Biodistribution of 11C-PIB PET in Alzheimer's Disease, Frontotemporal Dementia, and Cognitively Normal Elderly
试验速览
- 阶段
- 早期 1 期
- 状态
- 终止
- 入组人数
- 2
- 试验地点
- 2
- 主要终点
- The agent 11C-PIB has similar biodistribution outside the brain in AD, FTD, and cognitively normal elderly individuals.
研究概览
简要总结
Alzheimer's disease (AD) is characterized by neuritic plaques, neurofibrillary tangles, and neuronal cell loss. Amyloid plaques are believed to play an integral role in AD. Elevated levels of Aβ in the brain are correlated with cognitive decline.
There are no approved ways to measure amyloid load in humans. Several compounds are under investigation. All of these compounds use radioactive chemical tags for positron emission tomography (PET) imaging. The most promising compound is 11C-PIB, or Pittsburgh Compound-B. This compound can be injected and a PET scan performed. This allows doctors to see the amyloid plaques in the brain, and to use this information to look at other types of dementia to see if there are differences and/or similarities in the plaques.
We will recruit a total of 30 subjects, 10 from each of the following three diagnostic categories: frontotemporal dementia (FTD), Alzheimer's disease, and normal volunteers. All subjects will be given an [18F]fluorodeoxyglucose or FDG-PET scan (if they haven't had one in the past) and a PIB-PET scan.
The overall objective of this project is to study the biodistribution of 11C-PIB using PET imaging in normal elderly volunteers and relevant patient groups.
详细描述
Biomarkers of Alzheimer's disease (AD) have recently become extremely important for a number of reasons: to improve diagnosis, to measure severity of disease, to measure progression of disease, to measure effects of novel disease-modifying drugs and to speed development of these novel experimental drugs by reducing time needed to follow patients, number of patients to be followed per study, and cost of research. (Thal, 2006, Nichols, 2006)
The neuropathology of AD is characterized by neuritic plaques, neurofibrillary tangles, and neuronal cell loss (Braak and Braak, 1997). Amyloid plaques are believed to play an integral role in AD (Selkoe, 1993). Plaques are neurotoxic (Yankner, 1989). Elevated levels of Aβ in the brain are correlated with cognitive decline (Naslund, 2000). Removal of plaques in animal models of AD results in behavioral improvements (Arendash, 2001).
There are no approved in vivo markers of amyloid load in humans. Several compounds with affinity for binding amyloid in vivo are under investigation. All of these compounds use radioactive chemical tags for positron emission tomography (PET) imaging. Attempts at finding non-radioactive amyloid tracers are underway, but still poorly developed. The most promising compound is 11C-PIB. Pittsburgh Compound-B has statistically significant increased retention in AD cortical areas, relative to controls (P<0.05). (Price, 2005) To our knowledge, 11C-PIB imaging has not been compared against frontotemporal dementia (FTD) controls.
We will recruit (from our clinic population), a total of 30 subjects, 10 from each of the following 3 diagnostic categories: frontotemporal dementia, Alzheimer's disease, and normal volunteers. All subjects will be given an FDG-PET scan (if they haven't had one in the past) and a PIB-PET scan.
Objective and Hypothesis:
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Basic Science
- 盲法
- None
入排标准
- 年龄范围
- 30 Years 至 90 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •All participants will be between 30-90 years old, inclusive, clinically characterized as having AD, having FTD, or being cognitively normal controls (NC).
- •All subjects must be willing and able to undergo testing procedures.
- •Cholinesterase inhibitors and memantine - symptomatic drugs approved for AD - will be allowed since these drugs are not expected to significantly affect amyloid load.
- •General inclusion criteria are shown below:
- •Normal subjects: Healthy individuals aged to match AD and FTD groups, who are non-depressed, non-demented, and without a complaint of memory loss. A brief neuropsychological test, the 3MS-R or Modified Mini-Mental State Examination, Revised (Tschanz et al., 2002), will be given to confirm that the subject is not cognitively impaired.
- •FTD subjects: Patients seen in the University of Utah (UU) Cognitive Disorders Clinic (CDC) who have been clinically characterized and meet Neary criteria for frontotemporal dementia (Neary et al., 1998).
- •AD subjects: Patients seen in the UU CDC who have been clinically characterized to meet NINCDS-ADRDA criteria for probable AD (McKhann et al., 1984). These criteria were established in 1984 for diagnosis of AD by the National Institute of Neurological and Communicative Disorders and Stroke (NINCDS) and Alzheimer's Disease and Related Disorders Association (ADRDA).
排除标准
- •Subjects with medical conditions that have a high risk of associated cognitive symptoms such as transient ischemic attack (TIA), stroke, seizures, or head injury with loss of consciousness within five years
- •Subjects with Axis I psychiatric diagnoses other than treated depression
- •Subjects who are not medically stable will be excluded from the study. Examples of medically unstable patients include uncontrolled hypertension, heart/liver/renal failure, and other conditions requiring acute medical attention
- •Subjects cannot have a serum glucose level greater than 180 mg/dl for FDG-PET imaging
- •Subjects who are too claustrophobic to undergo FDG-PET or 11C PIB-PET imaging
- •Subjects who require conscious sedation or anesthesia to undergo FDG-PET or 11C PIB-PET imaging
- •Subjects who are unable to follow instructions to urinate after completing scanning procedures
结局指标
主要结局
The agent 11C-PIB has similar biodistribution outside the brain in AD, FTD, and cognitively normal elderly individuals.
时间窗: 4 months
次要结局
- Patients with AD scanned with 11C-PIB will have higher standardized uptake values (SUVs) than cognitively normal elderly in brain regions where beta amyloid are expected to be over-expressed.(4 months)