The chi-square test and Fisher’s exact test indicated that postoperative RCB classification demonstrated a statistically significant correlation with the expression levels of UGCG, BTG2, TNFRSF21, and MYB, as well as lymph node metastasis in BRCA patients prior to NAC (Table 1). The gene discussed is BTG2; the disease is metastatic malignant neoplasm in the lymph nodes.