1. Cancer Research UK Cancer Therapeutics Unit, Division of Cancer Therapeutics, The Institute of Cancer Research, Sutton, United Kingdom;
2. Paediatric Oncology, Royal Marsden Hospital, Royal Marsden National Health Service Foundation Trust, Sutton, United Kingdom;
3. Haemato-Oncology Section, Royal Marsden Hospital, Sutton, United Kingdom; and
4. The Breast Cancer Now Toby Robins Research Centre, The Institute of Cancer Research, London, United Kingdom