Nomograms predicting SLN status indicating the need for PMRT

a Probability of at least one sentinel lymph node (SLN) macrometastasis (macro-SLNM) according to current guidelines on use of postmastectomy radiotherapy (PMRT), b probability of more than two macro-SLNMs according to endpoints of ongoing clinical trials aiming to de-escalate the use of irradiation. HER2, human epidermal growth factor receptor 2; PR, progesterone receptor; ER, oestrogen receptor; ILC, invasive lobular carcinoma; NST, carcinoma of no special type.