#$%^&*AU2011265359B920140410.pdf#####C NRPonblDCC RR 4)550A4_l DOC.15/12/2011 ABSTRACT This invention relates to novel antibodies, particularly antibodies directed against deletion mutants of epidermal growth factor receptor and particularly to the type III deletion 5 mutant, EGFRvIII. The embodiments also relate to human monoclonal antibodies directed against deletion mutants of epidermal growth factor and particularly to EGFRvIII. The embodiments also relate to variants of such antibodies. Diagnostic and therapeutic formulations of such antibodies, and immunoconjugates thereof, are also provided.