Univariate logistic regression analysis indicated that the RCB 0/I category was significantly associated with lower BMI (p = 0.032), increased HER2/CEP17 ratio (p = 0.005), higher HER2 gene copy number (p = 0.015), a histological “no special type” (NST) differentiation, presence of a DCIS component (p = 0.014), and negative ER status (p = 0.003). Here, ERBB2 is linked to ductal breast carcinoma in situ.