A Research Study Investigating Semaglutide in People With Early Alzheimer's Disease (EVOKE Plus)

Prior treatment

• Brain Magnetic resonance imaging (MRI) (or Computed Tomography (CT)) scan suggestive of clinically significant structural CNS (central nervous system) disease confirmed by central read (e.g. cerebral large-vessel disease \[large vessel (cortical) infarcts greater than (\>) 10 milimeter (mm) in diameter\], prior macro-haemorrhage \[greater than 1 cubic centimetre (cm\^3)\], cerebral vascular malformations, cortical hemosiderosis, intracranial aneurism(s), intracranial tumours, changes suggestive of normal pressure hydrocephalus).
• Evidence of a clinically relevant or unstable psychiatric disorder, based on Diagnostic and Statistical Manual of Mental Disorders (DSM-5) criteria, including schizophrenia or other psychotic disorder, or bipolar disorder. A participant with a history of major depression who has not had an episode in the last 24 months before the day of screening and is considered in remission or whose depression is controlled with treatment can be included in the study per investigator's judgement.

Other illness

• Evidence of a relevant neurological disorder other than mild cognitive impairment (MCI) or mild dementia of the Alzheimer's type at screening, including but not limited to Parkinson's disease, Lewy body disease, frontotemporal dementia of any type, Huntington's disease, amyotrophic lateral sclerosis, multiple sclerosis, systemic lupus erythematosus, progressive supranuclear palsy, neurosyphilis, human immunodeficiency virus (HIV), learning disability, intellectual disability, hypoxic cerebral damage, or significant head trauma with loss of consciousness that led to persistent cognitive deficits.

Other

• Brain MRI (or CT) scan suggestive of strategic infarcts defined as bilateral thalamic lacunar infarcts and singular paramedian thalamic infarcts confirmed by central read.

• Male or female, aged 55-85 years (both inclusive) at the time of signing informed consent.
• MCI (mild cognitive impairment) or mild dementia of the Alzheimer's type according to the NIA-AA (National Institute of Aging-Alzheimer's Association) 2018 criteria.
• CDR (Clinical Dementia Rating) global score of 0.5 and CDR of 0.5 or more in at least one of the three instrumental activities of daily living categories (personal care, home \& hobbies, community affairs) Or CDR global score of 1.0
• RBANS (Repeatable Battery for the Assessment of Neuropsychological Status) delayed memory index score of below or equal to (≤) 85
• MMSE (Mini-Mental State Examination) greater than or equal to (≥) 22
• Amyloid positivity established with either amyloid PET (positron emission tomography), CSF (cerebrospinal fluid) Aβ1-42 or CSF Aβ1-42/Aβ1-40.
• If receiving an approved Alzheimer's disease treatment (such as acetylcholinesterase inhibitors, memantine or aducanumab) the dose must have been stable for at least 3 months prior to screening and should not be changed during the study unless medically necessary.