CPS1 and central nervous system cancer: The median NAGS, CPS1, and citrin expression was between 1.4- and 4-fold higher in glioblastoma multiforme (GBM, n = 166), glioma (GBMLGG, n = 696), stomach adenocarcinoma (STAD, n = 415), and stomach and esophageal carcinoma (STES, n = 600) (Figure 1A,B).