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. 2014 Sep 13;12:285. doi: 10.1186/1477-7819-12-285

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© Yang et al.; licensee BioMed Central Ltd. 2014

This article is published under license to 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 credited. 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.

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Probability of recurrence-free survival of different histologic prognostic groups. (A) In grouping scheme 1, the papillary predominant subtype was designated in the low-grade group, along with lepidic- and acinar predominant subtypes. The low-grade group had significantly lower probability of recurrence (P = 0.005). (B) Grouping scheme 2 combined papillary-, solid- and micropapillary predominant subtypes as the high-grade group. The difference of probability of RFS between the low- and the high-grade groups failed to reach statistical significance (P = 0.181).