Tumor aggressiveness is independent of radiation quality in murine hepatocellular carcinoma and mammary tumor models

Estimating cancer risk associated with interplanetary space travel is complicated. Human exposure data to high atomic number, high-energy (HZE) radiation is lacking, so data from low linear energy transfer (low-LET) γ-ray radiation is used in risk models, with the assumption that HZE and γ-ray radia...

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Published in:	International journal of radiation biology Vol. 97; no. 8; pp. 1140 - 1151
Main Authors:	Udho, Eshwar B., Huebner, Shane M., Albrecht, Dawn M., Matkowskyj, Kristina A., Clipson, Linda, Hedican, Catigan A., Koth, Rachel, Snow, Santina M., Eberhardt, Emily L., Miller, Devon, Van Doorn, Rachel, Gjyzeli, Genti, Spengler, Erin K., Storts, Douglas R., Thamm, Douglas H., Edmondson, Elijah F., Weil, Michael M., Halberg, Richard B., Bacher, Jeffery W.
Format:	Journal Article
Language:	English
Published:	England Taylor & Francis 03-08-2021
Subjects:	Animals biomarker discovery Carcinoma, Hepatocellular - pathology Carcinoma, Hepatocellular - radiotherapy Disease Models, Animal Female Gamma Rays - adverse effects Linear Energy Transfer liver cancer Liver Neoplasms - pathology Liver Neoplasms - radiotherapy Mammary cancer Mammary Neoplasms, Experimental - pathology Mammary Neoplasms, Experimental - radiotherapy metastasis Mice mouse model Neoplasms, Radiation-Induced - etiology Neoplasms, Radiation-Induced - pathology radiation Silicon liver cancer mouse model metastasis radiation biomarker discovery Mammary cancer
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Summary:	Estimating cancer risk associated with interplanetary space travel is complicated. Human exposure data to high atomic number, high-energy (HZE) radiation is lacking, so data from low linear energy transfer (low-LET) γ-ray radiation is used in risk models, with the assumption that HZE and γ-ray radiation have comparable biological effects. This assumption has been challenged by reports indicating that HZE radiation might produce more aggressive tumors. The goal of this research is to test whether high-LET HZE radiation induced tumors are more aggressive. Murine models of mammary and liver cancer were used to compare the impact of exposure to 0.2Gy of 300MeV/n silicon ions, 3 Gy of γ-rays or no radiation. Numerous measures of tumor aggressiveness were assessed. For the mammary cancer models, there was no significant change in the tumor latency or metastasis in silicon-irradiated mice compared to controls. For the liver cancer models, we observed an increase in tumor incidence but not tumor aggressiveness in irradiated mice. Tumors in the HZE-irradiated mice were not more aggressive than those arising from exposure to low-LET γ-rays or spontaneously. Thus, enhanced aggressiveness does not appear to be a uniform characteristic of all tumors in HZE-irradiated animals.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0955-3002 1362-3095 1362-3095
DOI:	10.1080/09553002.2021.1900946