?:definition
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A pathologic finding about one or more characteristics of esophagus and esophagogastric junction cancer, following the rules of the TNM AJCC v7 classification system. The pathologic classification uses evidence acquired before treatment, supplemented or modified by additional evidence acquired during and from surgery, particularly from pathologic evaluation of the surgical specimen. Pathologic reclassification during and following surgery that has been preceded by chemotherapy and/or radiotherapy is designated by the prefix yp. (from AJCC 7th Ed.)
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