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Determining breast cancer axillary surgery within the surveillance epidemiology and end results‐Medicare database

Use of sentinel lymph node biopsy (SLNB) is under‐reported by cancer registries' “Scope of Regional Lymph Node Surgery” variable. In 2011, the Surveillance Epidemiology and End Results (SEER) Program recommended against its use to determine extent of axillary surgery, leaving a gap in the utilization of claims data for breast cancer research. The objective was to develop an algorithm using SEER registry and claims data to classify extent of axillary surgery for breast cancer.