These findings indicate that breast stroma tissue outside the incident tumor can be quantified using signal enhancement ratio analysis on dynamic contrast-enhanced MRI. Stromal signal enhancement ratio is a potential indicator for response to treatment and for overall outcome in patients with breast cancer; however, these results should be validated in a prospective study.

APBIb after breast-conserving surgery has been rapidly adopted in the United States. Use varied by race, ethnicity, and widely by region, especially among patients who may not be suitable for this radiation technique.