Alanine, Serine, Cysteine Transporter 2 (ASCT2), encoded by SLC1A5, mediates a Na+-dependent exchange of glutamine, which is known to drive the growth and proliferation of tumor cells, in the antiport of serine, threonine or asparagine, with a questionable role for cysteine as a substrate [331]. Here, SLC1A5 is linked to neoplasm.