title: LRIG1 is a prognostic biomarker in non-small cell lung cancer.
abstract: BACKGROUND
  The leucine-rich repeats and immunoglobulin-like domains (LRIG) family of transmembrane proteins are involved in the regulation of cellular signal transduction. LRIG1 is an endogenous inhibitor of receptor tyrosine kinases (RTKs) and an emerging tumor suppressor. In the lung epithelium, the expression of LRIG1 is downregulated by tobacco smoking, and further downregulated in lung squamous cell carcinoma.
  
  
  METHODS
  The expression of LRIG proteins were analyzed in 347 cases of non-small cell lung cancer (NSCLC) by immunohistochemistry, and LRIG1 mRNA expression was evaluated in 807 lung cancer samples in silico in the Oncomine database. Potential associations between the expression data and the clinical parameters, including patient survival, were investigated.
  
  
  RESULTS
  Expression of the LRIG1 protein was found to be an independent prognostic factor in NSCLC, whereas expression of LRIG2 or LRIG3 did not correlate with patient survival. The levels of LRIG1 mRNA also correlated with the survival of NSCLC patients.
  
  
  CONCLUSIONS
  These findings demonstrate that LRIG1 is an independent prognostic factor in patients with NSCLC that could be important in future decision-making algorithms for adjuvant lung cancer treatment.
authors: a Department of Radiation Sciences , Oncology, Umeå University , Umeå , Sweden.
authors: Samuel
authors: S
authors: Kvarnbrink
authors: Terese
authors: T
authors: Karlsson
authors: Karolina
authors: K
authors: Edlund
authors: Johan
authors: J
authors: Botling
authors: David
authors: D
authors: Lindquist
authors: Karin
authors: K
authors: Jirström
authors: Patrick
authors: P
authors: Micke
authors: Roger
authors: R
authors: Henriksson
authors: Mikael
authors: M
authors: Johansson
authors: Håkan
authors: H
authors: Hedman
mesh_terms: D000368:Aged; D014408:Biomarkers, Tumor / Q000032:analysis*; D002289:Carcinoma, Non-Small-Cell Lung / Q000401:mortality / Q000473:pathology*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D053208:Kaplan-Meier Estimate; D008175:Lung Neoplasms / Q000401:mortality / Q000473:pathology*; D008297:Male; D008562:Membrane Glycoproteins / Q000032:analysis / Q000096:biosynthesis*; D011379:Prognosis; D046888:Tissue Array Analysis
chemical_list: D014408:Biomarkers, Tumor; C484445:LRIG1 protein, human; D008562:Membrane Glycoproteins