Abstract
Objective To elucidate the correlation of methylation of long interspersed nucleotide element-1 (Line-1) with clinicalopathological features of gastric cancer.Methods Gastric cancer tissues and paracancerous tissues were collected from 30 patients and methylation status of Line-1 was detected in caner and corresponding normal tissues by using Pyrosequencing.Results The methylation level of Line-1in normal gastric and gastric cancer tissues was 75.1% and 65.8% respectively (P＜0.05).Among 30cancer tissues,methylation status of Line-1 was closely related to tumor infiltration (T1/T2:68.9%,T3/T4:61.3% ),lymph nodes metastasis ( NO:70.0%,N1:69.9%,N2:61.7%,N3:57.6% ) and distant metastasis ( MO:67.9%,M1:59.1% ) ( P ＜0.05) and declined with tumor progression,but wasn't associated with age,gender,location and differentiation ( P＞ 0.05 ).Conclusion Hypomethylation of Line-1 was remarkably related to infiltration and metastasis of gastric cancer and may contribute to the tumor progression. Key words: Gastric carcinoma; Line-1; Methylation
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