Abstract
Purpose
The purpose of the present study is to evaluate safety, human radiation dosimetry, and optimal imaging time of [89Zr]trastuzumab in patients with HER2-positive breast cancer.
Procedures
Twelve women with HER2-positive breast cancer underwent [89Zr]trastuzumab positron emission tomography (PET)/X-ray computed tomography (CT) twice within 7 days post-injection. Biodistribution data from whole-torso PET/CT images and organ time-activity curves were created using data from all patients. Human dosimetry was calculated using OLINDA with the adult female model.
Results
High-quality images and the greatest tumor-to-nontumor contrast were achieved with images performed 5 ± 1 day post-injection. Increased [89Zr]trastuzumab uptake was seen in at least one known lesion in ten patients. The liver was the dose-limiting organ (retention of ∼12 % of the injected dose and average dose of 1.54 mSv/MBq). The effective dose was 0.47 mSv/MBq. No adverse effects of [89Zr]trastuzumab were encountered.
Conclusion
[89Zr]trastuzumab was safe and optimally imaged at least 4 days post-injection. The liver was the dose-limiting organ.
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Acknowledgments
This work was supported by the National Cancer Institute Grant CA182945, US Department of Energy Grants DESC0008432 and DESC0012737, and the Alvin J. Siteman Cancer Center Imaging and Response Assessment Core. We thank the Washington University Isotope Production team for production of Zr-89 and the Small Animal Imaging facility for animal biodistribution studies.
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RB is a consultant for Genentech and has received an honorarium from Genentech and Novartis.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Laforest, R., Lapi, S.E., Oyama, R. et al. [89Zr]Trastuzumab: Evaluation of Radiation Dosimetry, Safety, and Optimal Imaging Parameters in Women with HER2-Positive Breast Cancer. Mol Imaging Biol 18, 952–959 (2016). https://doi.org/10.1007/s11307-016-0951-z
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DOI: https://doi.org/10.1007/s11307-016-0951-z