The oncogenic virus can only be studied as a carcinogen when its relation to the host cell in which it resides is understood. The interaction between tumor virus and host cell was the subject of a recent North Atlantic Treaty Organization Advanced Study I stitute. This volume is the edited proceedings of this study institute. One problem of fundamental importance in understanding malignant transformation is the mechanism by which the oncogenic vector promotes the aberrations in the host cell regulatory appara- tus resulting in a cancerous cell. It is partly the purpose of this volume to help...