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The purpose of the current study is to clarify the epigenetic function of long non-coding RNA (lncRNA) H19 in lung cancer as well as the relevant regulatory mechanism. We first determined H19 upregulation in A549 cells. DNA damage model was established in A549 cells by exposure to X-ray and then ionizing radiation (IR). The degree of DNA damage in the IR cell model was assessed by Comet assay. Gain- and loss-of-function assays were employed to clarify the roles of H19 and miR-675 in DNA damage of A549 cells. The results demonstrated that H