Authors:
JMJ Weaver, CS Ross-Innes, N Shannon, AG Lynch, T Forshew, M Barbera, M Murtaza, C-AJ Ong, P Lao-Sirieix, MJ Dunning, L Smith, ML Smith, CL Anderson, B Carvalho, M O'Donovan, TJ Underwood, AP May, N Grehan, R Hardwick, J Davies, A Oloumi, S Aparicio, C Caldas, MD Eldridge, PAW Edwards, N Rosenfeld, S Tavaré, RC Fitzgerald, OCCAMS consortium
Journal name: 
Nat Genet
Citation info: 
46(8):837-843
Abstract: 
Cancer genome sequencing studies have identified numerous driver genes, but the relative timing of mutations in carcinogenesis remains unclear. The gradual progression from premalignant Barrett's esophagus to esophageal adenocarcinoma (EAC) provides an ideal model to study the ordering of somatic mutations. We identified recurrently mutated genes and assessed clonal structure using whole-genome sequencing and amplicon resequencing of 112 EACs. We next screened a cohort of 109 biopsies from 2 key transition points in the development of malignancy: benign metaplastic never-dysplastic Barrett's esophagus (NDBE; n=66) and high-grade dysplasia (HGD; n=43). Unexpectedly, the majority of recurrently mutated genes in EAC were also mutated in NDBE. Only TP53 and SMAD4 mutations occurred in a stage-specific manner, confined to HGD and EAC, respectively. Finally, we applied this knowledge to identify high-risk Barrett's esophagus in a new non-endoscopic test. In conclusion, mutations in EAC driver genes generally occur exceptionally early in disease development with profound implications for diagnostic and therapeutic strategies.
DOI: 
http://doi.org/10.1038/ng.3013
Research group: 
Caldas Group, Rosenfeld Group, Tavaré Group
E-pub date: 
31 Aug 2014