SLC38A7 and endometrial cancer: Previously we have shown that BenSer is a more promiscuous amino acid transporter inhibitor than GPNA, and is also capable of inhibiting leucine transport via LAT1/SLC7A5.22 This is consistent with our finding that LAT1 also plays a role in endometrial cancer cell growth,39 and explains the larger effects of BenSer on cell proliferation.