cT1N0 breast cancer. RNI?

65 yo cT1N0 ER/PR- HER2+ with NA taxol/herceptin. s/p lumpectomy and SLNB, ypT1N1 with 4 mm focus of residual disease in the node. Had she been cT1N1 and ypT1N1 I'd do RNI. Had she been cT1N0 and pT1N1, I'd probably just do WBRT. Wondering if there's a way to not do RNI here.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Radiation Oncology Source Type: forums