F8 and hemophilia: Lymphoma is the third most common cancer among children in the United States and Europe.[1–4] Hemophilia is a congenital bleeding disorder characterized by deficiency in the coagulation factors VIII or IX; of all cases, 85% and 15% occur due to factor VIII and IX deficiency, respectively.[5] Simultaneous onset of the 2 diseases is rare except in patients infected with the HIV.[6–9]