Bridging Study of C11 Pittsburgh Compound B (PiB) and F18 Flutemetamol Brain Positron Emission Tomography (PET)

Mayo Clinic

Status and phase: Completed; Phase 2

Conditions: Alzheimer's Disease

Treatments: Drug: C11 PiB; Drug: F18 Flutametamol

Study type: Interventional

Funder types: Other

Identifiers

NCT01607476

12-000118

Details and patient eligibility

About

The intent of this research protocol is to test the equivalency of two amyloid imaging drugs (C11 Pittsburgh Compound B and F18 Flutemetamol). The investigators hypothesize that there will be no significant difference in the distribution of the agents to areas of amyloid deposition in the brain or to other normal brain structures. Recent data have shown similarity in the distribution of the drugs in subjects with Alzheimer's disease (AD) or mild cognitive impairment (MCI). No comparison data of the two PET drugs in normal subjects has been published. It is important to understand differences in the images and biodistribution from the two drugs in normal subjects as nonspecific accumulation of the drugs in brain structures such as white matter appear to differ slightly and could affect image performance.

Full description

Some of the current thinking in regards to the pathophysiology of AD involves the production of amyloid Beta protein (AB) by secretase processing of amyloid precursor protein (APP). While AB is thought to be toxic to neurons its role leading to AD pathogenesis, this is not without debate. In any case, it appears that AB forms amyloid plaques that are largely ubiquitous in AD. Neuronal cell death as a result of the disease is another clear pathophysiologic finding. Because of the importance of these findings in the development of AD, targeted therapies are being investigated to selectively inhibit AB production and/or manipulate amyloid load.

Positron emission tomography (PET) is a molecular imaging modality used to noninvasively measure functional processes of the body. A trace amount of a radiopharmaceutical is injected into a patient and the radiopharmaceutical will be taken up or localized in the body as a function of certain biological processes. The detectors of a PET scanner then measure the radiopharmaceutical distribution externally and the reconstructed PET images should represent the true distribution of the radiopharmaceutical within the body.

Enrollment: 89 patients

Sex: All

Ages: 30+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

1. Males or females 30 years of age or older.
2. Subjects who have the clinical diagnosis of probable AD (30) ages 50 and older who have a study partner who is the participant's power of attorney (POA) or legally authorized representative (LAR), cognitive normal elderly (30) age >60 and cognitive normal young subjects (30) ages 30-60.
3. Normal subjects with Clinical Dementia Rating (CDR) 0-0.5 and AD subjects with CDR of 0.5 or greater.

Exclusion criteria

1. Subjects unable to lie down without moving for 30 minutes.
2. Women who are pregnant or who cannot stop breast feeding for 24 hours.
3. Standard safety exclusionary criteria for MRI such as metallic foreign bodies, pacemaker, etc,.
4. Subjects who are too claustrophobic to perform the tests.
5. Subject who have had previous brain irradiation, stroke or brain tumor(s)

Trial design

Primary purpose: Basic Science

Allocation: Non-Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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89 participants in 3 patient groups

Alzheimer's Disease

Experimental group

Description:

Subjects who have the clinical diagnosis of probable AD ages 50 and older who have a study partner who is the participant's power of attorney (POA) or legally authorized representative (LAR). Interventions include C11 PiB PET/CT and F-18 Flutametamol PET/CT with C11 PiB PET/CT performed first.

Treatment:

Drug: F18 Flutametamol

Drug: C11 PiB

Cognitive Normal Elderly

Active Comparator group

Description:

Cognitive Normal subjects who are greater than 60 years of age. Interventions include C11 PiB PET/CT and F-18 Flutametamol PET/CT with C11 PiB PET/CT performed first.

Treatment:

Drug: F18 Flutametamol

Drug: C11 PiB

Cognitive Normal Young

Active Comparator group

Description:

Cognitively normal subjects who are between 30-60 years old. Interventions include C11 PiB PET/CT and F-18 Flutametamol PET/CT with C11 PiB PET/CT performed first.

Treatment:

Drug: F18 Flutametamol

Drug: C11 PiB