As revealed in Table 2, there were no associations between NK1R expression level and age, breast cancer molecular subtype, tumor volume, TNM stage, pT stage, pN stage, distant metastasis, axillary lymph node metastasis or lymphovascular invasion, ER, PR and HER2 statuses, DCIS history, family history, or type of therapy. This evidence concerns the gene ERBB2 and ductal breast carcinoma in situ.