DEBRA: De-Escalation of Breast Radiation Trial for Hormone Sensitive, HER-2 Negative, Oncotype Recurrence Score Less Than or Equal to 18 Breast Cancer (DEBRA)

Time from randomization to any breast procedure after the initial surgery or last follow-up (expressed as % with intact index breast)

Time from randomization to any invasive IBTR or last follow-up (expressed as percentage of invasive IBTR-free

Time from randomization to any breast cancer recurrence at a local, regional or distant site or last follow-up (expressed as percentage of recurrence-free)

Time from randomization to any cancer occurring at a distant site or last follow-up (expressed as percentage of distant disease-free)

Time from randomization to any death or last follow-up (expressed as percent surviving)