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Title: | Correlation between DNA damage responses of skin to a test dose of radiation and late adverse effects of earlier breast radiotherapy |
Authors: | Somaiah, N Chua, MLK Bourne, S Daley, F A'Hern, R Nuta, O Gothard, L Boyle, S Herskind, C Pearson, A Warrington, J Helyer, S Owen, R Rothkamm, K Yarnold, J |
Keywords: | Breast cancer;Radiotherapy;Late adverse effects;DNA damage response |
Issue Date: | 2016 |
Publisher: | Elsevier |
Citation: | Radiotherapy and Oncology, 2016, 119 (2), pp. 244 - 249 |
Abstract: | Aim: To correlate residual double strand breaks (DSB) 24 h after 4 Gy test doses to skin in vivo and to lymphocytes in vitro with adverse effects of earlier breast radiotherapy (RT). Patients and methods: Patients given whole breast RT P5 years earlier were identified on the basis of moderate/marked or minimal/no adverse effects despite the absence (‘RT-Sensitive’, RT-S) or presence (‘RT-Resistant’, RT-R) of variables predisposing to late adverse effects. Residual DSB were quantified in skin 24 h after a 4 Gy test dose in 20 RT-S and 15 RT-R patients. Residual DSB were quantified in lymphocytes irradiated with 4 Gy in vitro in 30/35 patients. Results: Mean foci per dermal fibroblast were 3.29 (RT-S) vs 2.80 (RT-R) (p = 0.137); 3.28 (RT-S) vs 2.60 (RT-R) in endothelium (p = 0.158); 2.50 (RT-S) vs 2.41 (RT-R) in suprabasal keratinocytes (p = 0.633); 2.70 (RT-S) vs 2.35 (RT-R) in basal epidermis (p = 0.419); 12.1 (RT-S) vs 10.3 (RT-R) in lymphocytes (p = 0.0052). Conclusions: Residual DSB in skin following a 4 Gy dose were not significantly associated with risk of late adverse effects of breast radiotherapy, although exploratory analyses suggested an association in severely affected individuals. By contrast, a significant association was detected based on the in vitro response of lymphocytes. |
URI: | http://bura.brunel.ac.uk/handle/2438/18845 |
DOI: | http://dx.doi.org/10.1016/j.radonc.2016.04.012 |
ISSN: | 0167-8140 |
Appears in Collections: | Dept of Life Sciences Research Papers |
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