title: [Clinical significance of the expression of lung resistance protein in non-small cell lung carcinomas].
abstract: OBJECTIVE
  To investigate the expression of the lung resistance-related protein (LRP) in non-small cell lung carcinomas (NSCLC) and evaluate its clinical significance.
  
  
  METHODS
  Using immunohistochemistry, LRP was examined in 69 NSCLC specimens obtained by either transbronchial biopsy via fibrobronchoscopy or transcutaneous needle biopsy or surgical resection. Of the 69 patients from whom tumor specimens were obtained, 52 were male and 17 were female.
  
  
  RESULTS
  LRP expression was detected in 39/69 (57%) tumor specimens. There was no correlation between LRP expression and NSCLC histological classification (P > 0.05). No significant differences were found in gender and among age groups. The positive rates of LRP were 67% (18/27), 55% (17/31), 52% (23/44), 64% (16/25), 83% (5/6), 57% (36/63) and 50% (3/6) in adenocarcinoma, squamous, staging T1-2, T3-4, N3, M0 and M1 respectively. It was shown that LRP expression was not associated with primary tumor size and metastasis status (N,M). NSCLC patients with positive LRP expression responded more poorly to chemotherapy than those with negative LRP expression (P < 0.05).
  
  
  CONCLUSIONS
  The frequencies of multidrug resistance caused by LRP are similar between adenocarcinoma and squamous. Expression of LRP is related to multidrug resistance of NSCLC, which in turn related to the efficacy and prognosis of chemotherapy. The examination of LRP expression may be valuable for choice of chemotherapy regimen.
authors.affiliation: Department of Oncology, Shanghai Pulmonary Hospital, Shanghai 200433, China.
authors.forename: M
authors.initials: M
authors.lastname: Lü
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: X
authors.initials: X
authors.lastname: Yi
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000032:analysis*; D002289:Carcinoma, Non-Small-Cell Lung / Q000737:chemistry* / Q000188:drug therapy; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008175:Lung Neoplasms / Q000737:chemistry* / Q000188:drug therapy; D008297:Male; D020394:Vault Ribonucleoprotein Particles; D000099187:Major Vault Protein
chemical_list: D018528:ATP-Binding Cassette Transporters; D020394:Vault Ribonucleoprotein Particles; D000099187:Major Vault Protein