Inhibitory effects of 'beta'-carotene and vitamin A during the progression phase of hepatocarcinogenesis involve inhibition of cell proliferation but not alterations in DNA methylation - Moreno, Fernando Salvador; S-Wu, Ton; Naves, Maria Margareth Veloso; Silveira, Elaine Regina; Oloris, Sílvia Catarina Salgado; Costa, Maria Aparecida Lopes da; Dagli, Maria Lúcia Zaidan; Ong, Thomas Prates (Nutrition and Cancer, 2002)