Bioinformatic analysis of several GEO data sets revealed that Naa20 expression levels were markedly higher in HCC tumors (GSE36411, n = 42; GSE36376, n = 240; and GSE54236, n = 81) than in nontumor tissues (GSE36411, n = 21; GSE36376, n = 193; and GSE54236, n = 80; Fig. 1a and Supplementary Fig. S1a, b). Here, NAA20 is linked to hepatocellular carcinoma.