TNFRSF21 and metastatic malignant neoplasm in the lymph nodes: 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).