Laurent Sansregret1 and Charles Swanton1,2 1Translational Cancer Therapeutics Laboratory, The Francis Crick Institute, Lincoln's Inn Fields Laboratories, London WC2A 3LY, United Kingdom 2CRUK Lung Cancer Centre of Excellence/UCL Cancer Institute, London WC1E 6BT, United Kingdom Correspondence: Charles.Swanton{at}crick.ac.uk