biostudies-literatureXu ENCI NIH HHS2750-6https://www.ebi.ac.uk/biostudies/studies/S-EPMC3845893biostudies-literatureUnknown34(12)Barrett's esophagus (BE) is a precursor of esophageal adenocarcinoma (EAC). To identify novel tumor suppressors involved in esophageal carcinogenesis and potential biomarkers for the malignant progression of BE, we performed a genome-wide methylation profiling of BE and EAC tissues. Using Illumina's Infinium HumanMethylation27 BeadChip microarray, we examined the methylation status of 27 578 CpG sites in 94 normal esophageal (NE), 77 BE and 117 EAC tissue samples. The overall methylation of CpG sites within the CpG islands was higher, but outside of the CpG islands was lower in BE and EAC tissues than in NE tissues. Hierarchical clustering analysis showed an excellent separation of NE tissues from BE and EAC tissues; however, the clustering of BE and EAC tissues was less clear, suggesting CarcinogenesisGenome-wide methylation analysis shows similar patterns in Barrett's esophagus and esophageal adenocarcinoma.PMC3845893CA138671P30 CA016672CA111922P01 CA130821Hawk ETHuang MGu JXu EWang KKAjani JLai MWu XfalseGenome-wide methylation analysis shows similar patterns in Barrett's esophagus and esophageal adenocarcinoma.Barrett's esophagus (BE) is a precursor of esophageal adenocarcinoma (EAC). To identify novel tumor suppressors involved in esophageal carcinogenesis and potential biomarkers for the malignant progression of BE, we performed a genome-wide methylation profiling of BE and EAC tissues. Using Illumina's Infinium HumanMethylation27 BeadChip microarray, we examined the methylation status of 27 578 CpG sites in 94 normal esophageal (NE), 77 BE and 117 EAC tissue samples. The overall methylation of CpG sites within the CpG islands was higher, but outside of the CpG islands was lower in BE and EAC tissues than in NE tissues. Hierarchical clustering analysis showed an excellent separation of NE tissues from BE and EAC tissues; however, the clustering of BE and EAC tissues was less clear, suggesting 2013-01-01T00:00:00Z2013 Dec2025-04-04T12:27:15.544Z2019-03-27T03:09:32ZS-EPMC38458932399692810.1093/carcin/bgt286