Kinetic measurements of CP-AP in pooled serum specimens of tumor patients and healthy controls. (A) Accumulation of CP-AP correlates with incubation time. Linear regression was calculated from median values of five measurements. Squares: pooled serum specimen from tumor patients. Triangles: pooled serum specimen from healthy controls. The equations of the linear regression and coefficients of determination (R2) are displayed in the graph. (B) Intraday-reproducibility. Inverse correlation of concentrations of CP-AP and coefficients of variations (CVs) for five repetitive measurements. The CVs (y-values) are shown next to the squares in the graph. A logarithmic regression has been calculated with Excel (Microsoft) and the equation and coefficients of determination (R2) are also displayed in the graph.