1 Cancer Genome Evolution Research Group, University College London Cancer Institute, University College London, London, UK.
2 Cancer Evolution and Genome Instability Laboratory, Francis Crick Institute, London NW1 1AT, UK.
3 Francis Crick Institute, London, UK.
4 Cancer Research UK Lung Cancer Centre of Excellence, University College London Cancer Institute, University College London, London, UK; Cancer Evolution and Genome Instability Laboratory, Francis Crick Institute, London NW1 1AT, UK; University College London Hospitals NHS Trust, London, UK. Electronic address: charles.swanton@crick.ac.uk.