[1] UCL Canc Inst, Canc Res UK & UCL Trials Ctr, London, England
[2] St James Univ Hosp, Oncol, Leeds LS9 7TF, W Yorkshire, England
[3] MRC, Clin Trials Unit, London, England
[4] Mt Vernon Canc Ctr, Oncol, Northwood, Middx, England
[5] Christie Hosp, Med Oncol, Manchester, Lancs, England
[6] Royal Marsden Hosp, Oncol, Sutton, Surrey, England
[7] Christchurch Hosp, Oncol, Christchurch, New Zealand
[8] Hamilton Reg Canc Ctr, Med Oncol, Hamilton, ON L8V 1C3, Canada