18F-AV-1451 PET Imaging in Participants Enrolled in the LEARN Study

Participants should meet inclusion and exclusion criteria for the LEARN study, and in
addition:

Inclusion Criteria:

- Male or female that have consented and are currently enrolled in the LEARN protocol;

- Participants who sign an IRB approved informed consent form prior to any study
procedure; and

- Participants who in the opinion of the investigator can tolerate the PET scan
procedures.

Exclusion Criteria:

- Has any condition that, in the investigator's opinion, could increase risk to the
participant, limit the participant's ability to tolerate the experimental procedures,
or interfere with analysis of the data. (For example, participants with chronic back
pain might not be able to lie still during the scanning procedures.);

- Has abnormal findings on physical examination or laboratory screening tests that
suggest the participant might have a condition that could, in the opinion of the
investigator, affect his or her response to the radiopharmaceutical and related
testing procedures;

- Is deemed likely to be unable to perform all of the imaging procedures for any reason;

- Has a history of risk factors for torsades de pointes, including clinically
significant findings on ECG, or is taking medications known to prolong QT interval
such as citalopram ≥ 40 mg/day, disopyramide, dofetilide, ibutilide, procainamide,
quinidine, sotalol, or bepridil; A list of restricted medications will be provided.

- Are females of childbearing potential (extremely unlikely in the LEARN eligible
population ages 65 to 85) who are not surgically sterile, not refraining from sexual
activity or not using reliable methods of contraception. Females of childbearing
potential must not be pregnant (negative serum or urine β-hCG at the time of screening
and negative serum or urine β-hCG on imaging day) or breastfeeding at screening.
Females must agree to avoid becoming pregnant, and both females and males must agree
to refrain from sexual activity or to use reliable contraceptive methods for 24 hours
following administration of 18F-AV-1451 Injection; Males with female partners who are
pregnant or of childbearing potential must agree to refrain from sexual activity for
24 hours following administration of 18F-AV-1451 Injection. Additionally, males must
agree not to donate sperm for 24 hours following administration of 18F-AV-1451
Injection;

- Has hypersensitivity to 18F-AV-1451 or any of its excipients.