SLC1A5 and neoplasm: Another patient (Fig. 6) with an index tumor GS 4 + 5 = 9 (GGG 5) lesion demonstrated low 18F-fluciclovine uptake of both left index (SUVmax 3.2) and contralateral right lobe tumor where staining intensities were low-to-moderate for ASCT2 and low for LAT1.