SLC6A8 and gastric cancer: Exosomes circ-RanGAP1 regulated 10 target genes (DNA methyltransferase 1 [DNMT1], E2F transcription factor 2 [E2F2], ETS variant transcription factor 4 [ETV4], cytochrome P450 family 19 subfamily A member 1 [CYP19A1], inositol 1,4,5-trisphosphate receptor type 3 [ITPR3], myosin light chain kinase [MYLK], ret proto-oncogene [RET], scavenger receptor class B member 1 [SCARB1], small nuclear ribonucleoprotein polypeptide F [SNRPF], solute carrier family 6 member 8 [SLC6A8]) through sponging hsa-miR-877-3p to promote the progression of gastric cancer (Table 2).