High Dose Amoxicillin Versus Tetracycline as Second-line Treatment of Resistant Helicobacter Pylori Infection

Overview

No trial has examined the the efficacy of high dose amoxicillin based quadruple therapy as second-line treatment for Helicobacter pylori infection. The study aims to compare the effectiveness and safety of 14-day high dose amoxicillin-based quadruple regiment with classical quadruple regiment for rescue eradication of Helicobacter pylori.

Full Title of Study: “Prospective, Randomized Controlled Trial Comparing High Dose Amoxicillin Versus Tetracycline Based Quadruple Therapy as Second-line Treatment for Resistant Helicobacter Pylori Infection”

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: Randomized
    • Intervention Model: Parallel Assignment
    • Primary Purpose: Treatment
    • Masking: None (Open Label)
  • Study Primary Completion Date: October 2015

Detailed Description

Helicobacter pylori is the most successful human pathogen infecting an estimated 50% of the global population, and is associated with a spectrum of disease states, including chronic gastritis, duodenal and gastric ulcer, gastric adenocarcinoma, and gastric mucosa-associated lymphoid tissue lymphoma (MALToma). Most Consensus Conferences and Clinical Guidelines recommend the prescription of a triple therapy including a proton pump inhibitor (PPI) and clarithromycin with either amoxicillin or metronidazole, as first-line treatment. However, the effectiveness of these triple-therapy regimens seems to have diminished over time, largely as a result of emerging resistance of the organism to clarithromycin. Avoiding problems due to antibiotic resistance has become an important issue when deciding a second-line rescue therapy for H. pylori infection Bismuth-containing quadruple therapies have been used widely in second-line therapy of H. pylori infection, and are recommended by the Maastricht IV Consensus Conference report. Quadruple therapy can achieve a high rate of eradication success as a second-line treatment. A meta-analysis of quadruple therapy showed that metronidazole resistance had limited effect on the outcome when adequate dosages and durations are used. This meta-analysis also showed that compliance with quadruple therapy is high. Classical bismuth-based quadruple therapy consists of a PPI, bismuth, tetracycline and metronidazole. This regiment meets the proposed criteria for a second-line treatment: it does not contain the key antibiotic of the original regimen (clarithromycin), the treatment is not affected by clarithromycin resistance, metronidazole resistance in vitro does not affect the outcome of quadruple therapy significantly, compliance with the regimen is high and the regimen is effective in most parts of the world. But this regiment has high rate of side effects because of tetracycline. Amoxicillin has low resistance rate as well as low percentage of side effects. The replacement of tetracycline by high dose amoxicillin in classical bismuth-containing quadruple therapy may be a better choice. Therefore, we will do a randomized trial to compare the eradication rate of 14-day high dose amoxicillin and metronidazole based bismuth-containing quadruple therapy with classical quadruple therapy for second-line Helicobacter pylori treatment.

Interventions

  • Drug: Lansoprazole
    • antisecretory drug of each quadruple therapy
  • Drug: Bismuth Potassium Citrate
    • one component of each quadruple therapy
  • Drug: Metronidazole
    • antibiotic of each quadruple therapy
  • Drug: Amoxicillin
    • antibiotic of high dose amoxicillin based quadruple therapy
  • Drug: Tetracycline
    • antibiotic of classical quadruple therapy

Arms, Groups and Cohorts

  • Experimental: High Dose Amoxicillin
    • High dose amoxicillin/metronidazole-based quadruple therapy for 14 days: Lansoprazole 30mg bid, Bismuth Potassium Citrate 220mg bid, Amoxicillin 1000mg tid, Metronidazole 400mg qid
  • Active Comparator: Tetracycline
    • Classical quadruple therapy for 14 days: Lansoprazole 30mg bid, Bismuth Potassium Citrate 220mg bid, Tetracycline 500mg qid, Metronidazole 400mg qid

Clinical Trial Outcome Measures

Primary Measures

  • Eradication rate of Helicobacter pylori
    • Time Frame: 2 months
    • Access eradication rate of H. pylori by intention to treat (ITT) and per-protocol (PP) analysis in each treatment group

Secondary Measures

  • Frequency of side effects of each treatment
    • Time Frame: 2 months
    • Score side effects as mild, moderate or severe according to their influence on daily activities

Participating in This Clinical Trial

Inclusion Criteria

  • all patients had failed H.pylori therapies including clarithromycin, metronidazole and/or amoxicillin (if not allergic) before – indication of rescue H pylori eradication treatment – Ability and willingness to participate in the study and to sign and give informed consent Exclusion Criteria:

  • patients less than 18 years old – previous gastric surgery – pregnancy or lactation – major systemic diseases, – administration of antibiotics, bismuth, antisecretory drugs in the preceding 8 weeks – allergy to any one of the medication used in the quadruple regimens.

Gender Eligibility: All

Minimum Age: 18 Years

Maximum Age: 75 Years

Are Healthy Volunteers Accepted: No

Investigator Details

  • Lead Sponsor
    • Shanghai Jiao Tong University School of Medicine
  • Provider of Information About this Clinical Study
    • Principal Investigator: Hong Lu, MD, Professor of GI Division – Shanghai Jiao Tong University School of Medicine
  • Overall Official(s)
    • Hong Lu, M.D., Principal Investigator, RenJi Hospital

References

Malfertheiner P, Megraud F, O'Morain CA, Atherton J, Axon AT, Bazzoli F, Gensini GF, Gisbert JP, Graham DY, Rokkas T, El-Omar EM, Kuipers EJ; European Helicobacter Study Group. Management of Helicobacter pylori infection–the Maastricht IV/ Florence Consensus Report. Gut. 2012 May;61(5):646-64. doi: 10.1136/gutjnl-2012-302084.

Lu H, Zhang W, Graham DY. Bismuth-containing quadruple therapy for Helicobacter pylori: lessons from China. Eur J Gastroenterol Hepatol. 2013 Oct;25(10):1134-40. doi: 10.1097/MEG.0b013e3283633b57.

Clinical trials entries are delivered from the US National Institutes of Health and are not reviewed separately by this site. Please see the identifier information above for retrieving further details from the government database.

At TrialBulletin.com, we keep tabs on over 200,000 clinical trials in the US and abroad, using medical data supplied directly by the US National Institutes of Health. Please see the About and Contact page for details.