Why do tumors involve a greater predisposition to blood clotting ?

The pathogenesis of thrombosis in cancer is complex and multifaceted. There are general factors, factors linked to the body’s inflammatory response to the tumor and certain specific properties of the cancer cells, which release substances that inappropriately activate blood coagulation, favoring thrombosis.
One must also bear in mind that the activation of the coagulation system favors tumor growth. This sets in motion a vicious cycle in which the mechanisms of thrombosis contribute to the progression of the cancer.