Correlation between caspase-8 and biomolecules in serum samples. Correlation of caspase-8 with: (A). Fas receptor (APO1/Fas/CD95). (B). Bcl-2–associated X protein (Bax). (C). Matrix metalloproteinase-9 (MMP-9). Correlation analysis was done using SPPS program. Linear regression line is presented within 95% confidence interval. Coefficients of regression (R2) and statistical significance (P < 0.05) are shown in the graphs.