ERBB2 and neoplasm: Based on the univariate analysis of 20 variables for the training set (US tumor size, quantity, shape, orientation, margin contour, main posterior echo, microcalcification, echogenicity pattern, CDFI, HER-2 status, US of the lymph node, aspect ratio, cortical thickness, and central hilum), 14 predictive variables were significantly associated with ALN status (P<0.05).