1. Piramed Pharma, 957 Buckingham Avenue, Slough, Berks SL1 4NL, United Kingdom, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, Cancer Research UK Centre for Cancer Therapeutics, The Institute of Cancer Research, Haddon Laboratories, Sutton, Surrey, SN2 5NG, United Kingdom and Breakthrough Breast Cancer Research Centre, The Institute of Cancer Research, London, SW3 6JB, United Kingdom