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Comparison of concentrations of the 3 tumor markers between fresh serum and plasma using Passing-Bablok regression and difference plots in healthy individuals. (A) pro-gastrin-releasing peptide (proGRP): slope, 1.32; intercept, 9.62; mean difference, + 18.8. (B) squamous cell cancer antigen (SCC): slope, 1.00; intercept, 0.00; mean difference, + 0.1. (C) neuron- specific enolase (NSE): slope, 0.72; intercept, -2.99; mean difference, -5.9.
