CEACAM5 and small cell lung carcinoma: Among patients with NSCLC and SCLC, the average test time during the study period was 2.53 and 4.04 for CEA, 2.12 and 3.61 for Cyfra21‐1, 2.12 and 3.96 for NSE, 1.50 and 2.56 for SCC, and 0.83 and 1.48 for ProGRP, respectively (Figure 2).