Should nodal fields be added to post-mastectomy radiation treatment after neo-adjuvant chemotherapy if there is a CR in the nodes?

There is no good study for this clinical situation. NSABP is conducting a trial where pts who have pCR in clinically positive nodes are being randomised to regional RT vs. no regional RT. In practice, I usually treat for patients with pretreatment clinical N2 disease or have inflammatory breast canc...