ERBB2 and neoplasm: Supplementary Figure S3 depicts a case of HER2-low with an irregular tumor, an early enhancement rate of 0.84, and an ADC value of 0.83 × 10−3 mm2/s. Supplementary Figure S4 presents a case of HER2-negative status showing peritumoral edema and a rounded tumor, with an early enhancement rate of 0.58 and an ADC value of 0.99 × 10−3 mm2/s.