This study was terminated on April 22th, 2010, based on a higher incidence of serious adverse events in the sunitinib arm compared to the sorafenib arm, and the fact that sunitinib did not meet the criteria to demonstrate that it was either superior or non-inferior to sorafenib in the survival of patients with advanced hepatocellular cancer. Patients on sunitinib who are judged by the investigator as receiving clinical benefit may chose to remain on study and continue treatment with sunitinib until clinical benefit as per the investigator's judgment.