the HER2/Neu receptor is a growth factor receptor i believe. Blocking this wont stop cancer it might slow it down though, to get cancer you need 6 mutations that either abolish the function of tumor supressors or over express oncogenes. HER2/Neu is only found in breast cancer so, blocking that receptor would only stop breast cancer from growing further. A better option would be to go after cells with mutations in P53 that result in no P53 activity( P53 is a protein that senses DNA damage and corrects it and can cause apoptosis). P53 damage is found in almost all cancers, so that would be a better protein to work on.
