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Comparisons of (a) CRP, (b) CER, (c) RF, (d) C3, (e) C4, (f) IgG, (g) IgA, and (h) IgM levels among patients with lung cancer, patients with ILD, and healthy individuals. Data expressed as mean ± standard deviation; differences between groups analyzed by Kruskal–Wallis test; P < 0.05 was considered significant. LC: lung cancer (n = 262), ILD: interstitial lung disease (n = 220), normal: healthy individuals (n = 57), CER: ceruloplasmin, CRP: C-reactive protein, RF: rheumatoid factor.
