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Lifetime increased cancer risk in mice following exposure to clinical proton beam-generated neutrons.

ABSTRACT: To evaluate the life span and risk of cancer following whole-body exposure of mice to neutrons generated by a passively scattered clinical spread-out Bragg peak (SOBP) proton beam.Three hundred young adult female FVB/N mice, 152 test and 148 control, were entered into the experiment. Mice were placed in an annular cassette around a cylindrical phantom, which was positioned lateral to the mid-SOBP of a 165-MeV, clinical proton beam. The average distance from the edge of the mid-SOBP to the conscious active mice was 21.5 cm. The phantom was irradiated with once-daily fractions of 25 Gy, 4 days per week, for 6 weeks. The age at death and cause of death (ie, cancer and type vs noncancer causes) were assessed over the life span of the mice.Exposure of mice to a dose of 600 Gy of proton beam-generated neutrons, reduced the median life span of the mice by 4.2% (Kaplan-Meier cumulative survival, P=.053). The relative risk of death from cancer in neutron exposed versus control mice was 1.40 for cancer of all types (P=.0006) and 1.22 for solid cancers (P=.09). For a typical 60 Gy dose of clinical protons, the observed 22% increased risk of solid cancer would be expected to decrease by a factor of 10.Exposure of mice to neutrons generated by a proton dose that exceeds a typical course of radiation therapy by a factor of 10, resulted in a statistically significant increase in the background incidence of leukemia and a marginally significant increase in solid cancer. The results indicate that the risk of out-of-field second solid cancers from SOBP proton-generated neutrons and typical treatment schedules, is 6 to 10 times less than is suggested by current neutron risk estimates.

SUBMITTER: Gerweck LE

PROVIDER: S-EPMC4298825 | biostudies-literature | 2014 May

REPOSITORIES: biostudies-literature

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Lifetime increased cancer risk in mice following exposure to clinical proton beam-generated neutrons.

Gerweck Leo E LE Huang Peigen P Lu Hsiao-Ming HM Paganetti Harald H Zhou Yenong Y

International journal of radiation oncology, biology, physics 20140501 1

<h4>Purpose</h4>To evaluate the life span and risk of cancer following whole-body exposure of mice to neutrons generated by a passively scattered clinical spread-out Bragg peak (SOBP) proton beam.<h4>Methods and materials</h4>Three hundred young adult female FVB/N mice, 152 test and 148 control, were entered into the experiment. Mice were placed in an annular cassette around a cylindrical phantom, which was positioned lateral to the mid-SOBP of a 165-MeV, clinical proton beam. The average distan ...[more]

PMID: 24725699

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Lifetime increased cancer risk in mice following exposure to clinical proton beam-generated neutrons.

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Lifetime increased cancer risk in mice following exposure to clinical proton beam-generated neutrons.

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