F(stage IV) = 25.678 ∗ ascites − 0.001 ∗ CA724 + 0.002 ∗ CA242 + 9.091 ∗ TT + 0.048 ∗ PLT + 0.33 ∗ CRP + 0.002 ∗ AST − 108.563. The gene discussed is CRP; the disease is Ascites.