Identification of microRNAs differentially expressed between lung squamous cell carcinoma and lung adenocarcinoma

Junko Hamamoto, Kenzo Soejima, Satoshi Yoda, Katsuhiko Naoki, Sohei Nakayama, Ryosuke Satomi, Hideki Terai, Shinnosuke Ikemura, Takashi Sato, Hiroyuki Yasuda, Yuichiro Hayashi, Michiie Sakamoto, Toru Takebayashi, Tomoko Betsuyaku

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Recent advances in the treatment of non-small cell lung cancer (NSCLC) with new agents require accurate histological subtyping at diagnosis to avoid the higher risk of an adverse response and to obtain the maximum therapeutic response. However, interobserver variability, tumor heterogeneity and the degree of differentiation may affect the decision concerning a pathological diagnosis of NSCLC. Therefore, the aim of this study was to identify specific microRNAs (miRNAs) as standardized biomarkers with high sensitivity and specificity in order to distinguish between squamous cell carcinoma (SCC) and adenocarcinoma (AC). Quantitative polymerase chain reaction (qPCR)-based miRNA array analysis was performed to identify microRNAs differentially expressed between SCC and AC using 86 resected NSCLC samples in addition to adjacent normal tissues. The results were confirmed by independent qRT-PCR assays with the same test samples and 88 additional validation samples, and from this we evaluated the usefulness of the identified miRNAs as biomarkers to distinguish between SCC and AC. Three miRNAs (hsa-miR-196b, hsa-miR-205 and hsa-miR-375) were identified. Discriminant analysis combining the three miRNAs appeared to distinguish SCC from AC accurately in the test and validation samples, demonstrating a sensitivity and specificity of 76 and 80%, and 85 and 83%, respectively. hsa-miR-196b, hsa-miR-205 and hsa-miR-375 were identified as biomarkers capable of distinguishing between lung SCC and lung AC. These newly identified miRNAs may prove to be highly valuable molecular markers for the classification of NSCLC histological subtypes and may contribute to the pathogenesis of each subtype of NSCLC.

Original languageEnglish
Pages (from-to)456-462
Number of pages7
JournalMolecular Medicine Reports
Volume8
Issue number2
DOIs
Publication statusPublished - 2013 Aug 1

Keywords

  • Adenocarcinoma
  • Biomarker
  • Lung cancer
  • MicroRNA
  • Squamous cell carcinoma

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Genetics
  • Oncology
  • Cancer Research

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