Safety Assessment of Leronlimab and Its Effect on Brain Inflammation in Alzheimer's Disease

Participant with a gene variation that would inhibit binding to the PET radiotracer (11C-DPA-713) and/or clinical factors that could affect PET signal, such as chronic use of benzodiazepines or NSAIDS

Women who are pregnant or breastfeeding at screening or baseline

Females of childbearing potential who within 28 days before study entry, did not use a highly effective method of contraception, which includes any of the following: (1) total abstinence, if it is their preferred and usual lifestyle; (2) an intrauterine device or intrauterine hormone-releasing system; (3) a contraceptive implant; (4) an oral contraceptive (with additional barrier method) with the participant being on a stable dose of the same oral contraceptive product for at least 28 days before dosing and throughout the study and for 28 days after study drug discontinuation; (5) have a vasectomized partner with confirmed azoospermia. Women who do not agree to use a highly effective method of contraception (as described above) throughout the entire study period and for 28 days after study drug discontinuation shall be excluded. However, at the discretion of the investigator it is permissible that if a highly effective method of contraception is not appropriate or acceptable to the subject, then the subject must agree to use a medically acceptable method of contraception, i.e., double-barrier methods of contraception such as latex or synthetic condom plus diaphragm or cervical/vault cap with spermicide. NOTE: All females will be considered to be of childbearing potential unless they are postmenopausal (amenorrheic for at least 12 consecutive months, in the appropriate age group, and without other known or suspected cause) or have been sterilized surgically (i.e., bilateral tubal ligation, total hysterectomy, or bilateral oophorectomy, all with surgery at least 1 month before dosing).

Male participants with female partners of childbearing potential are not eligible to participate if they do not agree to ONE of the following from the time prior to first dosing until 90 days after the last dose of study treatment: (1) are abstinent from penile-vaginal intercourse as their usual and preferred lifestyle (abstinent on a long term and persistent basis) and agree to remain abstinent; (2) Agree to use a male condom plus partner use of a contraceptive method with a failure rate of <1% per year when having penile-vaginal intercourse with a partner of childbearing potential who is not currently pregnant. Men with a pregnant or breastfeeding partner are not eligible to participate if they do not agree to remain abstinent from penile-vaginal intercourse or use a male condom during each episode of penile penetration from the time prior to first dosing until 90 days after the last dose of study treatment