1 Department of Histopathology, Royal Brompton and Harefield National Health Service Foundation Trust, National Heart and Lung Institute, Imperial College London, London, United Kingdom. Electronic address: a.nicholson@rbht.nhs.uk.
2 Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York.
3 MESOPATH Centre, Leon Berard Cancer Institute, Lyon, France.