Molecular Imaging and Quantitation of EphA2 Expression in Xenograft Models with Zr-89-DS-8895a

作者：Burvenich Ingrid J G; Parakh Sagun; Gan Hui K; Lee Fook Thean; Guo Nancy; Rigopoulos Angela; Lee Sze Ting; Gong Sylvia; O'Keefe Graeme J; Tochon Danguy Henri; Kotsuma Masakatsu; Hasegawa Jun; Senaldi Giorgio; Scott Andrew M^*

来源：Journal of Nuclear Medicine, 2016, 57(6): 974-980.

DOI：10.2967/jnumed.115.169839

• bioimaging
• DS-8895a
• EphA2
• Zr-89
• cancer

Subtype A2 of the erythropoietin-producing hepatocellular tyrosine kinase (EphA2) cell surface receptor is expressed in a range of epithelial cancers. This study evaluated the molecular imaging of EphA2 expression in vivo in mouse tumor models using SPECT/MR and PET/MR and a humanized anti-EphA2 antibody, DS-8895a. Methods: DS-8895a was labeled with In-111, I-125, and Zr-89 and assessed for radiochemical purity, immunoreactivity (Lindmo analysis), antigen-binding affinity (Scatchard analysis), and serum stability in vitro. In vivo biodistribution, imaging, and pharmacokinetic studies were performed with SPECT/MR and PET/MR. A dose-escalation study was also performed to determine EphA2 receptor saturability through tissue and imaging quantitative analysis. Results: All conjugates demonstrated good serum stability and specific binding to EphA2-expressing cells in vitro. In vivo biodistribution studies showed high uptake of In-111-CHX-A"-DTPA-DS-8895a and Zr-89-Df-Bz-NCS-DS-8895a in EphA2-expressing xenograft models, with no specific uptake in normal tissues. In comparison, retention of I-125-DS-8895a in tumors was lower because of internalization of the radioconjugate and dehalogenation. These results were confirmed by SPECT/MR and PET/MR. EphA2 receptor saturation was observed at the 30 mg/kg dose. Conclusion: Molecular imaging of tumor uptake of DS-8895a allows noninvasive measurement of EphA2 expression in tumors in vivo and determination of receptor saturation. Zr-89-Df-Bz-NCS-DS-8895a is suited for human bioimaging trials on the basis of superior imaging characteristics and will inform DS-8895a dose assessment and patient response evaluation in clinical trials.

• 出版日期2016-6