ERBB2 and neoplasm: Associations between tumor biology (HER2 status, Ki-67 index, and triple-negative subtype) and IBR were examined using χ2 tests, independent samples t-tests, and multivariate logistic regression adjusting for age, BMI, smoking status, comorbidities, neoadjuvant chemotherapy, pathological tumor size (pT), nodal stage (pN), and surgery type.