title: Impact of clarithromycin resistance and CYP2C19 genetic polymorphism on treatment efficacy of Helicobacter pylori infection with lansoprazole- or rabeprazole-based triple therapy in Japan.
abstract: OBJECTIVE
  Helicobacter pylori treatment failure is thought to be due mainly to polymorphic cytochrome P450 2C19 (CPY2C19) genetic polymorphism, associated with proton pump inhibitor metabolism, and antimicrobial susceptibility. This report has ascertained which was more important, CPY2C19 polymorphism or antimicrobial susceptibility, when using 1-week lansoprazole-based or rabeprazole-based triple therapy in Japan.
  
  
  METHODS
  An open, randomized, parallel group study.
  
  
  METHODS
  One hundred and forty-five subjects with H. pylori-positive gastritis or peptic ulcers were randomly assigned to receive 30 mg lansoprazole twice daily (LAC group), 10 mg rabeprazole twice daily (RAC20 group), or 20 mg rabeprazole twice daily (RAC40 group), with 1000 mg amoxicillin twice daily and 400 mg clarithromycin twice daily for 1 week. Antimicrobial resistance testing was performed by E-test. More than 4 weeks after completion of treatment, H. pylori status was assessed by 13C-urea breath test, histology, and culture.
  
  
  RESULTS
  Cure rates expressed as intention-to-treat and per-protocol analyses, respectively, were 79.6 and 83.0% with LAC, 85.4 and 89.1% with RAC20, and 83.3 and 88.9% with RAC40. In the case of clarithromycin-sensitive strains, the cure rates were more than 97%, regardless of CPY2C19 polymorphism. However, treatment succeeded in only one out of 16 clarithromycin-resistant strains.
  
  
  CONCLUSIONS
  The key to successful eradication of H. pylori, using lansoprazole or rabeprazole with clarithromycin and amoxicillin, is clarithromycin susceptibility, not CPY2C19 polymorphism.
authors.affiliation: Division of Diabetes, Digestive and Kidney Diseases, Department of Clinical Molecular Medicine, Kobe University School of Medicine, Kobe, Japan.
authors.forename: Ikuya
authors.initials: I
authors.lastname: Miki
authors.forename: Nobuo
authors.initials: N
authors.lastname: Aoyama
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Sakai
authors.forename: Daisuke
authors.initials: D
authors.lastname: Shirasaka
authors.forename: Casmir Marwa
authors.initials: CM
authors.lastname: Wambura
authors.forename: Shuji
authors.initials: S
authors.lastname: Maekawa
authors.forename: Kohei
authors.initials: K
authors.lastname: Kuroda
authors.forename: Takao
authors.initials: T
authors.lastname: Tamura
authors.forename: Tomoko
authors.initials: T
authors.lastname: Kita
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Sakaeda
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Okumura
authors.forename: Masato
authors.initials: M
authors.lastname: Kasuga
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000328:Adult; D000368:Aged; D000658:Amoxicillin / Q000627:therapeutic use; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D000897:Anti-Ulcer Agents / Q000627:therapeutic use; D001189:Aryl Hydrocarbon Hydroxylases / Q000235:genetics*; D001562:Benzimidazoles / Q000627:therapeutic use; D017291:Clarithromycin / Q000627:therapeutic use*; D065731:Cytochrome P-450 CYP2C19; D024881:Drug Resistance, Bacterial / Q000235:genetics; D004359:Drug Therapy, Combination; D005260:Female; D005756:Gastritis / Q000382:microbiology; D016481:Helicobacter Infections / Q000150:complications / Q000188:drug therapy* / Q000235:genetics; D016480:Helicobacter pylori / Q000187:drug effects* / Q000235:genetics; D006801:Humans; D064747:Lansoprazole; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D006899:Mixed Function Oxygenases / Q000235:genetics*; D009853:Omeprazole / Q000031:analogs & derivatives / Q000627:therapeutic use; D010437:Peptic Ulcer / Q000382:microbiology; D011110:Polymorphism, Genetic; D054328:Proton Pump Inhibitors; D064750:Rabeprazole; D017211:Treatment Failure; D016896:Treatment Outcome
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000900:Anti-Bacterial Agents; D000897:Anti-Ulcer Agents; D001562:Benzimidazoles; D054328:Proton Pump Inhibitors; D064747:Lansoprazole; D064750:Rabeprazole; D000658:Amoxicillin; D006899:Mixed Function Oxygenases; D001189:Aryl Hydrocarbon Hydroxylases; C045793:CYP2C19 protein, human; D065731:Cytochrome P-450 CYP2C19; D017291:Clarithromycin; D009853:Omeprazole