The latest disease-modifying therapy, called Ocrevus
(ocrelizumab), was approved in March 2017 for relapsing and primary
progressive forms of MS. Ocrelizumab works differently than other DMTs
for MS in that it selectively depletes B-cells. B-cells are a type of
white blood cell that develops antibodies in response to specific
antigens, a process which helps the immune system to fight invaders.
However, abnormal B-cells may mistakenly produce autoantibodies that
contribute to autoimmune diseases such as multiple sclerosis, rheumatoid
arthritis (RA), lupus, or scleroderma.
Ocrevus is very closely related to the drug Rituxan (rituximab) which
is used to treat certain autoimmune diseases, such as rheumatoid
arthritis and myasthenia gravis, as well as cancers like non-Hodgkin’s
lymphoma and chronic lymphocytic leukemia. Both therapies work in the
same way to alter the immune system. Rituxan is also commonly used
off-label to treat MS, and I have personally used it since 2009.
Ocrelizumab specifically targets and destroys CD20+ B-cells in a way
that serves to lower the immune system. Studies of ocrelizumab
demonstrated that it could reduce relapses by 46 to 47 percent in people
with relapsing MS compared to treatment with subcutaneous interferon
beta-1a. People with primary progressive MS (PPMS) who received
ocrelizumab were 24 percent less likely to experience disability
progression than those who received placebo in a clinical study.
Ocrelizumab is an intravenous infusion therapy which is delivered
twice a year in an infusion center or doctor’s office. The first dose is
divided in half and given as two separate infusions, two weeks apart.
Pre-medications, such as corticosteroids and an antihistamine, are given
in advance to reduce the risk of infusion-related reactions that may
include itchy skin, hives, coughing or wheezing, throat irritation,
flushing, shortness of breath, dizziness, or fatigue. Since ocrelizumab
weakens the immune system, patients are at greater risk of developing
infections. Additional risks include reactivation of the hepatitis B
virus and progressive multifocal leukoencephalopathy.
The decision to switch treatment or not
The MS community has received ocrelizumab with excitement and open arms. I personally know several people who have either
switched to Ocrevus
already or are considering it. Several factors come into play when
making treatment decisions, including comparing efficacy, side effects,
impact on lifestyle, and insurance coverage. Twelve years ago, MS
patients would choose a treatment and stick with it, even if their
disease remained active. Now, patients have options and may switch DMTs
when their disease fails to reach NEDA (
no evidence of disease activity).
Like many people living with multiple sclerosis, I am determined to
do all I can to slow down the disease. Although I might not always
exercise
as much as I should or I might indulge in rich food on occasion, I
still try to focus on healthy lifestyle habits and reduce stress. An
important part of fighting this disease for me is to consistently use a
disease-modifying therapy.
Read this post in its entirety:
Why I Am Not Considering Ocrevus?