RB1 and hepatocellular carcinoma: In summary, KIAA0101 overexpression, at mRNA and protein levels, frequently occurs in HCC without concurrent KIAA0101 gene amplification, indicating that KIAA0101 is probably transcriptional upregulated by other factors, such as FoxM1 or transcription factors in p53-p21 pathway, Rb/E2F pathway, etc. Significant correlations between the expression of KIAA0101 protein and p53 and Ki-67 proteins in HCC were observed in this study, indicating the connection between the aberrant p53 pathways and the enhanced cell cycle progression.