As shown in Table 1, in human lung adenocarcinoma (TCGA, PanCancer Atlas, 510 patients/samples), CD274 mRNA levels are positively correlated with COX1 (PTGS1), EP2 (PTGER2), EP4 (PTGER4), and DP (PTGDR) with Spearman’s or Pearson’s coefficients over 0.3 and the coefficient of determination (R2) over 0.1. Here, PTGER4 is linked to lung adenocarcinoma.