1. Sarcoma Unit, The Royal Marsden Hospital, Fulham Road, London SW3 6JJ, UK
2. Department of Histopathology, The Royal Marsden Hospital, Fulham Road , London SW3 6JJ, UK
3. Department of Statistics, The Royal Marsden Hospital, Downs Road, Sutton SM2 5PT, UK
4. Department of Radiodiagnostics, The Royal Marsden Hospital, Fulham Road, London SW3 6JJ, UK
5. Spanish National Cancer Research Centre (CNIO), Clinical Research Programme, 3 Melchor Fernandez Almagro, 28029 Madrid, Spain
6. Department of Pharmacy, The Royal Marsden Hospital, Fulham Road, London SW3 6JJ, UK