Plegridy® (interferon beta-1a)
Drug
Identification Number (DIN); 02444399 (pre-filled syringe or
pre-filled pen)
Biogen Canada Inc.
Plegridy™ (peginterferon beta-1a) is a pegylated form of interferon beta-1a. The pegylation process allows for a longer half-life of the drug and therefore less frequent dosing. Beta interferon occurs naturally in the human body as part of the immune response against foreign agents.
Indications and use
Plegridy is indicated for the treatment of people with
relapsing-remitting MS to reduce the risk of further disability
arising from relapses and decrease the frequency of MS
attacks.The safety and efficacy of Plegridy has not been
established in people with primary and secondary progressive
multiple sclerosis.
It is not known if Plegridy is safe and effective in children
under age 18 or adults over 65.
There are no adequate and well-controlled studies of Plegridy
in pregnant women and it is not known whether Plegridy is
excreted in human milk.
Administration and dosage
Plegridy is injected once every two weeks under the skin (subcutaneously). The medication is available as a pre-filled syringe (Plegridy PS) and pre-filled auto-injector (Plegridy Pen). The recommended dose of Plegridy is 125mcg once every two weeks.
Mechanism of action (MOA)
Although the exact mechanism of action is not known, it is thought that the main effects of Plegridy are to block the activity of certain immune system cells and to reduce the passage of these immune cells into the central nervous system, where they cause inflammation and damage to myelin (the insulating material that protects nerves and helps them work properly).
Side effects*
The most common side effects of Plegridy therapy include
flu-like symptoms (fever, chills, sweating, muscle aches and
tiredness) and injection site reactions (redness or
itching).
This is not a comprehensive list of all possible side effects
of Plegridy. Please see the Plegridy product monograph for a list of
other potentially serious side effects. It is important that
those with MS discuss side effects of any medication they are
considering with their physician. (*Health Canada, product
monograph for Plegridy.)
Clinical trials
Clinical Trials in Relapsing-Remitting MS
ADVANCE
Patients were randomly selected to receive either Plegridy
(taken at a dose of 125mcg via under-the-skin injection once
every two or four weeks) or placebo. Data from the first year
showed that Plegridy, dosed once every two weeks, significantly
reduced annualized relapse rate (ARR) by 36% compared to
placebo. Treatment with Plegridy also significantly reduced the
risk of further disability arising from relapses – as measured
by the Expanded Disability Status Scale (EDSS) – by 38%, and
the number of new or active lesions observed on MRI, compared
to placebo. In year two of the ADVANCE trial, all patients
received Plegridy (placebo patients were randomized to Plegridy
every two or four weeks). Results after two years were
consistent with what was observed after one year.
ATTAIN
The 2-year extension trial included 1,468 people with MS who
continued to take Plegridy for up to a total of three years.
Results of the trial showed that treatment with Plegridy at a
dose of 125mcg via under-the-skin injection once every two
weeks maintained positive efficacy on outcomes including ARR,
the proportion of individuals who experienced a relapse, the
proportion of individuals with 24-week confirmed disability
progression, and MRI measures over a three year period. The
results demonstrates sustained long-term safety and efficacy of
Plegridy.
Cost reimbursement
The price of Plegridy is $22,000 per year. Much of the cost may be reimbursed through private and group health plans for people who meet the prescribing criteria and through provincial drug programs for individuals who meet the prescribing criteria. For more information, speak to your healthcare provider.
Drug support program
Further information for persons with MS is available from Biogen ONETM program at 1-855-MSONE-00 or 1-855-676-6300.
Switching therapies
Individuals are encouraged to discuss their disease management plans with their neurologist, keeping in mind their disease history and treatment goals, to determine whether changing therapies are a suitable option for them. Due to the large number of different MS therapies currently available people with MS should discuss their disease management plans with their MS health care team.
References
Calabresi PA et al. Pegylated interferon beta-1a for relapsing-remitting multiple sclerosis (ADVANCE): a randomised, phase 3, double-blind study. The Lancet. 2014; 13: 657-665.
Arnold DL et al. Effect of peginterferon beta-1a on MRI measures and achieving no evidence of disease activity: results from a randomized controlled trial in relapsing-remitting multiple sclerosis. BMC Neurology. 2014; 14: 240.
Plegridy® is a registered trademark of Biogen Canada Inc.