Data are presented as median (interquartile range). Data were compared using the Kruskal Wallis test (P-value) + post-hoc Mann-Whitney U test (†,‡,§ P < 0.05; 0.01; 0.001 vs. CG; ║, ¶, ** P < 0.05; 0.01; 0.001 vs. pre-chemo; ††, ‡‡ P < 0.05; 0.01; 0.001 vs. chemo-2) and Friedman (P* value) + post-hoc Wilcoxon test (§§ P < 0.001 vs. pre-chemo, respectively; ║║ P < 0.001 vs. chemo-2). P < 0.05 was considered statistically significant. LTL - leukocyte telomere length. MDA - malondialdehyde. IMA - ischemia-modified albumin. PON1 - paraoxonase 1. CG - control group. SCLC - small cell lung cancer. The gene discussed is ALB; the disease is small cell lung carcinoma.