Sumber : J Kedokter Trisakti, Januari-April 2001-Vol.20, No.1 Ditulis oleh : Elna Kartawiguna, Bagian Histologi Fakultas Kedokteran Universitas Trisakti ABSTRACTThe majority of cancers are caused by extrinsic factors. These include environmental carcinogens (chemical carcinogen, radiation and virus) and modifying factors (e.g., hormonal imbalance and dietary deficiency).Genetic and psychological factors also play a…