ERBB2 and neoplasm: The peritumor/tumor ADC ratio was significantly associated with tumor size (p < 0.001), histological grade (p = 0.005), Ki-67 index (p = 0.006), axillary LNM (p = 0.001), and LVI (p = 0.006), but was not associated with ER status (p = 0.931), PR status (p = 0.160), or HER2 status (p = 0.259).