1. It is used to treat hemophilia B , which affects about 2, 800 people. 2. Testing for factor IX may also be performed if hemophilia B is suspected. 3. Subsequent genetic studies have determined that Alexei had hemophilia B . 4. As the tsesarevich suffered from an incurable disease, hemophilia B , his life expectations were short. 5. Avigen's current project doesn't affect Bayer's Berkeley plant, because the gene therapy is aimed at the less common hemophilia B . 6. Factor IX was discovered in 1952 in a young patient with hemophilia B named Stephen Christmas ( 1947 1993 ). 7. Benefix is designed to treat patients with Hemophilia B , who suffer from a lack of factor IX, which helps the blood coagulate. 8. The blood-clotting research involves hemophilia B , which afflicts about 5, 000 Americans, or 20 percent of all hemophiliacs in the United States. 9. The product is designed to treat patients with Hemophilia B , who suffer from a lack of factor IX, which helps the blood coagulate. 10. DNA testing on the remains of the royal family proved in 2009 that Alexei suffered from hemophilia B , a rarer form of the disease.