Collaborative research conducted by scientists within the Cancer Genome Atlas Research Network have identified significant mutations that can influence tumor subtype classification.
Published Online: July 10, 2014
Abstract: Adenocarcinoma of the lung is the leading cause of cancer death worldwide. Here we report molecular profiling of 230 resected lung adenocarcinomas using messenger RNA, microRNA and DNA sequencing integrated with copy number, methylation and proteomic analyses. High rates of somatic mutation were seen (mean 8.9 mutations per megabase). Eighteen genes were statistically significantly mutated, including RIT1
activating mutations and newly described loss-of-function MGA
mutations which are mutually exclusive with focal MYC
mutations were more frequent in female patients, whereas mutations in RBM10
were more common in males. Aberrations in NF1
occurred in 13% of cases and were enriched in samples otherwise lacking an activated oncogene, suggesting a driver role for these events in certain tumours. DNA and mRNA sequence from the same tumour highlighted splicing alterations driven by somatic genomic changes, including exon 14 skipping in MET
mRNA in 4% of cases. MAPK and PI(3)K pathway activity, when measured at the protein level, was explained by known mutations in only a fraction of cases, suggesting additional, unexplained mechanisms of pathway activation. These data establish a foundation for classification and further investigations of lung adenocarcinoma molecular pathogenesis.
Link to the paper: http://bit.ly/1oFV9OP