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The following clinicopathological factors were extracted from the SEER database: age at diagnosis, ethnicity, tumor size (T stage), histological grade, lymph node staging (N stage), surgical procedures, and hormone receptor status. Lymph node stage was based on the number of metastatic lymph nodes, according to the current Union for International Cancer Control/American Joint Committee on Cancer staging system.
Copyright and License information: ©2017 Wu et al. This work is published and licensed by Dove Medical Press Limited
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