title: [Expression of multidrug resistance-associated protein in human non-small cell lung cancer].
abstract: OBJECTIVE
  To investigate the expression of the multidrug resistance-associated protein(MRP) gene and MRP in human non-small-cell lung cancer tissues and to determine whether such expression was related to cell type, differentiation, tumour size, lymph node metastasis and prognosis.
  
  
  METHODS
  92 paraffin-embeded lung tumor samples (43 squamous cell carcinoma, 49 adenocarcinoma) and 16 fresh non-small-cell lung cancer samples were examined by using immunohistochemistry method and the reverse transcription-polymerase chain reaction (RT-PCR) technology respectively.
  
  
  RESULTS
  The expression of MRP mRNA and MRP were detectable in 31% (5-16) and 54% (50/92) of non-small-cell lung cancer specimens respectively. Eighteen(42%) squamous cell carcinoma specimens and thirty-two(65%) adenocarcinoma specimens showed positive immunostaining for MRP(P < 0.05). The expression of MRP was not related to tumour size, lymph node metastasis and cell differentiation significantly(P > 0.05). The five-year survival rate after operation of patients with MRP-positive tumours and MRP-negative tumours were 16% (8/50), 52% (22/42) respectively. Patients with MRP-positive tumours had shorter survival time than the MRP-negative patients significantly(P < 0.01).
  
  
  CONCLUSIONS
  Adenocarcinoma had higher MRP expression than squamous carcinoma significantly, positive MRP immunostaining appears to be an independent indicator of poor prognosis in NSCLC.
authors.affiliation: Dept. of Medical Oncology, Cancer Hospital, CAMS, PUMC, Beijing 100021.
authors.forename: X
authors.initials: X
authors.lastname: Peng
authors.forename: F
authors.initials: F
authors.lastname: Feng
authors.forename: W
authors.initials: W
authors.lastname: Zhang
mesh_terms: D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor / Q000096:biosynthesis*; D002289:Carcinoma, Non-Small-Cell Lung / Q000378:metabolism* / Q000401:mortality; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008175:Lung Neoplasms / Q000378:metabolism* / Q000401:mortality; D008297:Male; D008875:Middle Aged; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000096:biosynthesis*; D016133:Polymerase Chain Reaction; D011379:Prognosis
chemical_list: D014408:Biomarkers, Tumor; D027425:ATP-Binding Cassette, Sub-Family C Proteins