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Small tumor size (≤5 mm, T1a) carries an excellent prognosis. Controversy exists over the extent of the variety of treatment approaches. We therefore explored the effect of adjuvant systemic therapy (AST) on recurrence free survival (RFS) and overall survival (OAS) for the group of T1a-tumors. Methods The multicenter study population included 9625 early breast cancer patients, diagnosed between...
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