Similar results were also found in an additional NSCLC cell line (H1838) (Figure 1C upper panel, EP4 siRNA 0.819 ± 0.073 vs 1.000 ± 0.039, P < 0.01; control siRNA 0.999 ± 0.020 vs 1.000 ± 0.039, P > 0.05; Figure 1D). Here, PTGER4 is linked to non-small cell lung carcinoma.