Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:With data from the Southwest Oncology Group (SWOG 8794) for the use of adjuvant radiation therapy in high-risk patients (21), and Messing trial results demonstrating an advantage in survival for long-term ADT in lymph node-positive patients (22), good pathologic data are an important step toward multi-modality approach.
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