Evaluation of [18F]MPPF as a Brain Tracer of Serotonin Receptor 5HT1a

Approximately 40 subjects with Parkinson disease and 20 healthy control subjects will be
recruited to participate in the 2 Projects in this study. All subjects will undergo written
informed consent and a screening evaluation including baseline clinical laboratory testing,
a baseline physical and neurological evaluation and baseline cognitive evaluations.

Subjects in Project 1 (20 PD and 20 HC subjects) will be asked to undergo a single bolus
injection of [18F]MPPF followed by serial Positron Emission Tomography (PET) imaging scans
and blood sampling for measurement of [18F]MPPF in plasma (both protein bound and free) over
a period of up to 2 hours. The imaging analyses will be performed by an image-processing
specialist who will remain masked to the procedures employed with each imaging acquisition.
The primary imaging outcome measure will be the brain regional distribution volumes
expressed as a brain tissue to plasma ratio of the radioligand, [18F]MPPF. Time to the peak
uptake and amplitude of the peak uptake will be evaluated for all brain regions and the
results for the PD subjects will be compared with the HC subjects.

Subjects participating in Project 2 (20 PD subjects on dopaminergic replacement therapy)
will also undergo a second [18F]MPPF and PET imaging session, identical except that PD
medications will be withheld for approximately 8 hours prior to the imaging session. The
second session will occur greater than 7 days, but not more than 3 months, from the first
imaging session. Initial 'on' medication quantitative outcomes for each brain region will
be compared to the outcomes from the second 'off' medication imaging session to determine
the influence of dopaminergic treatment on 5HT1A activity.

The primary imaging outcome measure will be the brain regional distribution volumes
expressed as a brain tissue to plasma ratio of the radioligand, [18F]MPPF. Time to the peak
uptake and amplitude of the peak uptake will be evaluated for all brain regions and the
results for the PD subjects will be compared with the HC subjects.

PD Subjects

Inclusion Criteria:

- The participant is 30 years or older.

- Written informed consent is obtained.

- Participants have a diagnosis of PD (based on UK Brain Bank Criteria).

- Modified Hoehn and Yahr stage of 1 - 4.

- For females, non-child bearing potential or a negative urine or blood pregnancy test
on day of [18F] CFPyPB injection.

Exclusion Criteria:

- The subject has a clinically significant laboratory value and/or clinically
significant unstable medical or psychiatric illness

- The subject has any disorder that may interfere with drug absorption, distribution,
metabolism, or excretion.

- The subject has evidence of clinically significant gastrointestinal, cardiovascular,
hepatic, renal, hematological, neoplastic, endocrine, neurological, immunodeficiency,
pulmonary, or other disorder or disease.

- Evidence of a stroke or mass lesion in a clinically relevant area that may interfere
with the imaging outcome measure

- Subject treated with medication known to interfere with [18F]MPPF binding in vivo
(e.g. pindolol)

- Subjects with radiation exposure above acceptable levels, i.e. a history of exposure
to any radiation >15 mSv over the past 12 months.

Healthy control subjects

Inclusion criteria:

- The participant is 18 years or older.

- Written informed consent is obtained.

- Negative history of neurological or psychiatric illness based on evaluation by a
research physician.

- For females, non-child bearing potential a negative urine or blood pregnancy test on
day of [18F]MPPF injection.

Exclusion criteria:

- The subject has a clinically significant abnormal laboratory value and/or clinically
significant unstable medical or psychiatric illness.

- The subject has evidence of clinically significant gastrointestinal, cardiovascular,
hepatic, renal, hematological, neoplastic, endocrine, neurological, immunodeficiency,
pulmonary, or other disorder or disease.

- The subject has any disorder that may interfere with drug absorption, distribution,
metabolism, or excretion.

- Evidence of a stroke or mass lesion in a clinically relevant area that may interfere
with the imaging outcome measure

- Subject treated with medication known to interfere with [18F]MPPF binding in vivo
(e.g. pindolol)

- Subjects with radiation exposure above acceptable levels, i.e. a history of exposure
to any radiation >15 mSv over the past 12 months.