Three multi-center, open-label, non-controlled trials have been conducted to evaluate the safety and efficacy of Novoeight in the control and prevention of breakthrough bleeds, routine prophylaxis and perioperative management in previously treated patients with hemophilia A. The analysis included 213 exposed subjects: 150 adolescents or adult subjects from the age of 12 years (≥150 exposure days) and 63 pediatric subjects below the age of 12 years (≥50 exposure days). Immunocompetent patients with severe hemophilia A (factor VIII activity ≤1%) and no history of FVIII inhibitors were eligible for the trials. A total of 187 out of 213 subjects continued in the safety extension trial. All subjects received preventive treatment every other day or three times weekly at the dose levels described in Table 3. Breakthrough bleeds were treated at the investigator’s discretion aiming for a FVIII activity level above 0.5 IU/mL. Treatment during surgery was at the investigator’s discretion aiming for a FVIII trough activity level above 0.5 IU/mL.
Control and Prevention of Bleeding Episodes
A total of 991 bleeds in 158 subjects were treated with Novoeight. The majority of the bleeds (89%) were of mild/moderate severity, 62% of the bleeds were spontaneous and 72% of the bleeds were localized in joints.
An overall assessment of efficacy was performed by the subject (for home treatment) or study site investigator (for treatment under medical supervision) using a four-point scale of excellent, good, moderate, or none. If the hemostatic response was rated as “excellent” or “good”, the treatment of the bleed was considered a success. If the hemostatic response was rated as “moderate or none” the treatment was considered a failure. Of these 991 bleeds, 838 (84%) were rated excellent or good in their response to treatment with Novoeight and 17 (1.7%) were rated as having no response. A total of 898 (91%) of the bleeds were resolved with one or two injections of Novoeight.
Clinical trials of Novoeight included 79 previously treated patients between one to 16 years of age. The hemostatic efficacy in treatment of bleeds was rated as either “excellent” or “good” on a pre-specified rating scale for 86% of the 244 bleeds reported in 54 subjects.
Routine Prophylaxis
All 213 subjects received Novoeight for routine prophylaxis. The prophylactic regimen for the 150 adolescent and adult subjects consisted of 20-40 IU/kg every other day or 20-50 IU/kg three times per week. The prophylactic regimen for the 63 pediatric subjects consisted of 25-50 IU/kg every other day or 25-60 IU/kg three times per week. The majority of the subjects (>80%) were treated with the three times per week regimen.
The median annualized bleeding rates are provided in Table 6.
Table 6: Annualized Bleeding Rate in All Patients
| Small children 0 - <6 years | Older children 6 - <12 years | Adolescents 12 - <16 years | Adults ≥16 years | Total |
Annualized bleeding rate (median) (IQR) | 2.9 (6.3) | 4.1 (8.6) | 4.4 (6.9) | 3.1 (5.6) | 3.1 (7.3) |
A total of 68 subjects were treated with Novoeight for at least 12 months, including seven subjects <12 years. The ABR was similar for the subjects treated for 12 months when compared to the ABR for the total trial population.
Perioperative Management
A total of 11 surgeries were performed in 11 previously treated subjects between 14 and 55 years of age, of which 10 were major surgeries (five synovectomies, two total hip arthroplasties, one knee replacement, arthroscopy, and circumcision), and one was minor (tooth extraction).
The investigator’s ratings of intra- and post-operative quality of hemostasis for these subjects were “excellent” or “good” for all cases.