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Venn diagrams of abnormally increased levels of CER, CRP, and RF in (a) 262 patients with lung cancer and (b) 220 patients with interstitial lung disease. Levels of CER ≥0.42 g/L, CRP ≥0.6 mg/L and RF ≥20 IU/mL were considered to be abnormally increased. CER: ceruloplasmin, CRP: C-reactive protein, RF: rheumatoid factor.
