Oncoproteins are any proteins coded by an oncogene and they play an important role in the regulation or synthesis of proteins linked to tumorigenic cell growth. Some oncoproteins are accepted and used as tumor markers. This book presents topical research data in the study of oncoproteins, including the cellular redox environment and oncongenes/tumor suppressors in breast cancer cells; cell surface oncoproteomics; site specific references for oncoprotein tumor markers; oncoproteins in tropical infections; and the E7 oncoprotein of human papillomavirus.