[1] Univ Zurich Hosp, CH-8091 Zurich, Switzerland
[2] Inst Gustave Roussy, Villejuif, France
[3] Mem Sloan Kettering Canc Ctr, New York, NY 10021 USA
[4] Vanderbilt Ingram Canc Ctr, Nashville, TN USA
[5] Churchill Hosp, Oxford OX3 7LJ, England
[6] Odense Univ Hosp, DK-5000 Odense, Denmark
[7] AstraZeneca, Macclesfield, Cheshire, England
[8] Univ Pittsburgh, Inst Canc, Pittsburgh, PA USA