Why VPRIV?
VPRIV has been shown to improve hemoglobin (a part of red blood cells that carries oxygen in the blood) concentrations and platelet (cells that help blood to clot) counts, and to reduce the size of an enlarged spleen in people with type 1 Gaucher disease.
In VPRIV clinical trials, specific laboratory measurements were evaluated and not general symptoms of type 1 Gaucher disease.
Study comparing 2 different dosages of VPRIV1,2
At the end of a 12-month study, VPRIV improved several signs of type 1 Gaucher disease in patients who received
60 Units/kg every other week
- A 12-month study in 25 patients with type 1 Gaucher disease, and compared the effectiveness and safety of 2 different dosages of VPRIV (60 Units/kg and 45 Units/kg.
- Patients were randomly selected to receive either dosage of VPRIV every other week until week 51. Each patient received a total of 26 infusions.
- Although not statistically significant, the study also showed a 17% decrease in liver size in patients who received VPRIV 60 Units/kg every other week.
Study comparing VPRIV and imiglucerase1,2
- A 9-month study of 34 patients with type 1 Gaucher disease that compared the safety and effectiveness of imiglucerase versus VPRIV. The primary objective was to compare the effects of VPRIV and imiglucerase on hemoglobin concentrations in patients with type 1 Gaucher disease.
- Patients were randomized to receive either 60 Units/kg imiglucerase or 60 Units/kg VPRIV, every other week.
- The mean treatment difference in change from baseline to 9 months in hemoglobin concentration was 0.1 g/dL.

- This change from baseline demonstrated that VPRIV was at least as effective as imiglucerase in improving hemoglobin concentration.
- Secondary endpoints (platelet counts, spleen volume, and liver volume) improved from baseline in both groups, but the differences between VPRIV and imigucerase were not statistically significant between the two groups after 9 months of treatment.
Study in patients switching from imiglucerase to VPRIV1,2
A range of adult and pediatric patients with type 1 Gaucher disease were safely transitioned from imiglucerase to VPRIV.
- A 12-month, open-label, multinational study in 40 patients who had been receiving treatment with imiglucerase for at least 30 months (dose range 15 Units/kg to 60 Units/kg) and required to have had a stable biweekly dose for at least 6 months prior to enrollment.
- Imiglucerase therapy was stopped and treatment with VPRIV was begun, administered every other week at the same number of units as the patient’s previous imiglucerase dose.
- Clinically stable patients who were switched to VPRIV every other week maintained therapeutic responses from baseline (last treatment with imiglucerase) to 12 months.

Antibody Profile of VPRIV1
Antibodies in the body are produced as a response of the immune system. This response may cause a treatment to stop working or not work as well.
- In clinical studies, 1 of 54 patients treated with VPRIV (who were not previously treated for type 1 Gaucher disease) developed antibodies to VPRIV
- As with all therapeutic proteins, there is the potential of developing antibodies
- It is unknown if the presence of antibodies to VPRIV is associated with a higher risk of infusion reactions
- Antibody test results depend on the type of test performed
- The presence of antibodies may be affected by such factors as:
- Method of testing
- Sample handling
- Timing of sample collection
- Other medications used
- Underlying disease
- Comparing the risks of developing antibodies to VPRIV with that of developing antibodies to other products may be misleading
- Patients with an immune response to other enzyme replacement therapies who are switching to VPRIV should continue to be monitored for antibodies
Be sure to speak with your doctor if you have any questions or concerns about developing antibodies.
References:
1. VPRIV [package insert]. Cambridge, MA: Shire Human Genetic Therapies, Inc.; 2010.
2. Data on file. Shire Human Genetic Therapies, Inc.