Authors' Affiliations: 1Liver Cancer Institute, Zhong Shan Hospital and Shanghai Medical School, Fudan University, Key Laboratory for Carcinogenesis & Cancer Invasion, Chinese Ministry of Education; 2National Laboratory for Oncogenes and Related Genes, WHO Collaborating Center for Research on Cancer, Shanghai Cancer Institute, Shanghai Jiao Tong University School of Medicine; 3Experimental Research Center, Zhongshan Hospital, Fudan University; 4Institute of Biomedical Sciences, Fudan University, Shanghai, People's Republic of China (At 2009-08-31)