Sequencing of targeted therapies in HER2-positive metastatic breast cancer Figure 2 from Singh et al. British Journal of Cancer (2014) 111, 1888-1898 doi:10.1038/bjc.2014.388 Several approaches exist to target Eph receptors. Kinase inactivating strategies include kinase inhibitors or blocking peptides or antibodies. Kinase activating strategies include ligand stimulation, activating antibodies or ligand peptide mimetics Strategies to deliver toxic payloads following receptor activation and internalisation include coupling of cytotoxic agents or radionuclides to Eph monoclonal antibodies. © 2014 Cancer Research UK.