ERBB2 and ductal breast carcinoma in situ: Considering postoperative characteristics, patients with axillary lymph node metastases exhibited a greater DCIS size than those without axillary lymph node metastases (6.5 cm vs. 4.0 cm, p = 0.002), with less frequent HER2 + subtype (12.5% vs. 40.6%, p = 0.011) (Supplementary Table 2).