PAOX and hepatocellular carcinoma: Next, we evaluated transcription of genes encoding PAOX and other polyamine-metabolizing proteins by RT-qPCR in several human cell lines, including Huh7.5 (hepatoma), A549 (lung adenocarcinoma), DU145 (prostate carcinoma), HeLa (cervix adenocarcinoma), and K562 (chronic myeloid leukemia).