Timing of sentinel node procedure (post- versus pre-neoadjuvant chemotherapy) was not significantly associated with final pN0/pN0(i+) status with an OR of 1.18 (95% CI 0.64 - 2.18) after correction for age, clinical tumor status, histology, histological grade, hormone receptor and HER2 status (Table 3). Here, ERBB2 is linked to neoplasm.