<prompt> The deficiency of all the following factors increases the incidence of thrombus formation exceptLipoprotein AProtein CAnti-thrombin IIIProtein-S  <response>: . Because deficiencies of antithrombin III,protein C ,pritein S,factor V of Leiden,thrombophila etc are the causes of thrombus formation. Refer page no 223 of SRBs manual of surgery 5th edition. 