A Study to Evaluate the Drug Levels, Absolute Bioavailability, Safety, Tolerability, and Immunogenicity of Single-Dose of BMS-986446 in Healthy Adults After Single-dose Administration, and Participants With Early Alzheimer's Disease After Multiple Dose Administration

Age

18–80

Sex

ALL

Healthy volunteers

Accepted

Participants must have a BMI of 18.0 to 35.0 kg/m2.
For Parts A and B: Participants must be healthy as determined by medical history, Physical Examination (PE), neurological examination, vital signs, 12-lead ECG, Columbia Suicide-Severity Rating Scale (C-SSRS), and clinical laboratory evaluations.
For Part C: Participants must meet diagnostic criteria for MCI or mild AD dementia, consistent with the National Institute on Aging and the Alzheimer's Association (NIA-AA) diagnostic criteria.
For Part C: Participants must have an Mini Mental State Examination (MMSE) score of ≥ 20 to 28 (inclusive).
For Part C: Participants must have evidence of positive plasma pTau217.

For Parts A and B: Participants must not have a general history of any clinically significant gastrointestinal, renal, hepatic, broncho-pulmonary, neurological, psychiatric, cardiovascular, endocrinological, immune-mediated disorder, hematological, ongoing allergic disorder requiring treatment, metabolic disorder, cancer, or cirrhosis.
For Parts A and B: Participants must not have donated or lost 500 mL blood or more within 60 days prior to study intervention administration.
For Part C: Participants must not have a neurological condition that in the opinion of the investigator may be contributing to cognitive impairment aside from the AD diagnosis, including but not limited to: Parkinson's disease, vascular dementia, dementia with Lewy bodies, frontotemporal dementia, Huntington's disease, normal pressure hydrocephalus, brain tumor, progressive supranuclear palsy, seizure disorder, subdural hematoma, multiple sclerosis, long COVID, or baseline intellectual disability.
For Part C: Participants must not have any current primary psychiatric diagnosis (eg, major depression, schizoaffective disorder or bipolar disorder) other than AD or symptoms (eg, hallucination or delusions).