The prognosis of breast cancer patients has greatly improved in recent decades. Innovations in imaging techniques, pathological assessment, optimized surgical and radiotherapy techniques have contributed to this. Much of the improvement is due to the increase of the range of effective systemic treatment and the continual expansion of the indication for this purpose. However, broadening the guidelines for adjuvant systemic treatments, results in a smaller absolute gain. The balance between effectiveness and side-effects could therefore be compromised, which is an incentive to search for possibilities for de-escalation to prevent potential damage, without unnecessarily increasing the risk of recurrence. Currently, in The Netherlands this is being investigated in older breast cancer patients.

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