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Cytochrome P450 2C19 polymorphism influences the preventive effect of lansoprazole on the recurrence of erosive reflux esophagitis
Author(s) -
Kawamura Masashi,
Ohara Shuichi,
Koike Tomoyuki,
Iijima Katsunori,
Suzuki Hitoshi,
Kayaba Shoichi,
Noguchi Kenji,
Abe Shinya,
Noguchi Mitsunori,
Shimosegawa Toru
Publication year - 2007
Publication title -
journal of gastroenterology and hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.214
H-Index - 130
eISSN - 1440-1746
pISSN - 0815-9319
DOI - 10.1111/j.1440-1746.2006.04419.x
Subject(s) - lansoprazole , cyp2c19 , medicine , gastroenterology , helicobacter pylori , omeprazole , esophagitis , reflux esophagitis , reflux , genotype , cytochrome p450 , disease , gene , biochemistry , chemistry , metabolism
Background: The efficacy of lansoprazole (LPZ) at inhibiting gastric acid secretion is influenced by cytochrome P450 2C19 (CYP2C19) polymorphism. The purpose of the present study was to investigate whether CYP2C19 polymorphism had an influence on the remission of erosive reflux esophagitis (RE) during maintenance therapy with LPZ. Methods: Eighty‐two Japanese patients with initial healing of erosive RE by 8 weeks of LPZ therapy were enrolled. As maintenance therapy, the patients were treated with LPZ (15 mg/day) for 6 months. The CYP2C19 genotype, Helicobacter pylori infection status, and serum pepsinogen (PG) I/II ratio were assessed before treatment. The patients were investigated for relapse by endoscopy at 6 months or when symptoms recurred. Results: The proportion of patients in remission after 6 months was 61.5%, 78.0%, and 100% among homozygous extensive metabolizers (homo‐EM), heterozygous EM (hetero‐EM), and poor metabolizers (PM), respectively. The percentage of PM patients who remained in remission was significantly higher than that of homo‐EM or hetero‐EM. Conclusions: The efficacy of LPZ (15 mg/day) as maintenance therapy for erosive RE is influenced by CYP2C19 polymorphism.