The mean minimum ADC was significantly lower in HER2-low breast cancer (0.94 (0.85, 1.06) × 10−3 mm2/s) than in HER2-negative breast cancer (1.00 (0.90, 1.12) × 10−3 mm2/s) (FDR-adjusted p-value = 0.01). This evidence concerns the gene ERBB2 and breast carcinoma.