The Effect of Radioactive Iodine Administration for Thyroid Diseases on H.Pylori Eradication

Study Overview
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Brief Summary
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Because of the high iodine uptake in the stomach, radioactive iodine treatment for thyroid diseases (cancer or hyperthyroidism) or radioactive iodine administered for thyroid scan may be able to eradicate H.pylori infection from the stomach of patients infected with H.pylori. Also to test the hypothesis that CagA virulent strains of H.pylori are more common in patients with thyroid cancer than with other thyroid diseases.

Detailed Description
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Objective To test eradicate H.pylori after administration of radioactive iodine (131I) to patients with thyroid diseases and to evaluate their H.pylori CagA status . Design Observational study Setting The Isotopic Institute at the Rabin Medical Center, Campus Beilinson Patients Consecutive patients with thyroid diseases referred to the Isotopic Institute at the Rabin Medical Center, Campus Beilinson for either radioactive iodine (131I) thyroid scan or radioactive iodine (131I)treatment for their disease, will be screened, prior to the radioactive iodine, for H. pylori infection and CagA protein by serology. Patient with positive serology for H. pylori will be tested for active gastric infection using the H.pylori stool antigen test. The study population will include all patients who tested positive for H.pylori both by serology and stool antigen tests. Six to eight weeks and 6 month after administration of radioactive iodine (131I) treatment , stool antigen or H.pylori will be tested again to confirm persistence of H.pylori eradication. Main Outcome Measure confirmed H.pylori eradication by the stool antigen test. The rate of infection with virulent and caricogenic CagA H.pylori ,will be tested using the immunoblot assay. Summary We will test in this study whether Helicobacter pylori is eradicated, after radioactive iodine (131I) administration, from the stomach of patients with thyroid diseases. The rate of CagA virulent and carcinogenic H.pylori infection in theses patients will be assessed.

Official Title
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Effect of Radioactive Iodine on Eradication of Helicobacter Pylori in Patients Treated for Thyroid Diseases

Conditions
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Helicobacter Pylori Infected Patients, Thyroid Cancer Patients, Hyperthyroidism

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Adult patients between the ages of 18 and 80. Patients with diagnosed thyroid disease referred for thyroid scan or treatment with radioactive iodine (131I). Patients who provide informed consent Exclusion Criteria: Patients without diagnosed thyroid disease. Patients who are pregnant or breast feeding. Patients who have received previous treatment for H. pylori infection. Patients taking proton pump inhibitors. Patients with recent or current use of antibiotics. Patients allergic to iodine (131I).

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 85 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| To determine whether CagA helicobacter pylori infection is more prevalent in patients with thyroid diseases compared to other thyroid diseases |  | 2 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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radioactive iodine, Helicobacter pylori, Thyroid diseases, CagA