Hemophilia a, also known as factor viii deficiency, is related to von willebrand disease, type 2 and von willebrand disease, type 3. An important gene associated with Hemophilia a is F8 (Coagulation Factor VIII), and among its related pathways/superpathways are Response to elevated platelet cytosolic Ca2+ and Collagen chain trimerization. The drugs Mometasone furoate and Peginterferon alfa-2a have been mentioned in the context of this disorder. Affiliated tissues include liver and brain, and related phenotypes are arthralgia and joint swelling