[1] Univ London St Bartholomews Hosp Med Coll, Imperial Canc Res Technol, London EC1A 7BE, England
[2] Univ London St Bartholomews Hosp Med Coll, Imperial Canc Res Fund, Nucl Med Grp, London EC1A 7BE, England
[3] Imperial Canc Res Fund, Dept Histopathol, London, England
[4] Univ Oxford, Inst Mol Med, ICRF Canc & Immunogenet Lab, Oxford OX1 2JD, England