ERBB2 and breast cancer: The same study mentioned above, published by Çolakoğlu MK et al. in 2018, concluded that patients with TNBC (triple-negative) or HER2-positive breast cancer had a significantly higher risk of sentinel lymph node (SLN) metastasis compared with those in the luminal group, with this risk being up to six times greater, particularly for TNBC patients.