Chemoprevention of Gastric Cancer by Intervention With Helicobacter Pylori and Cyclooxygenase Pathway
Overview
- Phase
- Not Applicable
- Intervention
- Not specified
- Conditions
- Stomach Neoplasms
- Sponsor
- Hospital Authority, Hong Kong
- Enrollment
- 1200
- Locations
- 1
- Primary Endpoint
- Regression or prevent progression of various precancerous gastric conditions including gastric atrophy, intestinal metaplasia and dysplasia
- Last Updated
- 15 years ago
Overview
Brief Summary
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.
Investigators
Eligibility Criteria
Inclusion Criteria
- •Subject demonstrates a willingness to participate in the study as indicated by written informed consent.
- •Male or female subject is at least 45 years of age.
- •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.
- •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).
- •Subject is judged to be in stable health based on medical history, physical examination, and routine laboratory tests.
Exclusion Criteria
- •According to medical history
- •Subject has a bleeding diathesis or requires anticoagulant therapy.
- •Subject has uncontrolled hypertension. (Note: Subjects with medically controlled hypertension \[diastolic blood pressure \<95 mm Hg, systolic blood pressure \<165 mm Hg\] may participate.)
- •Subject has a history of stroke or transient ischemic attack within the past 2 years.
- •Subject has a history of hepatitis/hepatic disease that has been active within the previous 2 years.
- •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.
- •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.
- •Subject has a history of esophageal or gastric surgery.
- •Subject has undergone previous small or large bowel resection.
- •Subject has a history of inflammatory bowel disease (ulcerative colitis or Crohn's disease).
Outcomes
Primary Outcomes
Regression or prevent progression of various precancerous gastric conditions including gastric atrophy, intestinal metaplasia and dysplasia
Time Frame: 3 years
Changes in cell proliferation, apoptosis and oncogene expressions
Time Frame: 3 years
Secondary Outcomes
- The incidence of gastric cancer in a high risk area(5-10 years)