Activation of mitogen-activated protein kinases / extracellular signal-regulated kinases in human hepatocellular carcinoma. - Ito,Y.; Sasaki,Y.; Horimoto,M.; Wada,S.; Tanaka,Y.; Kasahara,K.; Ueki,T.; Hirano,T.; Yamamoto,H.; Fujimoto,J.; Okamoto,J.; Hayashi,N.; et al. (Hepatology, 1998)