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Line-1 methylation in ESCC and the matched non-tumor tissues. The methylation index (MI) of Line-1 was indicated by the mean and 95% CI in ESCC and Non-tumor tissues. The mean MI of Line-1 in ESCC (MI = 0.78) was lower than that in the matched non-tumor tissues (MI = 0.90, P < 0.0001). Statistical analyses were done using the paired t test.
