates patterns of aberrant methylation of intestinal type of gastric cancer, independently of the H. pylori status. Two epigenetically regulated genes in cancer, RPRM and ZNF793, consistently showed increased methylation in intestinal metaplasia with respect to earlier precursor lesions. In summary, our result supports the need to investigate the practical utilities of the quantification of DNA methylation in candidate genes as a marker for disease progression. In addition, the H. pylori-dependent methylation in intestinal metaplasia suggests that pharmacological treatments aimed at H. pylori eradication in the late stages of precursor lesions do not prevent epigenome reprogramming toward a cancer signature.

Keywords: CpG methylation; Helicobacter pylori; cancer risk prediction; intestinal type of gastric cancer; precursor lesions.