Abstract
Purpose
This study utilizes FLT PET/CT imaging to characterize changes in tumor cell proliferation and vasculature during intermittent treatment with VEGR-TKI axitinib.
Methods
Patients with metastatic solid malignancies underwent 3-week treatment cycles with axitinib (7 and 5 mg BID for safety and pharmacodynamic cohorts, respectively). Cycles consisted of 2 weeks of treatment (dosing period) followed by a 1-week treatment break (washout period). Patients in the pharmacodynamic cohort had up to six FLT PET/CT scans (three scans in each cycle 1 and cycle 3) and had plasma VEGF concentrations measured at imaging timepoints. Changes in tumor SUVs and VEGF within and across drug cycles were investigated.
Results
Eight patients enrolled in the safety cohort where it was determined 7 mg axitinib was not tolerable due to severe adverse events, including three patients who experienced significant hypertension and thrombovascular effects. Sixteen patients enrolled in the pharmacodynamic cohort demonstrated significant decreases in SUVs and increases in VEGF during dosing periods. This was followed by significant increases in SUVs and decreases in VEGF during drug washout periods. No significant differences in SUVs or VEGF were found when comparing cycle 1 with cycle 3. A mixed effects model demonstrated significant negative correlation between SUV and VEGF.
Conclusions
Response to axitinib included diminished FLT uptake during dosing periods followed by increased FLT uptake during drug washout periods. These changes were not different when comparing treatment cycle 1 versus cycle 3, suggesting that the pharmacodynamic effect of intermittent axitinib is similar across multiple drug cycles.
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Acknowledgements
The authors would like to thank the nurses and research specialists of the UWCCC Phase I Program for their efforts in managing this trial, the WIMR PET imaging personnel for acquiring images, and the patients for their participation in this study.
Funding
This clinical trial was funded by a Pfizer Investigator-Initiated Research Grant (PI: Liu) (WS1610530) as well as a Prostate Cancer Foundation Young Investigator Award (MSN133051). This trial was conducted within the Cancer Therapy Discovery and Development (CTD2) research program with support from the Translational Imaging Research Working Group (TIRWG) at the UW Carbone Cancer Center.
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The authors have no conflicts of interest to disclose.
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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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Informed consent was obtained from all individual participants included in the study.
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Matthew Scarpelli and Justine Yang Bruce are co-first authors and have contributed equally to the research and writing of the manuscript.
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Scarpelli, M., Bruce, J.Y., Carmichael, L. et al. 18F-FLT PET/CT imaging in patients with advanced solid malignancies treated with axitinib on an intermittent dosing regimen. Cancer Chemother Pharmacol 78, 1245–1252 (2016). https://doi.org/10.1007/s00280-016-3183-7
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DOI: https://doi.org/10.1007/s00280-016-3183-7