title: Lipoprotein receptor associated protein (LRPAP1) insertion/deletion polymorphism: association with gallbladder cancer susceptibility.
abstract: BACKGROUND
  Low-density lipoprotein receptor-related protein associated protein (LRPAP1) insertion/deletion polymorphism influences cholesterol homeostasis and may confer risk for gallstone disease and gallbladder carcinoma (GBC) incidence usually parallels with the prevalence of cholelithiosis.
  
  
  OBJECTIVE
  We aimed to examine the role of LRPAP1 polymorphism in susceptibility to GBC.
  
  
  METHODS
  Present case control study included 129 proven GBC patients, 183 gallstone patients, and 208 healthy controls. Genotyping was done by polymerase chain reaction-restriction fragment length polymorphism method.
  
  
  RESULTS
  The D allele of LRPAP1 was significantly higher in GBC patients as compared to gallstone patients (p = 0.013; OR = 1.6, 95% CI = 1.1-2.4). However, II genotype and I allele was associated with reduced risk of GBC as compared to gallstone patients (p = 0.002; OR = 0.1, 95% CI = 0.1-0.6; p = 0.013; OR = 0.6, 95% CI = 0.4-0.8) The increased risk due to D allele was limited to female GBC patients (p = 0.021; OR = 1.8, 95% CI = 1.1-3.0). However, reduced risk due to II genotype and I allele was observed which was also confined to female GBC patients (p = 0.005; OR = 0.1, 95% CI = 0.1-0.6; p = 0.021; OR = 0.5, 95% CI = 0.3-0.8). On comparing GBC patients having gallstone with gallstone patients, high risk was observed in the GBC patients having gallstone due to the presence of D allele (p = 0.032; OR = 1.7, 95% CI = 1.0-2.8). However, low risk was observed because of I allele in GBC patients with gallstone in comparison to gallstone patients (p = 0.032, OR = 0.6, 95% CI = 0.4-0.9).
  
  
  CONCLUSIONS
  It appears that 'D' allele may modulate the susceptibility of GBC, and the risk is independent to genetic risk of gallstone.
authors.affiliation: Department of Genetics, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India.
authors.forename: Sachchida Nand
authors.initials: SN
authors.lastname: Pandey
authors.forename: Manjusha
authors.initials: M
authors.lastname: Dixit
authors.forename: Gourdas
authors.initials: G
authors.lastname: Choudhuri
authors.forename: Balraj
authors.initials: B
authors.lastname: Mittal
mesh_terms: D016022:Case-Control Studies; D005260:Female; D005704:Gallbladder / Q000378:metabolism / Q000473:pathology; D005706:Gallbladder Neoplasms / Q000453:epidemiology / Q000235:genetics* / Q000473:pathology; D042882:Gallstones / Q000453:epidemiology / Q000235:genetics* / Q000473:pathology; D020022:Genetic Predisposition to Disease; D006801:Humans; D007194:India / Q000453:epidemiology; D026563:LDL-Receptor Related Protein-Associated Protein / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D016254:Mutagenesis, Insertional / Q000235:genetics*; D009367:Neoplasm Staging; D011110:Polymorphism, Genetic / Q000235:genetics*; D011379:Prognosis; D012307:Risk Factors; D017384:Sequence Deletion
chemical_list: D026563:LDL-Receptor Related Protein-Associated Protein