OBJECTIVES: Omeprazole is used for the treatment of infection caused by Helicobacter pylori, and it is metabolized by the polymorphic cytochrome P4502C19 (CYP2C19). We have found that the anti-H pylori efficacy by the combination of omeprazole and antibiotics is related to the CYP2C19 genotype. METHODS: One hundred eight patients with cultured H pylori-positive gastritis or peptic ulcer were treated with three regimens: quadruple treatment without proton pump inhibitors (n = 25), dual treatment with omeprazole and amoxicillin (INN, amoxicilline) (n = 26), and triple treatment with omeprazole, amoxicillin, and clarithromycin (n = 57). The CYP2C19 genotype was determined by the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method and the assessment of the eradication of H pylori was based on all negative examinations, including culture, histology, and 13C-urea breath test. RESULTS: The eradication rates for the extensive metabolizers were 50% and 86% for the dual and triple treatments, respectively. In contrast, all of the poor metabolizers treated with omeprazole and antibiotics (n = 15) showed an eradication of H pylori. CONCLUSION: The anti-H pylori effect of dual treatment is highly efficient for CYP2C19 poor metabolizers, which suggests that clarithromycin is not necessary as a first line of therapy for this type of patients. Genotyping can provide a choice for the optimal regimen based on individual CYP2C19 genotype.
OBJECTIVES:Omeprazole is used for the treatment of infection caused by Helicobacter pylori, and it is metabolized by the polymorphic cytochrome P4502C19 (CYP2C19). We have found that the anti-H pylori efficacy by the combination of omeprazole and antibiotics is related to the CYP2C19 genotype. METHODS: One hundred eight patients with cultured H pylori-positive gastritis or peptic ulcer were treated with three regimens: quadruple treatment without proton pump inhibitors (n = 25), dual treatment with omeprazole and amoxicillin (INN, amoxicilline) (n = 26), and triple treatment with omeprazole, amoxicillin, and clarithromycin (n = 57). The CYP2C19 genotype was determined by the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method and the assessment of the eradication of H pylori was based on all negative examinations, including culture, histology, and 13C-urea breath test. RESULTS: The eradication rates for the extensive metabolizers were 50% and 86% for the dual and triple treatments, respectively. In contrast, all of the poor metabolizers treated with omeprazole and antibiotics (n = 15) showed an eradication of H pylori. CONCLUSION: The anti-H pylori effect of dual treatment is highly efficient for CYP2C19 poor metabolizers, which suggests that clarithromycin is not necessary as a first line of therapy for this type of patients. Genotyping can provide a choice for the optimal regimen based on individual CYP2C19 genotype.
Authors: J Rosemary; C Adithan; N Padmaja; C H Shashindran; N Gerard; R Krishnamoorthy Journal: Eur J Clin Pharmacol Date: 2005-01-21 Impact factor: 2.953
Authors: T Sakai; N Aoyama; T Kita; T Sakaeda; K Nishiguchi; Y Nishitora; T Hohda; D Sirasaka; T Tamura; Y Tanigawara; M Kasuga; K Okumura Journal: Pharm Res Date: 2001-06 Impact factor: 4.200
Authors: T Kita; Y Tanigawara; N Aoyama; T Hohda; Y Saijoh; F Komada; T Sakaeda; K Okumura; T Sakai; M Kasuga Journal: Pharm Res Date: 2001-05 Impact factor: 4.200
Authors: Josip Bago; Anita Galović; Zeljka Belosić Halle; A Bilić; M Bevanda; Petra Bago Journal: Wien Klin Wochenschr Date: 2004-07-31 Impact factor: 1.704