Study of Recombinant Factor IX Product, IB1001, in Previously Treated Subjects With Hemophilia B

"Prophylaxis (during Treatment and Continuation phases): 40 - 75 IU/kg twice weekly.~The starting dose for prophylaxis may be based on previous recombinant factor IX product use. The recommended starting prophylaxis dose is 40 - 60 IU/kg twice weekly, however, the investigator may prescribe up to 75 IU/kg twice weekly at their discretion (after clinically assessing the subject) and discretion of the subject.~The dose or the frequency of IB1001 prophylaxis may be adjusted at the discretion of the investigator."