title: Pharmacogenetics of esomeprazole or rabeprazole-based triple therapy in Helicobacter pylori eradication in Hong Kong non-ulcer dyspepsia Chinese subjects.
abstract: OBJECTIVE
  Our study aimed to assess the effectiveness of esomeprazole or rabeprazole in combination with amoxicillin and clarithromycin for the eradication of Helicobacter pylori in Hong Kong non-ulcer dyspepsia (NUD) patients.
  
  
  METHODS
  A prospective clinical trial was conducted at the Alice Ho Miu ling Nethersole Hospital outpatient endoscopy center from June 2004 to December 2005. Participants received amoxicillin 1 g, clarithromycin 500 mg, and, esomeprazole 20 mg (EAC) or rabeprazole 20 mg (RAC), all given twice daily for 1 week. The H. pylori status was determined by the [13C] urea breath test at least 4 weeks after completion of the treatment. Mutation status of CYP2C19 in exon 4 and exon 5 associated with the poor metabolizer phenotype was determined.
  
  
  RESULTS
  The intention-to-treat eradication rates in patients treated with RAC and EAC were 77% and 84.6% respectively, and per protocol-based eradication rates were 83.7% and 88.9% respectively. The eradication rates did not vary with CYP2C19 phenotype found. For clarithromycin-sensitive strains, the cure rates were statistically significant regardless of CYP2C19 polymorphism (P < 0.0001).
  
  
  CONCLUSIONS
  Triple therapy with either EAC or RAC is effective for Hong Kong Chinese NUD patients with H. pylori infection. Success eradication was related to clarithromycin resistance and not CYP2C19 genotype.
authors.affiliation: School of Pharmacy, The Chinese University of Hong Kong, Hong Kong, China. vivianlee@cuhk.edu.hk
authors.forename: V W Y
authors.initials: VW
authors.lastname: Lee
authors.forename: T S
authors.initials: TS
authors.lastname: Chau
authors.forename: A K W
authors.initials: AK
authors.lastname: Chan
authors.forename: K K C
authors.initials: KK
authors.lastname: Lee
authors.forename: M M Y
authors.initials: MM
authors.lastname: Waye
authors.forename: T K W
authors.initials: TK
authors.lastname: Ling
authors.forename: F K L
authors.initials: FK
authors.lastname: Chan
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles / Q000008:administration & dosage / Q000627:therapeutic use*; D000328:Adult; D000658:Amoxicillin / Q000008:administration & dosage / Q000627:therapeutic use; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D000897:Anti-Ulcer Agents / Q000008:administration & dosage / Q000627:therapeutic use; D001189:Aryl Hydrocarbon Hydroxylases / Q000235:genetics; D044466:Asian People / Q000235:genetics; D001944:Breath Tests / Q000379:methods; D017291:Clarithromycin / Q000008:administration & dosage / Q000627:therapeutic use; D065731:Cytochrome P-450 CYP2C19; D024881:Drug Resistance, Bacterial; D004415:Dyspepsia / Q000188:drug therapy / Q000382:microbiology; D064098:Esomeprazole / Q000008:administration & dosage / Q000627:therapeutic use*; D005260:Female; D016481:Helicobacter Infections / Q000188:drug therapy* / Q000382:microbiology; D016480:Helicobacter pylori / Q000187:drug effects / Q000302:isolation & purification; D006723:Hong Kong; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation; D010597:Pharmacogenetics; D011110:Polymorphism, Genetic; D011446:Prospective Studies; D064750:Rabeprazole; D014508:Urea / Q000378:metabolism
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000900:Anti-Bacterial Agents; D000897:Anti-Ulcer Agents; D064750:Rabeprazole; D000658:Amoxicillin; D014508:Urea; D001189:Aryl Hydrocarbon Hydroxylases; C045793:CYP2C19 protein, human; D065731:Cytochrome P-450 CYP2C19; D017291:Clarithromycin; D064098:Esomeprazole