Additionally, higher CEA levels correlated with notably poorer PFS in various cancer types (GTC: HR = 1.52, 95% CI: 1.21–1.91, p < 0.001; NSCLC: HR = 1.94, 95% CI: 1.53–2.46, p < 0.001). This evidence concerns the gene CEACAM5 and non-small cell lung carcinoma.