SLC38A7 and cancer: Several investigators have demonstrated that expression and activity of amino acid transporters is increased in cancer cells, including the solute carrier protein superfamily of transporters [35] such as l-type amino acid transporters (LAT1 and LAT3), system ASC amino acid transporter, system X-C transporter-related protein, and amino acid transporter responsible for the activity of system B0,+ (ATB0,+).