In patients with positive sentinel lymph nodes, the risk for positive nonsentinel nodes in TNBC patients is significantly lower than in Luminal A and Luminal B patients, but similar to that in HER2 overexpressing patients.30 Freedman et al31 found that TNBC had the lowest risk of nonsentinel lymph node metastasis in breast cancer patients with positive sentinel lymph nodes as compared to other subtypes. Here, ERBB2 is linked to breast cancer.