What technique, total dose, and fractionation do you use for DCIS following lumpectomy with <2 mm negative margins which are not re-excised?  

The recently published SSO/ASTRO/ASCO consensus guideline on DCIS states that "a 2 mm margin minimizes the risk of IBTR compared with smaller negative margins" but "negative margins less than 2 mm alone" are not an indication for re-excision. Furthermore, it says "there is no evidence that margin width, in isolation, should determine radiation delivery technique, fractionation of WBRT, or use/dose of a boost." Thus, there is no guidance on the optimal management for DCIS patients with <2 mm negative margins who are not re-excised. How do you manage these patients? Is hypofractionation acceptable? Is boost indicated, and if so, to what dose?