Abstract
Purpose
We assessed whether imaging αvβ3 integrin could distinguish mature teratoma from necrosis in human non-seminomatous germ cell tumour (NSGCT) post-chemotherapy residual masses.
Methods
Human embryonal carcinoma xenografts (six/rat) were untreated (controls) or treated to form mature teratomas with low-dose cisplatin and all-trans retinoic acid (ATRA) over a period of 8 weeks. In another group, necrosis was induced in xenografts with high-dose cisplatin plus etoposide (two cycles).18F-Fluorodeoxyglucose (18F-FDG) small animal positron emission tomography (SA PET) imaging was performed in three rats (one control and two treated for 4 and 8 weeks with cisplatin+ATRA). Imaging of αvβ3 expression was performed in six rats bearing mature teratomas and two rats with necrotic lesions on a microSPECT/CT device after injection of the tracer [99mTc]HYNIC-RGD [6-hydrazinonicotinic acid conjugated to cyclo(Arg-Gly-Asp-D-Phe-Lys)]. Correlative immunohistochemistry studies of human and mouse αvβ3 expression were performed.
Results
Cisplatin+ATRA induced differentiation of the xenografts. After 8 weeks, some glandular structures and mesenchymal cells were visible; in contrast, control tumours showed undifferentiated tissues. SA PET imaging showed that mature teratoma had very low avidity for 18F-FDG [mean standardised uptake value (SUVmean) = 0.48 ± 0.05] compared to untreated embryonal carcinoma (SUVmean = 0.92 ± 0.13) (p = 0.005). αvβ3 imaging accurately distinguished mature teratoma (tumour to muscle ratio = 4.29 ± 1.57) from necrosis (tumour to muscle ratio = 1.3 ± 0.26) (p = 0.0002). Immunohistochemistry studies showed that αvβ3 integrin expression was strong in the glandular structures of mature teratoma lesions and negative in host stroma.
Conclusion
Imaging αvβ3 integrin accurately distinguished mature teratoma from necrosis following cisplatin-based treatment in human NSGCT xenografts.
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Acknowledgments
This work was supported by a grant from the French Ligue contre le cancer, comités du Calvados et de l’Orne. The Inveon small animal PET scanner was purchased with grants from the Association pour le recherche sur la cancer (ARC), the Région Basse Normandie and funds from the François Baclesse Comprehensive cancer centre. The αvβ3 microSPECT/CT studies were supported by a grant from GEFLUC - Rouen.
The authors wish to thank Prof. Joseph Wu from Stanford University, CA and Dr. Shawn Chen from the Laboratory for Molecular Imaging and Nanomedicine, Bethesda, MD for helpful advice regarding the blocking experiments in αvβ3 imaging.
Maïa and Théo Aide are thanked for their help during manuscript editing.
Dr. Aide is indebted to Prof. Rodney J Hicks from the Centre for Molecular Imaging, East Melbourne, Australia, for his fruitful comments at the initiation of this work and for his critical review of the manuscript.
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Aide, N., Briand, M., Bohn, P. et al. αvβ3 imaging can accurately distinguish between mature teratoma and necrosis in 18F-FDG-negative residual masses after treatment of non-seminomatous testicular cancer: a preclinical study. Eur J Nucl Med Mol Imaging 38, 323–333 (2011). https://doi.org/10.1007/s00259-010-1624-9
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DOI: https://doi.org/10.1007/s00259-010-1624-9