This phase I trial studies the side effects and best dose of defined green tea catechin
extract and to see how well it works in preventing liver cancer in patients with cirrhosis.
Higher levels of the molecule gamma-OHPdG may be found in patients with cirrhosis, which may
mean a higher risk of the development of liver cancer. Defined green tea catechin extract may
work better to lower levels of gamma-OHPdG and prevent the development of liver cancer.