EHD1 and thyroid cancer: Other glutamine metabolism-related genes, such as solute carrier family 1 neutral amino acid transporter member 5 (SLC1A5, also known as ASCT2), phosphoserine aminotransferase 1 (PAST1), GPT, and glutamic-oxaloacetic transaminase (GOT), were also highly expressed in thyroid cancer cells (Fig. 1K).