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Time and dose dependency of bone-sarcomas in patients injected with radium-224
D Chmelevsky1, A M Kellerer, C E Land
1Gesellschaft für Strahlen- und Umweltforschung (GSF) München, Institut für Strahlenschutz, Neuherberg, Federal Republic of Germany.
Abstract:
The time course and dose dependency of the incidence of bone-sarcomas among 900 German patients treated with high doses of radium-224 is analysed in terms of a proportional hazards model with a log-normal dependency of time to tumor and a linear-quadratic dose relation. The deduced dose dependency agrees well with a previous analysis in terms of a non-parametric proportional hazards model, and confirms the temporal distribution which has been used in the Radioepidemiological Tables of NIH. However, the linear-quadratic dose-response model gives a risk estimate for low doses which is somewhat less than half that obtained under the assumption of linearity.