C Swanton1, P Boffetta2, R Peston3, J-C Soria4. 1. Francis Crick Institute, London UCL Cancer Institute and Hospitals, London, UK charles.swanton@crick.ac.uk. 2. Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, USA. 3. ITN, London, UK. 4. Gustave Roussy and South-Paris University, Paris, France.