SLC38A7 and cancer: To fulfil this need, proliferating cancer cells increase amino acid transporter expression to enhance amino acid supply (Bhutia et al., 2015; Liu et al., 2018; Hassanein et al., 2013; DeBerardinis et al., 2008; Jones et al., 2018; Kiyokawa et al., 1996; Krall et al., 2016).