SLC3A2 and neoplasm: High SLC3A2 protein expression was associated with shorter DMFS (p < 0.001, Supplementary Figure 2A) and this was only observed in ER+ high-proliferation and TN tumours (p = 0.04, Supplementary Figure 2C, 2E) but not with other two subtypes (Supplementary Figure 2B, 2D).