Pilot Study of a 14-day Modified Sequential Therapy for Helicobacter Pylori Infection

Efficacy and Safety of a 14-day Modified Sequential Therapy for Refractory Helicobacter Pylori Infection: a Pilot Study

The purpose of this study is to assess efficacy of a 14-day sequential therapy for the rescue treatment of refractory Helicobacter pylori infection, and whether it is safe while maintaining an ideal eradication rates.

Half of the world's population is infected with Helicobacter pylori. Strong evidence supports that H.pylori eradication is an effective approach to reduce the risk of developing gastric cancer. However, eradication rates of first-line therapy decreased over years due to the rapidly emerging antibiotic resistance of H. pylori worldwide. An ideal rescue therapeutic regimen to cure refractory H.pylori infection is currently warranted.

Traditional sequential therapy failed to achieve an ideal eradication rates (over>95%) as a third line treatment in the region with high antibiotic resistance. The investigator's study aims to evaluate the efficacy 14-day modified sequential therapy in the patients with two or more treatment failure, and whether the adverse effects of this new modified sequential therapy are tolerable.

Inclusion Criteria:

• Patients aged 18-70 with persistent H. pylori infection.
• Patients failed at least three different standard eradication therapies before. Previous standard eradication therapy was defined as a 10-day or 14-day quadruple regimen designed according to Maastricht V report.

Exclusion Criteria:

• Patients unable or unwilling to receive gastroscopy.
• Patients treated with H2-receptor antagonist, PPI, bismuth and antibiotics in the previous 4 weeks.
• Patients with gastorectomy, acute GI bleeding and advanced gastric cancer.
• History of allergy to any of the drugs used in the study.
• Severe concomitant cardiovascular, respiratory, or endocrine diseases, clinically significant renal or hepatic disease, hematologic disorders and any other clinically significant medical condition that could increase risk.
• Currently pregnant or lactating.
• Severe neurologic or psychiatric disorders.
• Alcohol abuse or drug addiction.
• Patients with compliance lower than 90% in any previous treatment are not included.
• Inability to provide informed consent and other situations that could interfere with the examination or therapeutic protocol.