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Thor(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.Quadri et al. BMC Cancer (2017) 17:Page 2 ofBackground While advances in the understanding of cancer biology, sc