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BACKGROUNDSurveillance, Epidemiology, and End Results (SEER) Program registries began collecting new data items, known as site‐specific factors (SSFs), related to breast cancer treatment, prediction, and prognosis under the Collaborative Stage version 2 (CSv2) Data Collection System for cases diagnosed in 2010. The objectives of this report are to: 1) assess the completeness of the new SSFs and discuss...
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