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. 2019 Nov 5;9:1177. doi: 10.3389/fonc.2019.01177

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Copyright © 2019 Astradsson, Sellberg, Berglund, Ehrsson and Laurell.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Growth factor levels before treatment, at 7 weeks after start of treatment, 3 months and 1 year after termination of treatment in patients with head and neck cancer. ^*^, ^**Statistically significant. EGF, epidermal growth factor; FGF-2, fibroblast growth factor 2; VEGF, vascular endothelial growth factor.