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A Pilot Study to Determine Radioiodide Accumulation and Dosimetry in Breast Cancers Using 124I PET/CT

This is a pilot imaging study for women whose tumors express NIS [Na+I- symporter, sodium iodide symporter]. Eligibility is limited to the presence of strong (3+) and/or plasma membrane staining in > 20% of cells as determined by immunohistochemical methods. A total of 10 patients will be imaged with 124I PET/CT (serial scans over 24 hour period) to determine radioiodide uptake and distribution in tumor tissue. Thyroid iodide uptake and retention will be blocked beginning one week prior to 124I PET/CT scan with thyroid hormone (T3) and methimazole (impedes organification). Tumor, organ and whole body dosimetry will be calculated in each patient.

Stanford is not currently accepting new patients for this trial. You may want to check to see if other locations are recruiting.



  • procedure : 124I PET/CT

Phase: N/A


Ages Eligible For Study:

18 Years - N/A

Inclusion Criteria

1. Stage I-IV breast cancer. Patients must have clinical or radiographic evidence of localized or metastatic disease. 2. Criteria for NIS-positivity are defined as: >= 20% of cells with plasma membrane and/or strong intracellular/plasma membrane immunoreactivity 3. Any previous therapy including radiation therapy is allowable. 4. Women 18 years of age or older. 5. Patients must have a life expectancy of at least 3 months 6. Patients with ECOG Performance Status 0-3 will be eligible. 7. If on chemotherapy, thyroid suppression should be initiated no sooner than two weeks after last chemotherapy cycle. 8. Ability to understand and willingness to sign a written informed consent document. 9. Discontinuation of hormonal or biological therapies for the 10 days of the study is preferred but not mandated. 10. Laboratory tests (CBC, comprehensive metabolic panel) must be performed within 120 day prior to study initiation.

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Contact information

Stanford University
School of Medicine
300 Pasteur Drive
Stanford, CA 94305

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