Chemoprevention of Gastric Cancer by Intervention With Helicobacter Pylori and Cyclooxygenase Pathway

Gastric cancer is the second leading cause of cancer deaths in the World. In China, gastric cancer exceeds all other cancer mortality except lung cancer. Helicobacter pylori infection is an important cause of gastric cancer. We have previously started a randomized placebo-controlled chemoprevention trial in Changle in 1994 to address the issue of whether eradication of H. pylori alone is able to prevent or reduce the risk of gastric cancer. The project involved 1600 subjects and is still ongoing. On the other hand, our laboratory research indicated that an abnormally high expression of an enzyme cyclooxygenase-2 was found in gastric cancer and inhibition of this enzyme by a new drug (specific cyclooxygenase-2 inhibitor) could kill the cancer cells. The same drug is approved now for use in treatment of hereditary colon cancer syndrome (Familial Adenomatous Polyposis, FAP), in the same rationale of tumour suppressive property of this drug. We are now initiating a second chemoprevention study to assess the addition of this specific cyclooxygenase-2 inhibitor together with eradication of H. pylori on prevention or reduction of the risk of gastric cancer and to assess whether the combination can reverse pre-cancerous lesions in the stomach in the high-risk population. The proposed site is Shangdong, China with very high prevalence of pre-cancerous lesions in asymptomatic H. pylori carriers. We plan to recruit 1500 H. pylori positive subjects for this randomized placebo-controlled study. H. pylori carriers will be randomized to receive treatment for the infection or placebo, followed by specific COX-2 inhibitor or placebo for 3 years. The results will have significant impact on prevention of gastric cancer on a national scale and worldwide.

Study Overview

• Status: Unknown
• Conditions: Stomach Neoplasms
• Intervention / Treatment: Drug: Triple therapy for H. pylori infection; Drug: Cox-2 inhibitor

• Study Type: Interventional
• Enrollment (Anticipated): 1200
• Phase: Not Applicable

Contacts and Locations

Study Locations

• China
  • China, China
    • China

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 45 years and older (ADULT, OLDER_ADULT)
• Accepts Healthy Volunteers: N/A
• Genders Eligible for Study: All

Description

Inclusion Criteria:

1. Subject demonstrates a willingness to participate in the study as indicated by written informed consent.
2. Male or female subject is at least 45 years of age.
3. Subject indicates a willingness to abstain from the use of all NSAIDs (including over-the-counter products) and aspirin for the duration of the study.
4. Female subject of childbearing potential has been using an effective means of contraception for 1 week prior to the preliminary visit. She also has agreed to remain abstinent, or to use oral birth control pills or single-barrier contraception (partner using condom or subject using diaphragm, contraceptive sponge or IUD) beginning at the preliminary visit and continuing till the end of the study. Women who are postmenopausal or status post-hysterectomy or tubal ligation are exempt from this requirement. (Postmenopausal is defined as no menses for the previous 1 year. If cessation of menses is within 18 months, FSH must be documented as elevated into the postmenopausal range before entry).
5. Subject is judged to be in stable health based on medical history, physical examination, and routine laboratory tests.

Exclusion Criteria:

According to medical history

1. Subject has a bleeding diathesis or requires anticoagulant therapy.
2. Subject has uncontrolled hypertension. (Note: Subjects with medically controlled hypertension [diastolic blood pressure <95 mm Hg, systolic blood pressure <165 mm Hg] may participate.)
3. Subject has a history of stroke or transient ischemic attack within the past 2 years.
4. Subject has a history of hepatitis/hepatic disease that has been active within the previous 2 years.
5. Subject has angina or congestive heart failure, with symptoms that occur at rest or minimal activity, or has a history of myocardial infarction within the past 1 year.
6. Subject has a history of neoplastic disease within the previous 10 years. Exceptions: subjects with malignancy successfully treated >10 years prior to screening, where, in the judgment of the investigator and treating physician, there has been no evidence of recurrence from the time of treatment through the time of screening.
7. Subject has a history of esophageal or gastric surgery.
8. Subject has undergone previous small or large bowel resection.
9. Subject has a history of inflammatory bowel disease (ulcerative colitis or Crohn's disease).
10. Subject is allergic to paracetamol or subject has hypersensitivity (e.g., all or part of the syndrome of nasal polyps, angioedema, and bronchospastic reactivity) to aspirin, paracetamol, or other NSAIDs. NOTE: Subjects with a history of idiosyncratic allergic reaction (e.g., rash) to a single NSAID in the past but who tolerated at least 2 other NSAID medications without hypersensitivity reactions may participate.
11. Subject is expected to need chronic NSAID treatment during the trial and/or subject has been taking NSAIDs (including salicylates or other aspirin-containing compounds) on a chronic basis.
12. Subject has had ongoing or is expected to require treatment with any of the following: Ticlopidine, clopidrogel, or regular doses of aspirin, including "low-dose" aspirin, e.g., to prevent complications of vascular disease. Subjects may not discontinue an established course of anti-platelet therapy in order to enter this study.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: PREVENTION
• Allocation: RANDOMIZED
• Interventional Model: PARALLEL
• Masking: DOUBLE

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Regression or prevent progression of various precancerous gastric conditions including gastric atrophy, intestinal metaplasia and dysplasia	3 years
Changes in cell proliferation, apoptosis and oncogene expressions	3 years

Secondary Outcome Measures

Outcome Measure	Time Frame
The incidence of gastric cancer in a high risk area	5-10 years

Collaborators and Investigators

• Sponsor: Hospital Authority, Hong Kong
• Collaborators: The University of Hong Kong
• Investigators: Principal Investigator: Shiu Kum Lam, Prof, Department of Medicine, Queen Mary Hospital/ The University of Hong Kong

Publications and helpful links

Helpful Links

• HAREC Clinical Trial Registry

Study record dates

Study Major Dates

• Study Start: March 1, 2004
• Study Completion (ANTICIPATED): April 1, 2013

Study Registration Dates

• First Submitted: July 6, 2007
• First Submitted That Met QC Criteria: July 6, 2007
• First Posted (ESTIMATE): July 9, 2007

Study Record Updates

• Last Update Posted (ESTIMATE): July 7, 2010
• Last Update Submitted That Met QC Criteria: July 6, 2010
• Last Verified: July 1, 2010

More Information

Terms related to this study

• Keywords: Gastric cancer
• Additional Relevant MeSH Terms: Digestive System Diseases; Neoplasms; Neoplasms by Site; Gastrointestinal Neoplasms; Digestive System Neoplasms; Gastrointestinal Diseases; Stomach Diseases; Stomach Neoplasms; Physiological Effects of Drugs; Molecular Mechanisms of Pharmacological Action; Peripheral Nervous System Agents; Enzyme Inhibitors; Analgesics; Sensory System Agents; Anti-Inflammatory Agents, Non-Steroidal; Analgesics, Non-Narcotic; Anti-Inflammatory Agents; Antirheumatic Agents; Cyclooxygenase Inhibitors; Cyclooxygenase 2 Inhibitors
• Other Study ID Numbers: EC1721-01; HARECCTR0500053