What ratio of lumpectomy cavity volume to normal breast tissue do you consider reasonable for treating a patient with APBI?  

For example, if partial breast RT results in the prescription dose to 80% of the breast, is that reasonable? 50% of the breast? 



Answer from: Radiation Oncologist at Community Practice
Comments
Radiation Oncologist at Mass General Physicians Organization
I am somehow more conservative with the PTV/breast...
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