SLC7A1 and neoplasm: Moreover, a recent study found that blocking arginine metabolism through cationic amino acid transporter 1 (CAT-1)-dependent arginine uptake inhibition or therapeutic depletion of arginine using rhArg1-PEG, delayed tumor development and prolonged murine survival in neuroblastoma cells, where arginase 2 (ARG2) drives neuroblastoma cell proliferation by regulating arginine metabolism.