Does the association between survival and receipt of post-mastectomy radiotherapy vary by age at diagnosis among women with early invasive breast cancer?

Introduction: Clinical trials of post-mastectomy radiotherapy (PMRT) for early invasive breast cancer (EIBC) have included few older women. This study examined whether the association between overall survival (OS) and receipt of PMRT altered with age among women with EIBC, as part of the National Audit of Breast Cancer in Older Patients.