Abstract
Purpose
The purpose of this study was to characterize imaging biomarkers for the potential benefit of hypoxia-inducible factor-1 (HIF-1)α inhibition (by PX-12) during 5-fluorouracil (5-FU) chemotherapy in the treatment of colorectal cancer (CRC).
Procedures
Therapy response to 5-FU ± PX-12 was assessed with baseline [18F]fluoromisonidazole ([18F]FMISO) and longitudinal 2-deoxy-2-[18F]fluoro-d-glucose ([18F]FDG) positron emission computed tomography (μPET/CT) in CRC xenograft model (n = 36) during breathing of a hypoxic (10 % O2) or normoxic (21 % O2) atmosphere. Ex vivo, immunohistochemistry was performed.
Results
Baseline [18F]FMISO uptake and relative tumor volume (RTV) 2 days after 5-FU or 5-FU + PX-12 administration correlated significantly (p ≤ 0.01). Under hypoxic breathing conditions, [18F]FDG uptake (−53.1 ± 8.4 %) and Ki67 expression (−16 %) decreased and RTV stagnated in the 5-FU + PX-12 treatment group, but not in 5-FU alone-treated tumors. Under normoxic breathing, [18F]FDG uptake (−23.5 ± 15.2 % and −72.8 ± 7.1 %) and Ki67 expression (−5 % and −19 %) decreased and RTV stagnated in both the 5-FU and the combination treatment group, respectively.
Conclusion
Baseline [18F]FMISO μPET may predict the beneficial effect of HIF-1α inhibition during 5-FU chemotherapy in CRC.
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Acknowledgments
We gratefully acknowledge Philippe Joye and Caroline Berghmans of the Molecular Imaging Center Antwerp (MICA) and Christophe Hermans of the Center for Oncological Research (CORE) for their excellent technical assistance, and Thomas Verbrugghen of MICA for the [18F]FMISO productions. This work was funded by the University of Antwerp, Belgium through a PhD grant for Sven De Bruycker, an associate professor position for Patrick Pauwels and Steven Staelens, and a full professor position for Sigrid Stroobants; by Antwerp University Hospital, Belgium, through a postdoctoral position for Christel Vangestel (Innovative Medicines Initiative, Quic-Concept), a full-time position for Leonie wyffels, and a departmental position for Tim Van den Wyngaert, Patrick Pauwels, and Sigrid Stroobants; and by the Research Foundation Flanders, Belgium (FWO Vlaanderen) through a postdoctoral fellowship for An Wouters.
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De Bruycker, S., Vangestel, C., Van den Wyngaert, T. et al. Baseline [18F]FMISO μPET as a Predictive Biomarker for Response to HIF-1α Inhibition Combined with 5-FU Chemotherapy in a Human Colorectal Cancer Xenograft Model. Mol Imaging Biol 18, 606–616 (2016). https://doi.org/10.1007/s11307-015-0926-5
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DOI: https://doi.org/10.1007/s11307-015-0926-5