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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Neoplastic transformation in vitro induced by low doses of 232 MeV protons.

The aim was to define the dose--response curve for high-energy proton-induced neoplastic transformation in vitro. The HeLa x skin fibroblast human hybrid cell assay was used to determine the frequency of neoplastic transformation following doses of 232 MeV protons (mean linear energy transfer, LET=0.44 keV microm(-1)) in the range 5-600 mGy. Proton irradiations were carried out at the Loma Linda University Proton Treatment Facility, CA, USA. The data indicate no evidence for induction of transformation below a dose of 100 mGy. At doses of 5 and 50 mGy, there is evidence for a possible suppression of transformation frequencies below that for spontaneous transformation. The shape of the dose--response curve for high-energy proton-induced transformation of the human hybrid cell line CGL1 does not follow a linear no-threshold model and shows evidence for a threshold as well as for possible suppression of transformation at doses <100 mGy, similar to that seen for other low-LET radiations.[1]


  1. Neoplastic transformation in vitro induced by low doses of 232 MeV protons. Elmore, E., Lao, X.Y., Ko, M., Rightnar, S., Nelson, G., Redpath, J. Int. J. Radiat. Biol. (2005) [Pubmed]
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