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Ocrelizumab is associated with lower rates of disease activity and progression in patients with relapsing-remitting multiple sclerosis (MS), compared with interferon beta-1a, according to research published in the New England Journal of Medicine. A separate study published in the same journal indicates that ocrelizumab is associated with lower rates of clinical and MRI progression in patients with primary progressive MS, compared with placebo. Ocrelizumab selectively depletes CD20+ B cells, and both studies provide evidence that B cells contribute to the pathogenesis of MS.
“This is the first drug to show a significant effect in slowing disability progression in a phase III trial in primary progressive MS, and therefore the trial represents a landmark study in the field,” said Peter A. Calabresi, MD, Professor of Neurology at Johns Hopkins University School of Medicine in Baltimore, in an accompanying editorial. The articles and editorial were published online ahead of print December 21, 2016.
Ocrelizumab in Relapsing-Remitting MS
Stephen L. Hauser, MD, Chair of Neurology at the University of California, San Francisco School of Medicine, and colleagues conducted OPERA I and OPERA II, two phase III studies to investigate the safety and efficacy of ocrelizumab, compared with interferon beta-1a, in patients with relapsing-remitting MS. The trials had identical protocols, but were conducted at separate trial sites. Eligible participants were between ages 18 and 55, had an Expanded Disability Status Scale (EDSS) score no greater than 5.5 at screening, a history of relapses, and MRI abnormalities consistent with MS. Patients who previously had received a B-cell-targeted therapy or other immunosuppressive medication were excluded.
A total of 821 patients in OPERA I and 835 patients in OPERA II were randomized to 600 mg of IV ocrelizumab every 24 weeks or to 44 µg of subcutaneous interferon beta-1a three times weekly. The treatment period was 96 weeks. Each trial site had separate treating and examining investigators, all of whom were unaware of participants’ treatment assignments. The primary end point was the annualized relapse rate by 96 weeks. Secondary end points included the proportion of patients with disability progression confirmed at 12 weeks, the mean number of gadolinium-enhancing lesions identified on T1-weighted MRI, and the proportion of patients with disability improvement confirmed at 12 weeks.
The annualized relapse rate at 96 weeks in OPERA I was 0.16 in the ocrelizumab group, compared with 0.29 in the interferon beta-1a group. In OPERA II, the annualized relapse rate was 0.16 in the ocrelizumab group, compared with 0.29 in the interferon beta-1a group. These data suggest a 46% lower annualized relapse rate with ocrelizumab in OPERA I and a 47% lower rate with ocrelizumab in OPERA II.
The mean numbers of gadolinium-enhancing lesions in OPERA I were 0.02 with ocrelizumab versus 0.29 with interferon beta-1a. The numbers in OPERA II were 0.02 with ocrelizumab versus 0.42 with interferon beta-1a. The mean numbers of new or newly enlarged T2 hyperintense lesions in OPERA I were 0.32 with ocrelizumab and 1.41 with interferon beta-1a (ie, 77% fewer lesions with ocrelizumab). The values in OPERA II were 0.33 with ocrelizumab versus 1.90 with interferon beta-1a.
In a pooled analysis, 9.1% of patients in the ocrelizumab group had disability progression confirmed at 12 weeks, compared with 13.6% of patients in the interferon beta-1a group. The percentage of patients with disability improvement confirmed at 12 weeks was 20.7% in the ocrelizumab group, compared with 15.6% in the interferon beta-1a group (ie, a 33% higher rate of improvement with ocrelizumab). The effect of ocrelizumab on the rate of confirmed disability improvement was significant in OPERA I, but nonsignificant in OPERA II.
“Additional and extended studies will be required to determine whether the outcomes observed in these 96-week trials, including a near-complete cessation of new plaque formation, as assessed by MRI of the brain, translate into enhanced protection against accrual of disability over the long term,” said Dr. Hauser.
Ocrelizumab in Progressive MS
To examine the safety and efficacy of ocrelizumab in primary progressive MS, Xavier Montalban, MD, PhD, Chair of the Department of Neurology-Neuroimmunology and Director of the MS Centre of Catalonia at the Vall d’Hebron University Hospital in Barcelona, and colleagues conducted the phase III ORATORIO trial. Eligible patients were between ages 18 and 55 and had an EDSS score between 3.0 and 6.5 at screening. Patients with a history of relapsing-remitting MS, secondary progressive MS, or progressive relapsing MS were excluded, as were patients who had had previous treatment with B-cell-targeted therapies and other immunosuppressive medications. 
Patients were randomized in a 2:1 ratio to receive 600 mg of IV ocrelizumab or matching placebo every 24 weeks. Double-blinded treatment was administered for at least 120 weeks. As in the OPERA trials, each trial site had separate treating and examining investigators. Patients who completed the blinded treatment phase were eligible to enter an open-label extension phase.
The primary end point was the percentage of patients with disability progression confirmed at 12 weeks in a time-to-event analysis. Secondary end points included the percentage of patients with disability progression confirmed at 24 weeks, change in performance on the timed 25-foot walk from baseline to week 120, change in the total volume of brain lesions on T2-weighted MRI from baseline to week 120, change in brain volume from week 24 to week 120, and change in the Physical Component Summary score of the Medical Outcomes Study 36-Item Short-Form Health Survey (SF-36), version 2, from baseline to week 120.
In all, 488 patients received ocrelizumab, and 244 received placebo. A total of 402 patients in the ocrelizumab arm and 174 controls completed the 120-week treatment period. The percentage of patients with 12-week confirmed disability progression was 32.9% with ocrelizumab versus 39.3% with placebo. The data suggest a 24% reduction in the risk of this outcome with ocrelizumab.
The percentage of patients with 24-week confirmed disability progression was 29.6% with ocrelizumab and 35.7% with placebo (ie, a relative risk reduction of 25% with ocrelizumab). The mean change from baseline to week 120 in performance on the timed 25-foot walk was 38.9% with ocrelizumab versus 55.1% with placebo (ie, a relative reduction of 29.3% with ocrelizumab). The researchers found no significant between-group difference in the change in the SF-36 Physical Component Summary score from baseline to week 120.
In addition, the total volume of hyperintense lesions on T2-weighted images from baseline to week 120 decreased with ocrelizumab and increased with placebo (mean percent change, −3.4% vs 7.4%). The adjusted mean percent change in brain volume from week 24 to week 120 was lower with ocrelizumab than with placebo (–0.90% vs –1.09%).
Infusion-related reactions were more common in the ocrelizumab group than among controls. Neoplasms were reported in 11 of 486 patients (2.3%) in the ocrelizumab group and in two of 239 patients (0.8%) in the placebo group. “Safety will continue to be assessed throughout the open-label extension phase,” said Dr. Montalban.
Unknown Mechanism of Action
The mechanism by which B-cell depletion slows disability progression is not fully understood. It “may be multifunctional, because B cells have important roles in antibody secretion, antigen presentation, and the release of effector cytokines,” said Dr. Calabresi. By virtue of their number, B cells may be more important than other antigen-presenting cells in MS.
One potential reason that ocrelizumab showed positive effects in ORATORIO is that the patient population was relatively young (mean age, 45) and had active MRI scans (more than 25% of the population had gadolinium-enhancing lesions). These factors enabled the demonstration of a measurable anti-inflammatory effect of ocrelizumab in patients with inflammation at an early, reversible stage of the disease. “Another possible explanation is that B cells may mediate pathologic processes by secretion of cytokines or by deposition of immunoglobulins after they enter the CNS,” said Dr. Calabresi. “B cells and plasma cells secrete antibodies that may target CNS antigens such as myelin, neurons, and glia, which could accelerate neurodegeneration or inhibit myelin repair. The continued separation of disability progression curves in the ORATORIO trial beyond 52 weeks, when anti-inflammatory effects have been maximized, and success in the relatively noninflammatory disorder of primary progressive MS suggest that additional mechanisms of action may be operational, and further study is warranted.”
Because ocrelizumab appears to entail a higher risk of herpes reactivation and of neoplasms, “clinicians are urged to carefully consider which patients might benefit the most from ocrelizumab and to stay vigilant with regard to monitoring for side effects that could be managed effectively if detected early,” Dr. Calabresi concluded.
—Erik Greb
Suggested Reading
Hauser SL, Bar-Or A, Comi G, et al. Ocrelizumab versus interferon beta-1a in relapsing multiple sclerosis. N Engl J Med. 2016 Dec 21 [Epub ahead of print].
Montalban X, Hauser SL, Kappos L, et al. Ocrelizumab versus placebo in primary progressive multiple sclerosis. N Engl J Med. 2016 Dec 21 [Epub ahead of print].
Calabresi PA. B-cell depletion - a frontier in monoclonal antibodies for multiple sclerosis. N Engl J Med. 2016 Dec 21 [Epub ahead of print].
Ocrelizumab is associated with lower rates of disease activity and progression in patients with relapsing-remitting multiple sclerosis (MS), compared with interferon beta-1a, according to research published in the New England Journal of Medicine. A separate study published in the same journal indicates that ocrelizumab is associated with lower rates of clinical and MRI progression in patients with primary progressive MS, compared with placebo. Ocrelizumab selectively depletes CD20+ B cells, and both studies provide evidence that B cells contribute to the pathogenesis of MS.
“This is the first drug to show a significant effect in slowing disability progression in a phase III trial in primary progressive MS, and therefore the trial represents a landmark study in the field,” said Peter A. Calabresi, MD, Professor of Neurology at Johns Hopkins University School of Medicine in Baltimore, in an accompanying editorial. The articles and editorial were published online ahead of print December 21, 2016.
Ocrelizumab in Relapsing-Remitting MS
Stephen L. Hauser, MD, Chair of Neurology at the University of California, San Francisco School of Medicine, and colleagues conducted OPERA I and OPERA II, two phase III studies to investigate the safety and efficacy of ocrelizumab, compared with interferon beta-1a, in patients with relapsing-remitting MS. The trials had identical protocols, but were conducted at separate trial sites. Eligible participants were between ages 18 and 55, had an Expanded Disability Status Scale (EDSS) score no greater than 5.5 at screening, a history of relapses, and MRI abnormalities consistent with MS. Patients who previously had received a B-cell-targeted therapy or other immunosuppressive medication were excluded.
A total of 821 patients in OPERA I and 835 patients in OPERA II were randomized to 600 mg of IV ocrelizumab every 24 weeks or to 44 µg of subcutaneous interferon beta-1a three times weekly. The treatment period was 96 weeks. Each trial site had separate treating and examining investigators, all of whom were unaware of participants’ treatment assignments. The primary end point was the annualized relapse rate by 96 weeks. Secondary end points included the proportion of patients with disability progression confirmed at 12 weeks, the mean number of gadolinium-enhancing lesions identified on T1-weighted MRI, and the proportion of patients with disability improvement confirmed at 12 weeks.
The annualized relapse rate at 96 weeks in OPERA I was 0.16 in the ocrelizumab group, compared with 0.29 in the interferon beta-1a group. In OPERA II, the annualized relapse rate was 0.16 in the ocrelizumab group, compared with 0.29 in the interferon beta-1a group. These data suggest a 46% lower annualized relapse rate with ocrelizumab in OPERA I and a 47% lower rate with ocrelizumab in OPERA II.
The mean numbers of gadolinium-enhancing lesions in OPERA I were 0.02 with ocrelizumab versus 0.29 with interferon beta-1a. The numbers in OPERA II were 0.02 with ocrelizumab versus 0.42 with interferon beta-1a. The mean numbers of new or newly enlarged T2 hyperintense lesions in OPERA I were 0.32 with ocrelizumab and 1.41 with interferon beta-1a (ie, 77% fewer lesions with ocrelizumab). The values in OPERA II were 0.33 with ocrelizumab versus 1.90 with interferon beta-1a.
In a pooled analysis, 9.1% of patients in the ocrelizumab group had disability progression confirmed at 12 weeks, compared with 13.6% of patients in the interferon beta-1a group. The percentage of patients with disability improvement confirmed at 12 weeks was 20.7% in the ocrelizumab group, compared with 15.6% in the interferon beta-1a group (ie, a 33% higher rate of improvement with ocrelizumab). The effect of ocrelizumab on the rate of confirmed disability improvement was significant in OPERA I, but nonsignificant in OPERA II.
“Additional and extended studies will be required to determine whether the outcomes observed in these 96-week trials, including a near-complete cessation of new plaque formation, as assessed by MRI of the brain, translate into enhanced protection against accrual of disability over the long term,” said Dr. Hauser.
Ocrelizumab in Progressive MS
To examine the safety and efficacy of ocrelizumab in primary progressive MS, Xavier Montalban, MD, PhD, Chair of the Department of Neurology-Neuroimmunology and Director of the MS Centre of Catalonia at the Vall d’Hebron University Hospital in Barcelona, and colleagues conducted the phase III ORATORIO trial. Eligible patients were between ages 18 and 55 and had an EDSS score between 3.0 and 6.5 at screening. Patients with a history of relapsing-remitting MS, secondary progressive MS, or progressive relapsing MS were excluded, as were patients who had had previous treatment with B-cell-targeted therapies and other immunosuppressive medications.
Patients were randomized in a 2:1 ratio to receive 600 mg of IV ocrelizumab or matching placebo every 24 weeks. Double-blinded treatment was administered for at least 120 weeks. As in the OPERA trials, each trial site had separate treating and examining investigators. Patients who completed the blinded treatment phase were eligible to enter an open-label extension phase.
The primary end point was the percentage of patients with disability progression confirmed at 12 weeks in a time-to-event analysis. Secondary end points included the percentage of patients with disability progression confirmed at 24 weeks, change in performance on the timed 25-foot walk from baseline to week 120, change in the total volume of brain lesions on T2-weighted MRI from baseline to week 120, change in brain volume from week 24 to week 120, and change in the Physical Component Summary score of the Medical Outcomes Study 36-Item Short-Form Health Survey (SF-36), version 2, from baseline to week 120.
In all, 488 patients received ocrelizumab, and 244 received placebo. A total of 402 patients in the ocrelizumab arm and 174 controls completed the 120-week treatment period. The percentage of patients with 12-week confirmed disability progression was 32.9% with ocrelizumab versus 39.3% with placebo. The data suggest a 24% reduction in the risk of this outcome with ocrelizumab.
The percentage of patients with 24-week confirmed disability progression was 29.6% with ocrelizumab and 35.7% with placebo (ie, a relative risk reduction of 25% with ocrelizumab). The mean change from baseline to week 120 in performance on the timed 25-foot walk was 38.9% with ocrelizumab versus 55.1% with placebo (ie, a relative reduction of 29.3% with ocrelizumab). The researchers found no significant between-group difference in the change in the SF-36 Physical Component Summary score from baseline to week 120.
In addition, the total volume of hyperintense lesions on T2-weighted images from baseline to week 120 decreased with ocrelizumab and increased with placebo (mean percent change, −3.4% vs 7.4%). The adjusted mean percent change in brain volume from week 24 to week 120 was lower with ocrelizumab than with placebo (–0.90% vs –1.09%).
Infusion-related reactions were more common in the ocrelizumab group than among controls. Neoplasms were reported in 11 of 486 patients (2.3%) in the ocrelizumab group and in two of 239 patients (0.8%) in the placebo group. “Safety will continue to be assessed throughout the open-label extension phase,” said Dr. Montalban.
Unknown Mechanism of Action
The mechanism by which B-cell depletion slows disability progression is not fully understood. It “may be multifunctional, because B cells have important roles in antibody secretion, antigen presentation, and the release of effector cytokines,” said Dr. Calabresi. By virtue of their number, B cells may be more important than other antigen-presenting cells in MS.
One potential reason that ocrelizumab showed positive effects in ORATORIO is that the patient population was relatively young (mean age, 45) and had active MRI scans (more than 25% of the population had gadolinium-enhancing lesions). These factors enabled the demonstration of a measurable anti-inflammatory effect of ocrelizumab in patients with inflammation at an early, reversible stage of the disease. “Another possible explanation is that B cells may mediate pathologic processes by secretion of cytokines or by deposition of immunoglobulins after they enter the CNS,” said Dr. Calabresi. “B cells and plasma cells secrete antibodies that may target CNS antigens such as myelin, neurons, and glia, which could accelerate neurodegeneration or inhibit myelin repair. The continued separation of disability progression curves in the ORATORIO trial beyond 52 weeks, when anti-inflammatory effects have been maximized, and success in the relatively noninflammatory disorder of primary progressive MS suggest that additional mechanisms of action may be operational, and further study is warranted.”
Because ocrelizumab appears to entail a higher risk of herpes reactivation and of neoplasms, “clinicians are urged to carefully consider which patients might benefit the most from ocrelizumab and to stay vigilant with regard to monitoring for side effects that could be managed effectively if detected early,” Dr. Calabresi concluded.
—Erik Greb
Suggested Reading
Hauser SL, Bar-Or A, Comi G, et al. Ocrelizumab versus interferon beta-1a in relapsing multiple sclerosis. N Engl J Med. 2016 Dec 21 [Epub ahead of print].
Montalban X, Hauser SL, Kappos L, et al. Ocrelizumab versus placebo in primary progressive multiple sclerosis. N Engl J Med. 2016 Dec 21 [Epub ahead of print].
Calabresi PA. B-cell depletion - a frontier in monoclonal antibodies for multiple sclerosis. N Engl J Med. 2016 Dec 21 [Epub ahead of print].
Ocrelizumab is associated with lower rates of disease activity and progression in patients with relapsing-remitting multiple sclerosis (MS), compared with interferon beta-1a, according to research published in the New England Journal of Medicine. A separate study published in the same journal indicates that ocrelizumab is associated with lower rates of clinical and MRI progression in patients with primary progressive MS, compared with placebo. Ocrelizumab selectively depletes CD20+ B cells, and both studies provide evidence that B cells contribute to the pathogenesis of MS.
“This is the first drug to show a significant effect in slowing disability progression in a phase III trial in primary progressive MS, and therefore the trial represents a landmark study in the field,” said Peter A. Calabresi, MD, Professor of Neurology at Johns Hopkins University School of Medicine in Baltimore, in an accompanying editorial. The articles and editorial were published online ahead of print December 21, 2016.
Ocrelizumab in Relapsing-Remitting MS
Stephen L. Hauser, MD, Chair of Neurology at the University of California, San Francisco School of Medicine, and colleagues conducted OPERA I and OPERA II, two phase III studies to investigate the safety and efficacy of ocrelizumab, compared with interferon beta-1a, in patients with relapsing-remitting MS. The trials had identical protocols, but were conducted at separate trial sites. Eligible participants were between ages 18 and 55, had an Expanded Disability Status Scale (EDSS) score no greater than 5.5 at screening, a history of relapses, and MRI abnormalities consistent with MS. Patients who previously had received a B-cell-targeted therapy or other immunosuppressive medication were excluded.
A total of 821 patients in OPERA I and 835 patients in OPERA II were randomized to 600 mg of IV ocrelizumab every 24 weeks or to 44 µg of subcutaneous interferon beta-1a three times weekly. The treatment period was 96 weeks. Each trial site had separate treating and examining investigators, all of whom were unaware of participants’ treatment assignments. The primary end point was the annualized relapse rate by 96 weeks. Secondary end points included the proportion of patients with disability progression confirmed at 12 weeks, the mean number of gadolinium-enhancing lesions identified on T1-weighted MRI, and the proportion of patients with disability improvement confirmed at 12 weeks.
The annualized relapse rate at 96 weeks in OPERA I was 0.16 in the ocrelizumab group, compared with 0.29 in the interferon beta-1a group. In OPERA II, the annualized relapse rate was 0.16 in the ocrelizumab group, compared with 0.29 in the interferon beta-1a group. These data suggest a 46% lower annualized relapse rate with ocrelizumab in OPERA I and a 47% lower rate with ocrelizumab in OPERA II.
The mean numbers of gadolinium-enhancing lesions in OPERA I were 0.02 with ocrelizumab versus 0.29 with interferon beta-1a. The numbers in OPERA II were 0.02 with ocrelizumab versus 0.42 with interferon beta-1a. The mean numbers of new or newly enlarged T2 hyperintense lesions in OPERA I were 0.32 with ocrelizumab and 1.41 with interferon beta-1a (ie, 77% fewer lesions with ocrelizumab). The values in OPERA II were 0.33 with ocrelizumab versus 1.90 with interferon beta-1a.
In a pooled analysis, 9.1% of patients in the ocrelizumab group had disability progression confirmed at 12 weeks, compared with 13.6% of patients in the interferon beta-1a group. The percentage of patients with disability improvement confirmed at 12 weeks was 20.7% in the ocrelizumab group, compared with 15.6% in the interferon beta-1a group (ie, a 33% higher rate of improvement with ocrelizumab). The effect of ocrelizumab on the rate of confirmed disability improvement was significant in OPERA I, but nonsignificant in OPERA II.
“Additional and extended studies will be required to determine whether the outcomes observed in these 96-week trials, including a near-complete cessation of new plaque formation, as assessed by MRI of the brain, translate into enhanced protection against accrual of disability over the long term,” said Dr. Hauser.
Ocrelizumab in Progressive MS
To examine the safety and efficacy of ocrelizumab in primary progressive MS, Xavier Montalban, MD, PhD, Chair of the Department of Neurology-Neuroimmunology and Director of the MS Centre of Catalonia at the Vall d’Hebron University Hospital in Barcelona, and colleagues conducted the phase III ORATORIO trial. Eligible patients were between ages 18 and 55 and had an EDSS score between 3.0 and 6.5 at screening. Patients with a history of relapsing-remitting MS, secondary progressive MS, or progressive relapsing MS were excluded, as were patients who had had previous treatment with B-cell-targeted therapies and other immunosuppressive medications.
Patients were randomized in a 2:1 ratio to receive 600 mg of IV ocrelizumab or matching placebo every 24 weeks. Double-blinded treatment was administered for at least 120 weeks. As in the OPERA trials, each trial site had separate treating and examining investigators. Patients who completed the blinded treatment phase were eligible to enter an open-label extension phase.
The primary end point was the percentage of patients with disability progression confirmed at 12 weeks in a time-to-event analysis. Secondary end points included the percentage of patients with disability progression confirmed at 24 weeks, change in performance on the timed 25-foot walk from baseline to week 120, change in the total volume of brain lesions on T2-weighted MRI from baseline to week 120, change in brain volume from week 24 to week 120, and change in the Physical Component Summary score of the Medical Outcomes Study 36-Item Short-Form Health Survey (SF-36), version 2, from baseline to week 120.
In all, 488 patients received ocrelizumab, and 244 received placebo. A total of 402 patients in the ocrelizumab arm and 174 controls completed the 120-week treatment period. The percentage of patients with 12-week confirmed disability progression was 32.9% with ocrelizumab versus 39.3% with placebo. The data suggest a 24% reduction in the risk of this outcome with ocrelizumab.
The percentage of patients with 24-week confirmed disability progression was 29.6% with ocrelizumab and 35.7% with placebo (ie, a relative risk reduction of 25% with ocrelizumab). The mean change from baseline to week 120 in performance on the timed 25-foot walk was 38.9% with ocrelizumab versus 55.1% with placebo (ie, a relative reduction of 29.3% with ocrelizumab). The researchers found no significant between-group difference in the change in the SF-36 Physical Component Summary score from baseline to week 120.
In addition, the total volume of hyperintense lesions on T2-weighted images from baseline to week 120 decreased with ocrelizumab and increased with placebo (mean percent change, −3.4% vs 7.4%). The adjusted mean percent change in brain volume from week 24 to week 120 was lower with ocrelizumab than with placebo (–0.90% vs –1.09%).
Infusion-related reactions were more common in the ocrelizumab group than among controls. Neoplasms were reported in 11 of 486 patients (2.3%) in the ocrelizumab group and in two of 239 patients (0.8%) in the placebo group. “Safety will continue to be assessed throughout the open-label extension phase,” said Dr. Montalban.
Unknown Mechanism of Action
The mechanism by which B-cell depletion slows disability progression is not fully understood. It “may be multifunctional, because B cells have important roles in antibody secretion, antigen presentation, and the release of effector cytokines,” said Dr. Calabresi. By virtue of their number, B cells may be more important than other antigen-presenting cells in MS.
One potential reason that ocrelizumab showed positive effects in ORATORIO is that the patient population was relatively young (mean age, 45) and had active MRI scans (more than 25% of the population had gadolinium-enhancing lesions). These factors enabled the demonstration of a measurable anti-inflammatory effect of ocrelizumab in patients with inflammation at an early, reversible stage of the disease. “Another possible explanation is that B cells may mediate pathologic processes by secretion of cytokines or by deposition of immunoglobulins after they enter the CNS,” said Dr. Calabresi. “B cells and plasma cells secrete antibodies that may target CNS antigens such as myelin, neurons, and glia, which could accelerate neurodegeneration or inhibit myelin repair. The continued separation of disability progression curves in the ORATORIO trial beyond 52 weeks, when anti-inflammatory effects have been maximized, and success in the relatively noninflammatory disorder of primary progressive MS suggest that additional mechanisms of action may be operational, and further study is warranted.”
Because ocrelizumab appears to entail a higher risk of herpes reactivation and of neoplasms, “clinicians are urged to carefully consider which patients might benefit the most from ocrelizumab and to stay vigilant with regard to monitoring for side effects that could be managed effectively if detected early,” Dr. Calabresi concluded.
—Erik Greb
Suggested Reading
Hauser SL, Bar-Or A, Comi G, et al. Ocrelizumab versus interferon beta-1a in relapsing multiple sclerosis. N Engl J Med. 2016 Dec 21 [Epub ahead of print].
Montalban X, Hauser SL, Kappos L, et al. Ocrelizumab versus placebo in primary progressive multiple sclerosis. N Engl J Med. 2016 Dec 21 [Epub ahead of print].
Calabresi PA. B-cell depletion - a frontier in monoclonal antibodies for multiple sclerosis. N Engl J Med. 2016 Dec 21 [Epub ahead of print].
