ERBB2 and cancer: The outcome of the subsequent ANC was significantly affected by the number of nodes obtained at SLNB (OR 0.49 for retrieval of more than 1 node), invasive size of the cancer (OR 1.63 for size greater than 20 to 50 mm), surgical treatment (OR 1.34 for mastectomy), HER2 status (OR 0.71 for HER2 positivity), and patient age (OR 1.46 for aged above 70 years) (Table 2).