ERBB2 and breast cancer: The results showed that irregular shape remained an independent predictor of HER2-low breast cancer when compared with HER2-zero (odds ratio [OR] = 3.91, 95% confidence interval [CI]: 1.38–11.05, p = 0.010) and HER2-overexpression (OR = 2.23, 95% CI: 1.29–8.10, p = 0.012).