title: [Clinical significance of multidrug resistance-associated protein(MRP) gene expression in non-small cell lung cancer].
abstract: OBJECTIVE
  To investigate expression of multidrug resistance-associated protein (MRP) in non-small cell lung cancer and its relation to histological type, TNM staging and prognosis.
  
  
  METHODS
  In situ hybridization was used to examine mRNA expression of MRP.
  
  
  RESULTS
  The overall positive rate of MRP expression was 74.1%, with 73.3% and 72.0% in adenocarcinoma and squamous-cell carcinoma, respectively. The expression of MRP was not related to histological subtypes, TNM staging and cell differentiation. In 47 patients who received chemotherapy, 35 patients with positive MRP expression(+(-)++) showed worse prognosis than in those with negative expression (P < 0.05). The median survival time was 8.7 months and 21 months in patients with positive and negative MRP expession, respectively. In patients with squamous-cell carcinoma, the survival rate was significantly lower in patients (n = 12) with positive MRP expression than in those (n = 7) with negative MRP expression (P < 0.05). Their median survival time was 6 months and 19.5 months, respectively (P < 0.05).
  
  
  CONCLUSIONS
  The expression of MRP gene is negatively correlated with survival of patients with squamous-cell carcinoma, but not adenocarcinoma, who received chemotherapy.
authors.affiliation: School of Oncology, Beijing Medical University, Beijing 100036.
authors.forename: M
authors.initials: M
authors.lastname: Zhan
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: J
authors.initials: J
authors.lastname: Li
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002289:Carcinoma, Non-Small-Cell Lung / Q000378:metabolism* / Q000401:mortality; D005260:Female; D006801:Humans; D017403:In Situ Hybridization; D008175:Lung Neoplasms / Q000378:metabolism* / Q000401:mortality; D008297:Male; D008875:Middle Aged; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000235:genetics*; D011379:Prognosis; D015996:Survival Rate
chemical_list: D027425:ATP-Binding Cassette, Sub-Family C Proteins