Innate Genetic Evolution of Lung Cancers and Spatial Heterogeneity: Analysis of Treatment-Naïve Lesions

Kenichi Suda, Jihye Kim, Isao Murakami, Leslie Rozeboom, Masaki Shimoji, Shigeki Shimizu, Christopher J. Rivard, Tetsuya Mitsudomi, Aik Choon Tan, Fred R. Hirsch

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Introduction: Data regarding the pre-treatment intertumor heterogeneity of potential biomarkers in advanced-stage lung cancers is limited. A finding of such heterogeneity between primary and metastatic lesions would prove valuable to determine if a metastatic lesion can be a surrogate for the primary tumor, as more biomarkers will likely be used in the future to inform treatment decisions. Methods: We performed RNA sequencing to analyze intertumor heterogeneity in 30 specimens (primary tumors, intrathoracic, and extrathoracic metastatic lesions) obtained from five treatment-naïve lung cancer patients. Results: The global unsupervised clustering analysis showed that the lesions clustered at the individual patient level rather than on the metastatic sites, suggesting that the characteristics of specific tumor cells have a greater impact on the gene expression signature than the microenvironment in which the metastasis develops. The mutational and transcriptional data highlight the presence of intertumor heterogeneity showing that the primary tumors are usually distinct from metastatic lesions. Through a comparison between metastatic lesions and the primary tumors, we observed that pathways related to cell proliferation were upregulated, whereas immune-related pathways were downregulated in metastatic lesions. Conclusion: These data not only provide insight into the evolution of lung cancers, but also imply possibilities and limitations of biomarker-based treatment in lung cancers.

Original languageEnglish
Pages (from-to)1496-1507
Number of pages12
JournalJournal of Thoracic Oncology
Volume13
Issue number10
DOIs
Publication statusPublished - 2018 Oct

Keywords

  • Autopsy
  • Biomarkers
  • Immune-related markers
  • RET fusion
  • RNA sequencing
  • Tumor heterogeneity

ASJC Scopus subject areas

  • Oncology
  • Pulmonary and Respiratory Medicine

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