title: The signature from messenger RNA expression profiling can predict lymph node metastasis with high accuracy for non-small cell lung cancer.
abstract: BACKGROUND
  The extent of regional lymph node (LN) metastasis is the most important factor in the evaluation of resectability and prognosis of non-small cell lung cancer (NSCLC) to increase the chance of complete cure. The authors attempted to deduce a group of genes from the analysis of mRNA expression profiles of the tumor tissues of NSCLC patients with or without LN metastasis, and make a classification model for better prediction of LN metastasis.
  
  
  METHODS
  The authors analyzed mRNA expression profiles of 79 NSCLC patients with or without LN metastasis, and deduced the gene signature for the predictive model of LN metastasis in lung cancer. The authors evaluated the predictive accuracy of each of four algorithms by applying them to another set of 33 NSCLC patients. Each algorithm's accuracy was calculated by 10-fold cross-validation, and a combined model showed a level of accuracy that was higher than any one of the better three component algorithms (i.e., ANN, DT, or NB). Avadis, SAS, ArrayXPath, and R-package were the statistical analysis software packages used.
  
  
  RESULTS
  The authors selected 949 genes using a classical permutation t test (p < 0.01) and finally obtained a gene signature consisting of 31 genes by adjustment of multiple-hypothesis testing. The LN metastasis prediction model derived from the signature (31 genes) and their characteristic interactions provided a predictive accuracy of 84.85% when applied to a test set of 33 patients.
  
  
  CONCLUSIONS
  The authors have demonstrated that their gene signature developed by the expression profiling of mRNAs from the primary tissue could predict the LN metastasis status of NSCLC.
authors.affiliation: Cancer Research Division, Center for Clinical Research, Samsung Biomedical Research Institute, Seoul, Korea.
authors.forename: Naeyun
authors.initials: N
authors.lastname: Choi
authors.forename: Dae-Soon
authors.initials: DS
authors.lastname: Son
authors.forename: Jinseon
authors.initials: J
authors.lastname: Lee
authors.forename: In-Seung
authors.initials: IS
authors.lastname: Song
authors.forename: Kyung-Ah
authors.initials: KA
authors.lastname: Kim
authors.forename: Sang-Ho
authors.initials: SH
authors.lastname: Park
authors.forename: Yoo-Sung
authors.initials: YS
authors.lastname: Lim
authors.forename: Gil-Ju
authors.initials: GJ
authors.lastname: Seo
authors.forename: Jungho
authors.initials: J
authors.lastname: Han
authors.forename: Hyejin
authors.initials: H
authors.lastname: Kim
authors.forename: Hye Won
authors.initials: HW
authors.lastname: Lee
authors.forename: Jason Jong-Ho
authors.initials: JJ
authors.lastname: Kang
authors.forename: Jeong-Sun
authors.initials: JS
authors.lastname: Seo
authors.forename: Ju Han
authors.initials: JH
authors.lastname: Kim
authors.forename: Jhingook
authors.initials: J
authors.lastname: Kim
mesh_terms: D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics / Q000556:secondary*; D020869:Gene Expression Profiling; D006801:Humans; D008175:Lung Neoplasms / Q000235:genetics / Q000473:pathology*; D008207:Lymphatic Metastasis / Q000235:genetics; D020411:Oligonucleotide Array Sequence Analysis; D012333:RNA, Messenger / Q000235:genetics*
chemical_list: D012333:RNA, Messenger