Our cell proliferation assay to investigate whether ODC1 inhibition suppressed cell growth in ODC1-high hepatoblastoma cell lines revealed that both ODC1 siRNA and difluoromethylornithine (DFMO), an ODC1 inhibitor, significantly inhibited cell proliferation (Fig. 5e, f and Supplementary Fig. 13). The gene discussed is ODC1; the disease is hepatoblastoma.