Analysing the biomarkers as continuous variables, there was no significant association between OS and expressions of ERCC1 (HR 1.0; 95% CI 0.99–1.0; p = 0.34), Lin28a (HR 0.99; 95% CI 0.99–1.0; p = 0.26), Ki-67 (HR 0.99; 95% CI 0.98-1.0; p = 0.18) or Bcl-2 (HR 0.99; 95% CI 0.99–1.0; p = 0.05) in patients with SCLC. Here, MKI67 is linked to small cell lung carcinoma.