Abstract:Objective To investigate the serum miR-363 level of liver cancer and its relationship with clinicopathological features and its value in the diagnosis of liver cancer. Methods From January 2016 to December 2018 in Taizhou Hospital, patients with primary liver cancer were selected as the liver cancer group, and 86 healthy subjects were selected as the control group. The serum miR-363 level was determined by reverse transcriptionpolymerase chain reaction (RT-PCR). Results The serum miR-363 level in the liver cancer group was lower than that in the control group (P < 0.05), and the AFP level was higher than that in the control group (P < 0.05). There was significant difference in the relative expression of mir-363 in different TNM stages and with or without metastasis (P < 0.05). There were significant differences in the levels of serum miR-363 with different TNM staging and metastasis (P < 0.05).The serum miR-363 level was negatively correlated with AFP levels in patients with liver cancer (r = -0.502, P < 0.05). The areas under the ROC curve of miR-363, AFP, miR-363+AFP for diagnosis of liver cancer were 0.742 (95% CI: 0.740, 0.747), 0.884 (95% CI: 0.881, 0.887) and 0.938 (95% CI: 0.935, 0.941), respectively; the sensitivities were 90.70% (95% CI: 87.56, 93.21), 87.21% (95% CI: 84.32, 90.03), 82.56% (95% CI: 0.796, 0.855); the specificities were 66.28% (95% CI: 0.643, 0.673), 80.23% (95% CI: 0.782, 0.824) and 93.02% (95% CI :0.903, 0.962). Conclusion Serum miR-363 level is decreased in patients with liver cancer, and serum miR-363 has a certain guiding value in the assessment of severity and diagnosis of liver cancer.