Researchers at the University of Oklahoma Health Sciences Center, while studying the mechanics of blood clots, have discovered a new enzyme that not only affects the blood, but seems to play a primary role in how cancer tumors expand and spread throughout the body. A research group at OU led by Patrick McKee first discovered the enzyme called sFAP in plasma. After studying the biochemical makeup of the protein and identifying the gene that controlled its function, they began to search gene sequencing databases worldwide to find what it was.