Additionally, BC cells release extracellular vesicles containing miR‐199b‐5p, which disrupts brain metabolism by interfering with astrocyte through the SLC1A2/EAAT2 axis and affects neuronal metabolism via the SLC38A2/SNAT2 or SLC16A7/MCT2 axis (Figure 5D1). This evidence concerns the gene SLC38A2 and breast cancer.