MicroRNA expression differentiates between primary lung tumors and metastases to the lung

Iris Barshack, Gila Lithwick-Yanai, Arnon Afek, Kinneret Rosenblatt, Hila Tabibian-Keissar, Merav Zepeniuk, Lahav Cohen, Harel Dan, Orit Zion, Yulia Strenov, Sylvie Polak-Charcon, Marina Perelman

Research output: Contribution to journalArticlepeer-review

70 Scopus citations


For surgical pathologists, distinguishing whether a pulmonary neoplasm is primary or metastatic can be challenging, and current biomarkers do not always aid lung tumor classification. The tissue-associated expression of microRNA likely explains the remarkable finding that many tumors can be classified based solely on their microRNA expression signature. Here we show that microRNAs can serve as biomarkers for lung tumor classification. Using microRNA microarray data generated from 76 formalin-fixed, paraffin-embedded (FFPE) samples of either primary lung cancer or metastatic tumors to the lung, we have identified a set of microRNAs expressed differentially between these two groups. This set includes hsa-miR-182, which was most strongly over-expressed in the lung primary tumors, and hsa-miR-126, which was over-expressed in the metastatic tumors. The differential expression of this set of microRNAs was confirmed using qRT-PCR on a set of 54 samples. In light of our data, microRNA expression should be considered as a potential clinical biomarker for surgical pathologists faced with discerning the tumor type of an inscrutable lung neoplasm.

Original languageEnglish
Pages (from-to)578-584
Number of pages7
JournalPathology Research and Practice
Issue number8
StatePublished - Aug 2010
Externally publishedYes


  • Hsa-miR-126
  • Hsa-miR-182
  • Lung cancer
  • MicroRNA


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