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Previous studies demonstrated that activation of STAT3 is crucial for the development and progression of gastric cancer. However, the role of STAT3 in neuronal related gene methylation in gastric cancer has never been explored. In this study, by using DNA methylation microarray, we identified a potential STAT3 target, <jats:italic>C11orf87<\/jats:italic>, showing promoter hypomethylation in gastric cancer patients with lower STAT3 activation and AGS gastric cancer cell lines depleted with STAT3 activation. Although <jats:italic>C11orf87<\/jats:italic> methylation is independent of its expression, ectopic expression of a constitutive activated STAT3 mutant upregulated its expression in gastric cancer cell line. Further bisulfite pyrosequencing demonstrated a progressive increase in DNA methylation of this target in patient tissues from gastritis, intestinal metaplasia, to gastric cancer. Intriguingly, patients with higher <jats:italic>C11orf87<\/jats:italic> methylation was associated with better survival. Furthermore, hypermethylation of <jats:italic>C11orf87<\/jats:italic> was also frequently observed in other GI cancers, as compared to their adjacent normal tissues. These results suggested that <jats:italic>C11orf87<\/jats:italic> methylation may serve as a biomarker for diagnosis and prognosis of GI cancers, including gastric cancer. We further postulated that constitutive activation of STAT3 might be able to epigenetically silence <jats:italic>C11orf87<\/jats:italic> as a possible negative feedback mechanism to protect the cells from the overactivation of STAT3. Targeted inhibition of STAT3 may not be appropriate in gastric cancer patients with promoter hypermethylation of <jats:italic>C11orf87<\/jats:italic>.<\/jats:p>","DOI":"10.1371\/journal.pone.0250499","type":"journal-article","created":{"date-parts":[[2021,4,22]],"date-time":"2021-04-22T19:57:05Z","timestamp":1619121425000},"page":"e0250499","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":7,"title":["Methylomic analysis identifies C11orf87 as a novel epigenetic biomarker for GI cancers"],"prefix":"10.1371","volume":"16","author":[{"given":"Mita T. M. 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