Do you consider regional nodal irradiation for women with ER+ breast cancer with a single micrometastasis after lumpectomy and sentinel lymph node sampling?

The data suggest excellent regional control with any approach like no additional treatment (Z11 and IBCSG) or regional nodal RT (AMAROS). Our approach for majority of patients with micromets is to cover level 1 and 2 node in tangential beam ( unless tripe negative then may consider RNI)