Helicobacter Eradication Aspirin Trial

BACKGROUND: Aspirin use is widespread and increasing in elderly patients. The main hazard is gastrointestinal bleeding, the incidence of which is rising, probably because of increased aspirin use. The proposed trial is based on evidence that peptic ulcer bleeding in aspirin users occurs predominantly in people infected with the ulcerogenic bacterium, Helicobacter pylori. Our hypothesis is that low doses of aspirin do not cause ulcers in the way that high doses do. Instead we think that H. pylori causes the ulcer and aspirin, by thinning the blood, makes it bleed. If the bacterium is eradicated the patient will not get an ulcer and therefore there is no increased bleeding risk with aspirin. Development of the trial protocol has been based on results of a preparatory Medical Research Council-funded 2525 patient pilot study which had a 47% patient response rate. This enabled us to design the currently proposed large simple outcomes study to investigate directly the hypothesis that a one week course of H. pylori eradication will halve the rate of hospitalisation due to ulcer bleeding over ~2.5 years in aspirin users.

TRIAL CONDUCT: A large number of patients (~170,000), using aspirin <326 mg daily will be invited to participate. Suitable respondents (~33,000) who are H. pylori positive (~6,600) will give consent (including access to Hospital Episode Statistics and Office of National Statistics mortality data) and be randomised to eradication treatment or placebo. There will be no follow-up trial visits for 90% of patients. Instead the MiQuest tool, developed to interrogate different GP electronic databases, will be used together with direct patient notification to identify all possible ulcer bleeding admissions. An expert panel will use validated methodology to adjudicate whether patients have suffered ulcer bleeding (primary endpoint). The trial will continue until 87 positively adjudicated events have occurred, to ensure it has the power to answer the question of whether H. pylori eradication reduces the risk of ulcer bleeding.

Inclusion criteria

• Males and females ≥ 60 years of age at the date of screening.
• Subjects who are taking aspirin ≤325mg daily and who have had 4 or more 28-day prescriptions in the last year.
• Subjects who are concurrently using other anti-platelet agents are allowed to enter the study.
• Subjects who are willing and able to undergo a breath test for H. pylori, including fasting for 6 hours, and whose result is unequivocally positive (results of breath test will be determined post-screening).
• Subjects who are willing to give permission for their paper and electronic medical records to be accessed and abstracted by trial investigators.
• Subjects who are willing to be contacted and interviewed by trial investigators, should the need arise for adverse event assessment, etc.
• Subjects must be able to communicate well with the investigator or designee, to understand and comply with the requirements of the study and to understand and sign the written informed consent.

Exclusion criteria

• Subjects who are currently prescribed anti-ulcer therapy such as H2-receptor antagonists and proton-pump inhibitors.
• Subjects who are currently prescribed oral non-steroidal anti-inflammatory drugs (NSAIDs).
• Subjects who have a known intolerance or allergy to H. pylori eradication treatment.
• Subjects who are taking drugs with a clinically significant interaction with H. pylori eradication treatment.
• Subjects who are terminally ill or suffer from a life-threatening co-morbidity.
• Subjects whose behaviour or lifestyle would render them less likely to comply with study medication (eg. alcoholism, substance abuse, debilitating psychiatric conditions or inability to provide informed consent).
• Subjects currently participating in another interventional clinical trial or who have taken part in a trial in the previous three months.