In patients with pancreatic adenocarcinoma (PAAD), SLC6A14 or SLC25A15 expression alone seemed highly prognostic for lower overall survival (Extended Data Fig. 7c), potentially reflecting an advantage of extracellular serine consumption in the nutrient-deprived microenvironment of this tumor type4. The gene discussed is SLC6A14; the disease is pancreatic adenocarcinoma.