title: Osteopontin expression is associated with platinum-based chemotherapy response and prognosis of patients with advanced non small cell lung cancer.
abstract: OBJECTIVE
  To examine the expression of osteopontin (OPN) in patients with advanced non-small cell lung cancer (NSCLC), and to analyze the correlation of the expression level of OPN with response to platinum-based chemotherapy and the prognosis of NSCLC patients.
  
  
  METHODS
  This retrospective study enrolled 92 patients with advanced NSCLC. All of the patients received platinum- based regimens as first-line chemotherapy. The expression of OPN in advanced NSCLC tissue was detected by immunohistochemistry. The associations between OPN expression with response to chemotherapy and the prognosis were analyzed by SPSS 17.0 statistical software.
  
  
  RESULTS
  The positive expression rate of OPN in advanced NSCLC tissue was 36.9% (34/92). The positive expression rate of OPN was higher in patients ≥70 years old (65.2%;15/23) vs those aged <70 years (27.5%;19/69; p<0.05), which was also higher in patients with distant metastasis (51.9%;28/54) than that in patients without metastasis 15.8% (6/38) , the difference with statistically significant (p<0.05). Pearson's correlation analysis results showed that OPN expression was significantly correlated with age (r=0.338, p=0.001) , distant metastasis (r=0.368, p<0.001), curative effect of platinum-based regimen (r=0.403, p<0.001), progression-free survival/PFS (r=-0.486, p<0.001) and overall survival/OS (r=-0.552, p<0.001). Furthermore, the OPN expression was an independent predictor of PFS and OS for patients with advanced NSCLC after receiving platinum-based first-line chemotherapy (p<0.001).
  
  
  CONCLUSIONS
  OPN expression is an independent predictor of response to platinum-based first-line chemotherapy and of the prognosis of patients with advanced NSCLC.
authors.affiliation: Department of Oncology, The First Hospital of Lanzhou University, Lanzhou, Chin.
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.forename: Dong-ming
authors.initials: DM
authors.lastname: Zhang
authors.forename: Da
authors.initials: D
authors.lastname: Zhao
authors.forename: Xiao-ming
authors.initials: XM
authors.lastname: Hou
authors.forename: Tian-ning
authors.initials: TN
authors.lastname: Yang
mesh_terms: D000328:Adult; D000368:Aged; D002289:Carcinoma, Non-Small-Cell Lung / Q000188:drug therapy* / Q000401:mortality / Q000473:pathology; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008175:Lung Neoplasms / Q000188:drug therapy* / Q000401:mortality / Q000473:pathology; D008297:Male; D008875:Middle Aged; D053495:Osteopontin / Q000032:analysis*; D010984:Platinum / Q000627:therapeutic use; D011379:Prognosis; D012189:Retrospective Studies
chemical_list: D053495:Osteopontin; D010984:Platinum