Please assess the completion status of the following clinical trial:

Trial Title: Study to Determine the Safety and Efficacy of rFIXFc in Previously Untreated Males With Severe Hemophilia B

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE3
- Number of Arms: 1.0

Eligibility Criteria:
Key Inclusion Criteria:~* Weight \>=3.5 kilogram at the time of informed consent.~* Severe hemophilia B was defined as less than or equal to (\<=)2 International Units per deciliter (IU/dL) (\<=2 percent \[%\]) endogenous FIX documented in the medical record or as tested during the Screening Period.~Key Exclusion Criteria:~* History of positive inhibitor testing. A prior history of inhibitors was defined based on a participant's historical positive inhibitor test using the local laboratory Bethesda value for a positive inhibitor test (that is equal to or above lower limit of detection).~* History of hypersensitivity reactions associated with any rFIXFc administration.~* Exposure to blood components or injection with a coagulation factor IX (FIX) concentrate (including plasma derived) other than rFIXFc.~* Injection with commercially available rFIXFc more than 28 days prior to Screening.~* More than 3 injections of commercially available rFIXFc prior to confirmation of eligibility.~* Other coagulation disorders in addition to hemophilia B.~* Any concurrent clinically significant major disease that, in the opinion of the Investigator, would have made the participant unsuitable for enrollment (example HIV infection with cluster of differentiation 4 (CD4) lymphocyte count less than (\<)200 cells/microliter (mcL) or a viral load greater than (\>)200 particles/mcL, or any other known congenital or acquired immunodeficiency).~* Current systemic treatment with chemotherapy and/or other immunosuppressant drugs. Use of steroids for treatment of asthma or management of acute allergic episodes or otherwise life-threatening episodes was allowed. Treatment in these circumstances should not have exceeded a 14-day duration.~* Participation within the past 30 days in any other clinical study involving investigational treatment.~* Current enrollment in any other clinical study involving investigational treatment.~* Inability to comply with study requirements.~* Other unspecified reasons that, in the opinion of the Investigator or Bioverativ, would have made the participant unsuitable for enrollment.~NOTE: Other protocol-defined inclusion/exclusion criteria may apply.

- Gender: MALE
- Minimum Age: None
- Maximum Age: 17 Years
- Healthy Volunteers: f

Study Arms:
- Recombinant Coagulation Factor IX Fc Fusion Protein (rFIXFc) (Type: EXPERIMENTAL): Participants received rFIXFc intravenous (IV) injection as follows: Prophylactic treatment regimen: started with rFIXFc 50 International Units per kilogram (IU/kg) weekly until a participant reached at least 50 exposure days (ED=24-hour period in which greater than or equal to (\>=1) injection/dose of rFIXFc was given) to rFIXFc, withdrawal from study or end of study. Adjustments to dose and dosing interval was based on incremental recovery, subsequent Factor IX (FIX) levels, physical activity, bleeding pattern, in accordance with local standards of care for prophylactic regimen (PR). Treatment with episodic (on demand) regimen can be initiated before PR at investigators discretion. Episodic (On demand; optional): rFIXFc at individual doses based on participant's clinical condition, type and severity of bleeding event until PR.

Based on this trial design, predict the completion outcome and termination type (if applicable).

Answer: outcome: complete