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15.09.2020 | Original Article―Alimentary Tract | Ausgabe 11/2020

Journal of Gastroenterology 11/2020

Vonoprazan-based triple therapy is effective for Helicobacter pylori eradication irrespective of clarithromycin susceptibility

Zeitschrift:
Journal of Gastroenterology > Ausgabe 11/2020
Autoren:
Hidetaka Okubo, Junichi Akiyama, Masao Kobayakawa, Megumi Kawazoe, Saori Mishima, Yusuke Takasaki, Naoyoshi Nagata, Takayuki Shimada, Chizu Yokoi, Shiori Komori, Kana Kimura, Yuya Hisada, Eri Iwata, Kazuhiro Watanabe, Naohiro Yanagisawa, Sho Shiroma, Akira Shimomura, Koki Okahara, Hourin Cho, Naomi Uemura
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Abstract

Background

Helicobacter pylori causes peptic ulcers and accounts for over 90% of gastric cancers; however, eradication rates have been declining due to antimicrobial resistance. Vonoprazan (VPZ), a potassium-competitive acid blocker, produces rapid and profound gastric acid suppression and has shown promising effects in the improvement of H. pylori eradication rates. The efficacy and safety of VPZ-based triple therapy as a first-line regimen for H. pylori eradication and its relationship with clarithromycin (CAM) susceptibility were evaluated.

Methods

From May 2015 to September 2017, H. pylori-infected patients who underwent esophagogastroduodenoscopy with CAM susceptibility testing were prospectively enrolled. Patients received a 7-day triple therapy regimen (VAC) of VPZ (20 mg), amoxicillin (750 mg), and CAM (200 mg) twice daily. Eradication rates, demographics, CAM susceptibility, and safety profiles were assessed.

Results

VAC was administered to 146 patients (median age: 63, range: 22–85 years) (60% of whom were females) who underwent CAM susceptibility testing, and 131 patients underwent 13C-urea breath testing to evaluate eradication success. The prevalence of CAM resistance was 34.2%. The overall eradication rates of VAC in per protocol (PP) and “intention to treat” (ITT) analyses were 90.8% (n = 131) and 81.5% (n = 146), respectively. In PP analysis for CAM susceptibility, the eradication rates of VAC were comparable between CAM-sensitive (91.6%, n = 83) and CAM-resistant (89.4%, n = 47) strains. The corresponding rates from the ITT analysis were 80.0% (n = 95) and 84.0% (n = 50), respectively. No adverse events requiring discontinuation of VAC were observed.

Conclusions

CAM-resistant H. pylori was prevalent in one-third of patients in the Tokyo metropolitan area. VPZ-based triple therapy was highly effective and well-tolerated irrespective of CAM susceptibility. Therefore, it could be a valuable first-line treatment regimen for H. pylori infection.

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