[1] Dana Farber Canc Inst, Boston, MA 02115 USA
[2] Inst Canc Res, London SW3 6JB, England
[3] Royal Marsden NHS Fdn Trust, London, England
[4] H Lee Moffitt Canc Ctr & Res Inst, Tampa, FL USA
[5] Univ Texas MD Anderson Canc Ctr, Dept Sarcoma Med Oncol, Houston, TX 77030 USA
[6] Merck & Co Inc, Kenilworth, NJ USA
[7] Univ Texas MD Anderson Canc Ctr, Dept Invest Canc Therapeut, Phase Program 1, Houston, TX 77030 USA