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01.12.2018 | Research article | Ausgabe 1/2018 Open Access

BMC Cancer 1/2018

Impact of viral presence in tumor on gene expression in non-small cell lung cancer

Zeitschrift:
BMC Cancer > Ausgabe 1/2018
Autoren:
Youngchul Kim, Christine M. Pierce, Lary A. Robinson
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1186/​s12885-018-4748-0) contains supplementary material, which is available to authorized users.

Abstract

Background

In our recent study, most non-small-lung cancer (NSCLC) tumor specimens harbored viral DNA but it was absent in non-neoplastic lung. However, their targets and roles in the tumor cells remain poorly understood. We analyzed gene expression microarrays to identify genes and pathways differentially altered between virus-infected and uninfected NSCLC tumors.

Methods

Gene expression microarrays of 30 primary and 9 metastatic NSCLC patients were preprocessed through a series of quality control analyses. Linear Models for Microarray Analysis and Gene Set Enrichment Analysis were used to assess differential expression.

Results

Various genes and gene sets had significantly altered expressions between virus-infected and uninfected NSCLC tumors. Notably, 22 genes on the viral carcinogenesis pathway were significantly overexpressed in virus-infected primary tumors, along with three oncogenic gene sets. A total of 12 genes, as well as seven oncogenic and 133 immunologic gene sets, were differentially altered in squamous cell carcinomas, depending on the virus. In adenocarcinoma, 14 differentially expressed genes (DEGs) were identified, but no oncogenic and immunogenic gene sets were significantly altered. In bronchioloalveolar carcinoma, several genes were highly overexpressed in virus-infected specimens, but not statistically significant. Only five of 69 DEGs (7.2%) from metastatic tumor analysis overlapped with 1527 DEGs from the primary tumor analysis, indicating differences in host cellular targets and the viral impact between primary and metastatic NSCLC.

Conclusions

The differentially expressed genes and gene sets were distinctive among infected viral types, histological subtypes, and metastatic disease status of NSCLC. These results support the hypothesis that tumor viruses play a role in NSCLC by regulating host genes in tumor cells during NSCLC differentiation and progression.
Zusatzmaterial
Additional file 1: Figure S1. Expression Patterns of 639 Genes Differentially Altered between all Virus-infected and Uninfected NSCLC Tumor Specimens. (PDF 163 kb)
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Additional file 2: Table S1. Top 10 Significant Genes with Differential Expression between Virus-infected and uninfected NSCLC Tumor Specimens . (PDF 197 kb)
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Additional file 3: Figure S2. Differentially-Expressed Genes between Virus-infected and Uninfected Primary NSCLC Tumors. (PDF 181 kb)
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Additional file 4: Figure S3. Viral Carcinogenesis (KEGG ID: hsa05203). (PDF 134 kb)
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Additional file 5: Figure S4. Gene Sets Enriched Significantly in All Primary NSCLC. (PDF 176 kb)
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Additional file 6: Figure S5. Expression Patterns of 12 Genes Differentially Expressed between Virus-infected and Uninfected Squamous Cell Carcinoma. (PDF 137 kb)
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Additional file 7: Figure S6. Differentially-Expressed Genes between Virus-infected and Uninfected Adenocarcinoma. (PDF 147 kb)
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Additional file 8: Figure S7. Gene Expression of Notch-signaling and CRX_NRS Gene sets in Bronchioloalveolar Carcinoma. (PDF 148 kb)
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Additional file 9: Figure S8. Differentially-Expressed Genes between Virus-infected and Uninfected Metastatic NSCLC. (PDF 129 kb)
12885_2018_4748_MOESM9_ESM.pdf
Literatur
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