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. 2012 Nov 27;12:562. doi: 10.1186/1471-2407-12-562

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Copyright ©2012 Siggelkow et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Metastasis free survival likeliehood statistics as described by Prat et al., [[32]]. To compare the amount of independent prognostic information provided by grading (A) and AURKA (B) we estimated the likelihood ratio statistic in a model that already included AURKA (A) or grading (B). The model shows that AURKA provides significant additional information over grading in the cohort of all patients, as well as in the ER+/HER2- and in the HER2+ subgroups (B). Vice versa, grading provides additional information over AURKA only in the subcohort ofHER2+ patients (A).