1. Assessing the potential value of long interspersed element-1 hypomethylation in colorectal cancer: evidence from retrospective studies
- Author
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Tang JT, Wang ZH, and Fang JY
- Subjects
lcsh:Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,lcsh:RC254-282 ,digestive system diseases - Abstract
Jie-Ting Tang,1,2 Zhen-Hua Wang,1,2 Jing-Yuan Fang1,2 1Division of Gastroenterology and Hepatology, Renji Hospital, 2Shanghai Institute of Digestive Disease, School of Medicine, Shanghai Jiao Tong University, Shanghai, People’s Republicof China Background and aims: Long interspersed element-1 (LINE-1) hypomethylation may play an important role in colorectal cancer (CRC). Studies were identified that investigated LINE-1 methylation levels in CRC compared with normal controls.Methods: The random-effects model was used to estimate standardized mean difference with 95% confidence intervals according to the heterogeneity between the studies. We explored the relationship between LINE-1 hypomethylation and microsatellite instability (MSI) status, clinical features, and molecular features in CRC patients using a fixed-effects model.Results: A total of 7396 CRC patients were included in the meta-analysis. LINE-1 methylation was significantly lower in CRC patients than in controls (P=0.000). Mean LINE-1 methylation was significantly lower in non-MSI-high than in MSI-high tumors (P=0.000). LINE-1 hypomethylation was found more frequently in patients with a family history compared with those without family history (P=0.002). Patients with left colon cancer had lower LINE-1 methylation than those with right colon cancer (P=0.001). LINE-1 methylation was not associated with body mass index or patient sex. LINE-1 hypomethylation was found in p21 lost tumors (P=0.000). LINE-1 methylation levels were not associated with KRAS or PIK3CA-mutation status.Conclusion: LINE-1 hypomethylation is a potential biomarker for risk of CRC and associated with various clinical and molecular features of CRC. Keywords: LINE-1, hypomethylation, colorectal cancer, MSI
- Published
- 2015