Radiotheranostic Agent 64Cu-cyclam-RAFT-c(-RGDfK-)4 for Management of Peritoneal Metastasis in Ovarian Cancer
Purpose: Ovarian cancer peritoneal metastases (OCPMs) are a pathophysiologically heterogeneous group of tumors that are rarely curable. αVβ3 Integrin (αVβ3) is overexpressed on tumoral neovessels and frequently on ovarian cancer cells. Here, using two clinically relevant αVβ3-positiveOCPM mouse models, we studied the theranostic potential of an αVβ3-specific radiopeptide, 64Cu-cyclam-RAFT-c(-RGDfK-)4 (64Cu-RaftRGD), and its intra- and intertumoral distribution in relation to the tumor microenvironment. Experimental Design:αVβ3-Expressing peritoneal and subcutaneous models of ovarian carcinoma (IGR-OV1 and NIH:OVCAR-3) were established in nude mice. 64Cu-RaftRGD was administered either intravenously or intraperitoneally. We performed intratumoral distribution (ITD) studies, PET/CT imaging and quantification, biodistribution assay and radiation dosimetry, and therapeutic efficacy and toxicity studies. Results: Intraperitoneal administration was an efficient route for targeting 64Cu-RaftRGD to OCPMs with excellent tumor penetration. Using the fluorescent surrogate Cy5.5-RaftRGD in our unique high-resolution multifluorescence analysis, we found that the ITD of 64Cu-RaftRGD was spatially distinct from but complementary to that of hypoxia. 64Cu-RaftRGD-based PET enabled clear visualization of multiple OCPM deposits and ascites; biodistribution analysis demonstrated an inverse correlation between tumor uptake and tumor size (1.2-17.2 mm). 64Cu-RaftRGD at a radiotherapeutic dose (148 MBq/0.357 nmol) showed antitumor activities by inhibiting tumor cell proliferation and inducing apoptosis, and negligible toxicity. Conclusions: Collectively, these results demonstrate the all-in-one potential of 64Cu-RaftRGD for imaging-guided radiotherapy of OCPM by targeting both tumoral neovessels and cancerous cells. Based on the ITD finding, we propose that pairing αVβ3- and hypoxia-targeted radiotherapies could improve therapeutic efficacy by overcoming the heterogeneity of ITD encountered with single-agent treatments.
Références
- Titre
- Radiotheranostic Agent 64Cu-cyclam-RAFT-c(-RGDfK-)4 for Management of Peritoneal Metastasis in Ovarian Cancer
- Type de publication
- Article de revue
- Année de publication
- 2020
- Auteurs
- Jin, Zhao-hui, Tsuji Atsushi B., Degardin Melissa, Sugyo Aya, Obara Satoshi, Wakizaka Hidekatsu, Nagatsu Kotaro, Hu Kuan, Zhang Ming-Rong, Dumy Pascal, Boturyn Didier, and Higashi Tatsuya
- Revue
- Clinical Cancer Research
- Volume
- 26
- Ticket
- 23
- Pagination
- 6230-6241
- Date de publication
- 09/2020
- ISSN
- 1078-0432
Soumis le 16 septembre 2020