title: Clinical relationship between MDR1 gene and gallbladder cancer.
abstract: BACKGROUND
  The most common mechanisms of multidrug resistance (MDR) in cancer cells is the expression of an energy-dependent exfflux pump. P-glycoprotein (P-gp) encoded by MDR1 gene and multidrug associated protein (MRP) are well known proteins associated with MDR. In human cancers, the MDR1 gene expression is common in patients with intrinsic and acquired MDR. It is a major therapeutic problem in cancer chemotherapy. Previously we found that the MDR of HCC is related to MRP gene expression and initiates the intrinsic MDR. The aim of this study is to study the expression of MDR1 gene encoding P-gp and MDRl mRNA in primary gallbladder carcinoma, and analyze its clinical significance.
  
  
  METHODS
  Immunohistochemistry (IHC) S-P method and in situ polymerase chain reaction (ISPCR) were used to detect the expression of P-gp and MDR1 mRNA in 53 cases of untreated primary gallbladder carcinoma and 12 cases of cholecystitis (archival paraffin-embedded tissues).
  
  
  RESULTS
  The positive expression rates of P-gp and MDR1 mRNA in the 53 cases and 12 cases were 60.38%, 71.69% and 25.00%, 33.33%, respectively. There was a significant difference between the two groups (P<0.05). The positive expression rate of P-gp and MDR1mRNA were 69.44%, 83.33% and 41.18%, 47.06% respectively in tissues in stage of Nevin I-III against Nevin IV, V (P<0.05). In well, moderately differentiated gallbladder carcinoma tissues, their expressions were 79.49%, 69.23% against 50.00%, 35.71% in low, undifferentiated tissues (P<0.05).
  
  
  CONCLUSIONS
  MDR to gallbladder carcinoma is closely related to the intrinsic MDR and it provides an important evidence to reverse the MDR by detection of the MDR1 gene. Meanwhile, MDR1 gene expression in gallbladder carcinoma is correlated with some biological characteristics, takes part in the carcinogenesis of gallbladder tissues, and acts as a valuable biomarker of prognosis.
authors.affiliation: Third Department of Surgery, First Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou 510405, China. wbl672000@yahoo.com.cn
authors.forename: Bai-Lin
authors.initials: BL
authors.lastname: Wang
authors.forename: Hai-Ying
authors.initials: HY
authors.lastname: Zhai
authors.forename: Bing-Yi
authors.initials: BY
authors.lastname: Chen
authors.forename: Shu-Ping
authors.initials: SP
authors.lastname: Zhai
authors.forename: Hai-Yan
authors.initials: HY
authors.lastname: Yang
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Chen
authors.forename: Wen-Tao
authors.initials: WT
authors.lastname: Zhao
authors.forename: Lei
authors.initials: L
authors.lastname: Meng
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000096:biosynthesis / Q000235:genetics*; D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor / Q000235:genetics*; D002277:Carcinoma / Q000235:genetics* / Q000378:metabolism; D002471:Cell Transformation, Neoplastic / Q000235:genetics; D019008:Drug Resistance, Neoplasm / Q000235:genetics; D005260:Female; D005706:Gallbladder Neoplasms / Q000235:genetics* / Q000378:metabolism; D019450:Genes, MDR / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D012333:RNA, Messenger / Q000235:genetics
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D014408:Biomarkers, Tumor; D012333:RNA, Messenger