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Biogen Reports New Data from Phase 1b Study of Investigational Alzheimer's Disease Treatment Aducanumab

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Results Support Design of Ongoing Phase 3 Studies of Aducanumab for
Early Alzheimer's Disease

Biogen (NASDAQ:BIIB) today announced results from a recently conducted
analysis of the long-term extension (LTE) of its ongoing Phase 1b study
of aducanumab, the company's investigational treatment for early
Alzheimer's disease.

The updated analyses include data from the placebo-controlled period and
LTE for patients treated with aducanumab up to 24 months in the
titration cohort and up to 36 months in the fixed-dose cohorts. The
results are consistent with previously reported analyses from this
ongoing Phase 1b study and support the design of the ongoing Phase 3
studies of aducanumab for early Alzheimer's disease.

The Phase 1b is a randomized, double-blind, placebo-controlled,
multiple-dose study evaluating the safety, tolerability,
pharmacokinetics (PK), pharmacodynamics (PD) and clinical effects of
aducanumab in patients with prodromal or mild Alzheimer's disease. The
study includes fixed dosing at 1, 3, 6 and 10 mg/kg as well as an arm
with a titration regimen.

Phase 1b Long-Term Extension
Patients who completed the
54-week, placebo-controlled period of the Phase 1b study had the option
to continue in the LTE.

The new analyses include 143 patients who remained in the LTE. The LTE
cohorts are small populations:

  • Patients (n=18) initially randomized to the aducanumab titration
    regimen in the 12-month placebo-controlled period and treated up to 24
    months
  • Patients (n=69) initially randomized to aducanumab 3, 6 or 10 mg/kg
    and treated up to 36 months
  • Patients (n=48) who were randomized to placebo or aducanumab 1 mg/kg
    in the placebo-controlled period who were switched to aducanumab 3
    mg/kg or to a 3-6 mg/kg titration regimen in the LTE and treated up to
    24 months
  • Patients (n=8) who were randomized to placebo in the
    placebo-controlled period who were switched to aducanumab 1-3-6-10
    mg/kg titration regimen in the LTE and treated up to 12 months

In the Phase 1b LTE, the most commonly reported adverse events were
headache, fall and amyloid-related imaging abnormalities (ARIA). Of the
185 patients dosed with aducanumab in the Phase 1b study, 46 patients
experienced ARIA-E (edema). There were no new cases of ARIA-E in
patients who continued on the same dose of aducanumab. The incidence of
ARIA-E in patients switching from placebo to aducanumab was consistent
with the incidence reported in the placebo-controlled portion of the
Phase 1b study. Six patients experienced more than one episode of
ARIA-E. These recurrent events were consistent with other ARIA events
reported to date; they were typically asymptomatic, and most patients
continued in the study.

In patients treated up to 24 months in the titration cohort, amyloid
plaque reduction as measured by positron emission tomography (PET) was
consistent with the dose- and time-dependent results observed in the
fixed-dose cohorts. Analyses of exploratory clinical endpoints, Clinical
Dementia Rating sum of boxes (CDR-SB) and the Mini-Mental State
Examination (MMSE), were consistent with the results from the fixed-dose
cohorts and suggest a continued benefit on the rate of clinical decline
during the second year of treatment.

In patients treated up to 36 months, amyloid plaque as measured by PET
continued to decrease in a dose- and time-dependent manner, with amyloid
plaque levels in the 10 mg/kg fixed-dose cohort reaching and remaining
at a level considered below the quantitative cut-point that
discriminates between a positive and negative scan1. At 36
months, analyses of exploratory clinical endpoints CDR-SB and the MMSE
suggest a continued benefit on the rate of clinical decline during the
third year of treatment.

Biogen plans to share more data from these analyses at an upcoming
medical congress.

Phase 3 Clinical Studies
Aducanumab is currently being
evaluated in two global Phase 3 studies, ENGAGE and EMERGE, which are
designed to evaluate its safety and efficacy in slowing cognitive
impairment and the progression of disability in people with early
Alzheimer's disease.

For more information about the Phase 3 studies, including information
about participating centers, visit www.ClinicalTrials.gov
(NCT02477800 or NCT02484547).

About Aducanumab
Aducanumab (BIIB037) is an investigational
drug being developed for the treatment of early AD. Aducanumab is a
human recombinant monoclonal antibody (mAb) derived from a de-identified
library of B cells collected from healthy elderly subjects with no signs
of cognitive impairment or cognitively impaired elderly subjects with
unusually slow cognitive decline using Neurimmune's technology platform
called Reverse Translational Medicine (RTM). Biogen licensed aducanumab
from Neurimmune under a collaborative development and license agreement.

Aducanumab is thought to target aggregated forms of beta amyloid
including soluble oligomers and insoluble fibrils which can form into
amyloid plaque in the brain of AD patients. Based on pre-clinical and
Phase 1b data to date, treatment with aducanumab has been shown to
reduce amyloid plaque levels.

In August 2016 aducanumab was accepted into the European Medicines
Agency's PRIME program. In September 2016 the U.S. Food and Drug
Administration accepted aducanumab into its Fast Track program and in
April 2017 aducanumab was accepted into the Japanese Ministry of Health,
Labour and Welfare's (MHLW) Sakigake Designation System.

About Alzheimer's Disease
Alzheimer's disease (AD) is a
progressive neurodegenerative disorder characterized by cognitive
decline and behavioral disturbances that eventually result in a person's
inability to perform daily activities. In 2010, it was estimated that 25
million individuals were living with AD worldwide2. Evidence
suggests that pathophysiological changes typically begin years prior to
the symptoms that lead to a clinical diagnosis. As the disease
progresses, cognitive impairments, behavioral changes and functional
disability commonly associated with AD begin to manifest.

About Biogen
Through cutting-edge science and medicine,
Biogen discovers, develops and delivers worldwide innovative therapies
for people living with serious neurological and neurodegenerative
diseases. Founded in 1978, Biogen is a pioneer in biotechnology, and
today the company has the leading portfolio of medicines to treat
multiple sclerosis; has introduced the first and only approved treatment
for spinal muscular atrophy; and is at the forefront of neurology
research for conditions including Alzheimer's disease, Parkinson's
disease and amyotrophic lateral sclerosis. Biogen also manufactures and
commercializes biosimilars of advanced biologics. For more information,
please visit www.biogen.com.
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Biogen Safe Harbor
This press release contains
forward-looking statements, including statements about additional
results from the phase 1b study, and the potential clinical effects of
aducanumab. These statements may be identified by words such as
"believe," "expect," "may," "plan," "potential," "will" and similar
expressions, and are based on our current beliefs and expectations. Drug
development and commercialization involve a high degree of risk, and
only a small number of research and development programs result in
commercialization of a product. Results in early stage clinical trials
may not be indicative of full results or results from later stage or
larger scale clinical trials and do not ensure regulatory approval.
Factors which could cause actual results to differ materially from our
current expectations include the risk that we may not fully enroll our
clinical trials or enrollment will take longer than expected, unexpected
concerns may arise from additional data, analysis or results obtained
during our clinical trials, regulatory authorities may require
additional information or further studies, or may fail or refuse to
approve or may delay approval of our drug candidates, the occurrence of
adverse safety events, or we may encounter other unexpected hurdles. For
more detailed information on the risks and uncertainties associated with
our drug development and commercialization activities, please review the
Risk Factors section of our most recent annual or quarterly report filed
with the Securities and Exchange Commission. Any forward-looking
statements speak only as of the date of this press release and we assume
no obligation to update any forward-looking statements.

1 Landau, S. M., Mintun, M. A., Joshi, A. D., Koeppe, R. A.,
Petersen, R. C., Aisen, P. S., Weiner, M. W., Jagust, W. J. and for the
Alzheimer's Disease Neuroimaging Initiative (2012), Amyloid deposition,
hypometabolism, and longitudinal cognitive decline. Ann Neurol., 72:
578–586. doi:10.1002/ana.23650.
2 World Health
Organization Dementia a Public Health Priority. http://www.who.int/mental_health/publications/dementia_report_2012/en/.
Accessed 23 May 2016.

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