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Double strand break induction and kinetics indicate preserved hypersensitivity in keratinocytes to subtherapeutic doses for 7 weeks of radiotherapy

Journal article
Authors F. Qvarnström
M. Simonsson
Jan Nyman
Ingegerd Hermansson
M. Book
Karl-Axel Johansson
I. Turesson
Published in Radiotherapy and Oncology
Volume 122
Issue 1
Pages 163-169
ISSN 0167-8140
Publication year 2017
Published at Institute of Clinical Sciences, Section for Oncology, Radiation Physics, Radiology and Urology, Department of Radiation Physics
Institute of Clinical Sciences, Section for Oncology, Radiation Physics, Radiology and Urology, Department of Oncology
Pages 163-169
Language en
Links dx.doi.org/10.1016/j.radonc.2016.12...
Keywords Double strand breaks, Hyper-radiosensitivity, Keratinocytes, Radiotherapy
Subject categories Cancer and Oncology, Radiology

Abstract

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 radiotherapeutic 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, γH2AX 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 γH2AX 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 γH2AX- and 53BP1-labelled DSB foci, throughout a 7-week treatment course with daily repeated subtherapeutic dose fractions. © 2016 Elsevier Ireland Ltd

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