RASSF1 and hepatitis B virus infection: In most investigations, reduced levels of RASSF1A were found to be ubiquitous in HCC regardless of the etiologic factors associated with tumor development (hepatitis B or C chronic infection, alcohol consumption, exposure to food contaminated by aflatoxin B1, etc.), strongly suggesting that universal inactivation of RASSF1A in liver cancer is required for hepatocarcinogenesis [6, 16–22].