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. 2009 Dec 16;10:613. doi: 10.1186/1471-2164-10-613

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Copyright ©2009 Chang 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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ERBB2 protein expression in early and late EECs. (A) Representative immunohistochemical (IHC) staining of ERBB2 protein in primary EEC tissues. Staining results were graded as 0+: undetectable staining in <10% of the tumor cells; 2+: weak to moderate complete membrane staining (indicated by an arrow) in <10% of the tumor cells; 3+: strong complete membrane staining observed in <10% of the tumor cells. EEC cases were categorized as ERBB2-negative (scores 0 and 1+) or positive (scores 2+ and 3+). (B) A histogram summarizing the IHC results on 36 primary EEC tissues stained for ERBB2. A chi square test P value is shown. Case numbers and percentages are also indicated.