Rhein-based necrosis-avid MRI contrast agents for early evaluation of tumor response to microwave ablation therapy.

Abstract

PURPOSE:

Early evaluation of tumor response to thermal ablation therapy can help identify untreated tumor cells and then perform repeated treatment as soon as possible. The purpose of this work was to explore the potential of rhein-based necrosis-avid contrast agents (NACAs) for early evaluation of tumor response to microwave ablation (MWA).

METHODS:

3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide (MTT) assay was performed to test the cytotoxicity of rhein-based NACAs against HepG2 cells. Rat models of liver MWA were used for investigating the effectiveness of rhein-based NACAs in imaging the MWA lesion, the optimal time period for post-MWA MRI examination, and the metabolic behaviors of 68 Ga-labeled rhein-based NACAs. Rat models of orthotopic liver W256 tumor MWA were used for investigating the time window of rhein-based NACAs for imaging the MWA lesion, the effectiveness of these NACAs in distinguishing the residual tumor and the MWA lesion, and their feasibility in early evaluating the tumor response to MWA.

RESULTS:

Gadolinium 2,2',2''-(10-(2-((4-(4,5-Dihydroxy-9,10-dioxo-9,10-dihydroanthracene-2-carboxamido)butyl)amino)-2-oxoethyl)-1,4,7,10-tetraazacyclododecane-1,4,7-triyl)triacetic acid (GdL2 ) showed low cytotoxicity and high quality in imaging the MWA region. The optimal time period for post-MWA MRI examination using GdL2 was 2 to 24 h after the treatment. During 2.5 to 3.5 h postinjection, GdL2 can better visualize the MWA lesion in comparison with gadolinium 2-[4,7,10-tris(carboxymethyl)-1,4,7,10-tetraazacyclododec-1-yl]acetic acid (Gd-DOTA), and the residual tumor would not be enhanced. The tumor response to MWA as evaluated by using GdL2 -enhanced MRI was consistent with histological examination.

CONCLUSION:

GdL2 appears to be a promising NACA for the tumor response assessment after thermal ablation therapies.

• Authors: Tianze Wu, Jian Zhang, Qiaomei Jin, Meng Gao, Dongjian Zhang, Libang Zhang, Yuanbo Feng, Yicheng Ni, Zhiqi Yin
• Journal: Magnetic resonance in medicine (Magn Reson Med) Vol. 82 Issue 6 Pg. 2212-2224 (12 2019) ISSN: 1522-2594 [Electronic] United States
• PMID: 31418484 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2019 International Society for Magnetic Resonance in Medicine.

Chemical References

• Anthraquinones
• Contrast Media
• Heterocyclic Compounds
• Organometallic Compounds
• Solvents
• gadolinium 1,4,7,10-tetraazacyclododecane-N,N',N'',N'''-tetraacetate
• Gadolinium
• rhein

Topics

• Animals
• Anthraquinones (chemistry)
• Catheter Ablation
• Contrast Media (chemistry)
• Gadolinium (chemistry)
• Hep G2 Cells
• Heterocyclic Compounds
• Humans
• Hyperthermia, Induced
• Liver (surgery)
• Liver Neoplasms (diagnostic imaging, therapy)
• Magnetic Resonance Imaging
• Microwaves
• Necrosis
• Organometallic Compounds
• Rats
• Rats, Sprague-Dawley
• Solvents
• Treatment Outcome