Proto oncogenes are normal ones which carry the potential to be cancer forming ones ones, and can be triggered through mutagenic processes, cell growth misregulation or an abnormal translocation of a chromosome
New research indicates that antibodies can target intracelluar oncoproteins. Most recently it was thought that oncoproteins like PRL-3 could not be accessed via antibody attack as antibodies were too big to relocate themselves into the cell via the cell membrane.