1. Sarcoma Unit, Royal Marsden Hospital NHS Foundation Trust, Fulham Road, London, SW3 6JJ, UK
2. Sarcoma Unit, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, 33136 FL, USA
3. Sarcoma Unit, Vanderbilt–Ingram Cancer Center, Nashville, 37232 TN, USA
4. Insititute of Cancer Research, London, SM2 5NG, UK