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A Phase III, Multicenter, Randomized, Double-Blind, Placebo-Controlled, Parallel-Group, Efficacy, and Safety Study of Gantenerumab in Patients With Early (Prodromal to Mild) Alzheimer’s Disease


Brief Summary:

This randomized, double-blind, placebo-controlled, parallel group study will evaluate the
efficacy and safety of gantenerumab versus placebo in participants with early (prodromal to
mild) AD. All participants must show evidence of beta-amyloid pathology. Eligible
participants will be randomized 1:1 to receive either subcutaneous (SC) injection of
gantenerumab or placebo. The primary efficacy assessment will be performed at the end of the
double blind period at week 116. Participants will then be offered to enter into an
open-label extension (OLE). Participants not willing to go to the OLE will participate in a
long term follow-up period for up to 50 weeks after the last gantenerumab dose.


Key Inclusion criteria:

– Meets National Institute on Aging/Alzheimer’s Association (NIAAA) core clinical
criteria for probable AD dementia or prodromal AD (consistent with the NIAAA
diagnostic criteria and guidelines for mild cognitive impairment)

– Evidence of the AD pathological process, as confirmed by CSF tau/A-beta42or amyloid
PET scan

– Demonstrated abnormal memory function

– MMSE score greater than or equal to 22 (≥ 22)

– Clinical dementia rating-global score (CDR-GS) of 0.5 or 1.0

– Availability of a reliable study partner who accepts to participate in study
procedures throughout the 2 years duration of study

– If receiving symptomatic AD medications, the dosing regimen must have been stable for
3 months prior to screening and until randomization

– For enrollment in the China extension, patients must have residence in mainland China,
Hong Kong, or Taiwan and be of Chinese ancestry

– For women of childbearing potential: agreement to remain abstinent (refrain from
heterosexual intercourse) or use contraceptive methods

Key Exclusion criteria:

– Any evidence of a condition other than AD that may affect cognition

– History of schizophrenia, schizoaffective disorder, major depression, or bipolar

– History or presence of clinically evident systemic vascular disease that in the
opinion of the investigator has the potential to affect cognitive function

– History or presence of clinically evident cerebrovascular disease

– History or presence of posterior reversible encephalopathy syndrome

– History or presence of any stroke with clinical symptoms within the past 12 months, or
documented history within the last 6 months of an acute event that is consistent with
a transient ischemic attack

– History of severe, clinically significant CNS trauma

– History or presence of intracranial mass (e.g., glioma, meningioma) that could
potentially impair cognition

– Presence of infections that affect brain function or history of infections that
resulted in neurologic sequelae

– History or presence of systemic autoimmune disorders that potentially cause
progressive neurologic disease with associated cognitive deficits

– At risk for suicide in the opinion of the investigator

– Alcohol and/or substance abuse or dependants in past 2 years

– Relevant brain hemorrhage, bleeding disorder and cerebrovascular abnormalities

– Any contraindications to brain MRI

– Unstable or clinically significant cardiovascular, kidney or liver disease

– Uncontrolled hypertension

– Unstable or clinically significant cardiovascular disease

– Abnormal thyroid function

– Patients with evidence of folic acid deficiency

Exclusion for Open-Label Extension (OLE):

– Discontinued from study treatment during the double-blind treatment period

– Received any other investigational medication during the double-blind treatment period
or after the end of double-blind treatment

– Participation in the OLE deemed inappropriate by the investigator

– Presence of ARIA-E findings at the Week 104 MRI scan


  • Fullerton Neurology and Headache Center, Fullerton, California, United States, 92835
  • Neurology Center of North Orange County, Fullerton, California, United States, 92835
  • Behavioral Research Specialists, LLC, Glendale, California, United States, 91206
  • Irvine Center for Clinical Research, Irvine, California, United States, 92614
  • UCLA – School of Medicine, VA Medical Center, Los Angeles, California, United States, 90073
  • Pacific Neuroscience Med Grp, Oxnard, California, United States, 93030
  • Desert Valley Research, Redlands, California, United States, 92374
  • Pacific Research Network – PRN, San Diego, California, United States, 92103
  • San Francisco Clinical Research Center, San Francisco, California, United States, 94109
  • Southern California Research LLC, Simi Valley, California, United States, 93065
  • Collaborative Neuroscience Network Inc., Torrance, California, United States, 90502
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