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Systematic pan-cancer analysis of tumour purity

Author

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  • Dvir Aran

    (Institute for Computational Health Sciences, University of California
    Stanford University)

  • Marina Sirota

    (Institute for Computational Health Sciences, University of California)

  • Atul J. Butte

    (Institute for Computational Health Sciences, University of California)

Abstract

The tumour microenvironment is the non-cancerous cells present in and around a tumour, including mainly immune cells, but also fibroblasts and cells that comprise supporting blood vessels. These non-cancerous components of the tumour may play an important role in cancer biology. They also have a strong influence on the genomic analysis of tumour samples, and may alter the biological interpretation of results. Here we present a systematic analysis using different measurement modalities of tumour purity in >10,000 samples across 21 cancer types from the Cancer Genome Atlas. Patients are stratified according to clinical features in an attempt to detect clinical differences driven by purity levels. We demonstrate the confounding effect of tumour purity on correlating and clustering tumours with transcriptomics data. Finally, using a differential expression method that accounts for tumour purity, we find an immunotherapy gene signature in several cancer types that is not detected by traditional differential expression analyses.

Suggested Citation

  • Dvir Aran & Marina Sirota & Atul J. Butte, 2015. "Systematic pan-cancer analysis of tumour purity," Nature Communications, Nature, vol. 6(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9971
    DOI: 10.1038/ncomms9971
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