SLC52A2 and hepatocellular carcinoma: The risk score of each HCC patient was calculated as the followed formula: Risk score = (0.00012 * ASAP1 expression) + (0.03015 * IARS1 expression) + (0.01875 * GTF3C2 expression) + (0.01875 * TPD52L2 expression) + (0.00493 * SLC52A2 expression).