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Diffusion-weighted MRI and 18F-FDG PET correlation with immunity in early radiotherapy response in BNL hepatocellular carcinoma mouse model: timeline validation.

Abstract：

PURPOSE:Imaging probes/biomarkers that are correlated with molecular or microenvironmental alterations in tumors have been used not only in diagnosing cancer but also in assessing the efficacy of cancer treatment. We evaluated the early response of hepatocellular carcinoma (HCC) to radiation treatment using T2-weighted magnetic resonance imaging (MRI), diffusion-weighted (DW) MRI, and 18F-fluorodeoxyglucose (18F-FDG) positron emission tomography (PET). METHODS:Orthotopic HCC tumors were established in the right liver lobe of Balb/c mice. Mice were longitudinally scanned using T2-weighted/DW MRI and 18F-FDG PET 1 day before and on days 1, 3, 6, 9 and 13 after irradiation with 15 Gy to the right liver lobe to determine tumor size, apparent diffusion coefficient (ADC) value, and maximum standardized uptake value. Immunohistochemical (IHC) staining was performed to validate the tumor microenvironment. RESULTS:Irradiation markedly retarded tumor growth in the orthotopic HCC model and led to increaes in ADC values as early as on day 1 after irradiation. Irradiation also resulted in increases in 18F-FDG uptake on day 1 that were sustained until the end of the observation period. IHC staining revealed a decrease in the number of proliferative cells and a continuous macrophage influx into irradiated tumors, which dramatically altered the tumor microenvironment. Lastly, in vitro coculture of HCC cells and macrophages led to interaction between the cells and enhanced the cellular uptake of 18F-FDG. CONCLUSION:ADC values and 18F-FDG uptake measured using DW MRI and 18F-FDG PET serve as potential biomarkers for early assessment of HCC tumor responses to radiation therapy.

journal_name

Eur J Nucl Med Mol Imaging

journal_title

European journal of nuclear medicine and molecular imaging

authors

Chung YH,Yu CF,Chiu SC,Chiu H,Hsu ST,Wu CR,Yang CL,Hong JH,Yen TC,Chen FH

doi

10.1007/s00259-019-04318-3

subject

Has Abstract

pub_date

2019-07-01 00:00:00

pages

1733-1744

issue

eissn

1619-7070

issn

1619-7089

pii

10.1007/s00259-019-04318-3

journal_volume

pub_type

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Diffusion-weighted MRI and 18F-FDG PET correlation with immunity in early radiotherapy response in BNL hepatocellular carcinoma mouse model: timeline validation.