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Double strand break induction and kinetics indicate preserved hypersensitivity in keratinocytes to subtherapeutic doses for 7 weeks of radiotherapy
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Radiology, Oncology and Radiation Science, Oncology.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Radiology, Oncology and Radiation Science, Oncology.
Gothenburg Univ, Sahlgrenska Univ Hosp, Dept Oncol, Gothenburg, Sweden..
Gothenburg Univ, Sahlgrenska Univ Hosp, Dept Oncol, Gothenburg, Sweden..
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2017 (English)In: Radiotherapy and Oncology, ISSN 0167-8140, E-ISSN 1879-0887, Vol. 122, no 1, p. 163-169Article in journal (Refereed) Published
Abstract [en]

Background and purpose: Previously we reported that hyper-radiosensitivity (HRS) was evidenced by quantifying DNA double strand break (DSB) foci in epidermis biopsies collected after delivering radio therapeutic one and five dose fractions. The aim of this study was to determine whether HRS was preserved throughout a 7-week radiotherapy treatment, and also to examine the rate of foci decline and foci persistence between dose fractions.

Materials and methods: 42 patients with prostate cancer received 7-week fractionated radiotherapy treatment (RT) with daily dose fractions of 0.05-1.10 Gy to the skin. Before RT, and at several times throughout treatment, skin biopsies (n = 452) were collected at 30 min, and 2, 3, 24, and 72 h after dose fractions. DSB-foci markers, gamma H2AX and 53BP1, were labelled in epidermal keratinocytes with immunofluorescence and immunohistochemical staining. Foci were counted both with digital image analysis and manually.

Results: HRS in keratinocytes was evidenced by the dose-response relationships of DSB foci, observed throughout the treatment course, independent of sampling time and quantification method. Foci observed at 24 h after dose fractions indicated considerable DSB persistence. Accordingly, foci significantly accumulated after 5 consecutive dose fractions. For doses below 0.3 Gy, persistent foci could be observed even at 72 h after damage induction. A comparison of gamma H2AX and 53BP1 quantifications in double-stained biopsies showed similar HRS dose-response relationships.

Conclusions: These results represented the first evidence of preserved HRS, assessed by gamma H2AX- and 53BP1-labelled DSB foci, throughout a 7-week treatment course with daily repeated subtherapeutic dose fractions.

Place, publisher, year, edition, pages
ELSEVIER IRELAND LTD , 2017. Vol. 122, no 1, p. 163-169
Keywords [en]
Hyper-radiosensitivity, Double strand breaks, Keratinocytes, Radiotherapy
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:uu:diva-319872DOI: 10.1016/j.radonc.2016.12.004ISI: 000395217900027PubMedID: 28017476OAI: oai:DiVA.org:uu-319872DiVA, id: diva2:1091671
Funder
Swedish Cancer SocietyAvailable from: 2017-04-27 Created: 2017-04-27 Last updated: 2017-04-27Bibliographically approved

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