SELP and deep vein thrombosis: The Vienna Cancer and Thrombosis Study (CATS) score is an expanded risk model based on the Khorana score but utilizes D-dimer and soluble P-selectin as additional biomarkers with 1 point assigned to elevated P-selectin (≥53.1 ng/mL) and 1 point to elevated D-Dimer (≥1.44 μg/mL).