Clinical trial NCT01623284: PiB PET Scanning in Speech and Language Based Dementias
Official title: PiB PET Scanning in Speech and Language Based Dementias
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE1
Conditions: PPA
Primary Progressive Aphasia
Aphasia
Non-fluent Aphasia
Semantic Dementia
Apraxia of Speech
Primary Progressive Nonfluent Aphasia
Progressive Aphasia
Keywords: aphasia
apraxia of speech
language
Lead sponsor: Mayo Clinic
Sponsor class: OTHER
First posted: 2012-06-19
Enrollment: 168
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: DIAGNOSTIC

Brief summary: The study is designed to determine whether there are clinical features that can be used as biomarkers to predict whether underlying Alzheimer's pathology is the cause of a speech and language based dementia. The primary hypothesis is that the proportion of patients who test positive for beta-amyloid deposition will vary across different speech and language based dementias.

Detailed description: Speech and language based dementias (SLDs) (often referred to as primary progressive aphasias or PPA) are neurodegenerative diseases in which speech or language impairments are the most salient features of the disease and explain deficits in activities of daily living. Patients with SLDs may have poor grammar, prominent anomia, comprehension deficits, speech production and articulation problems, difficulty with repetition of words or sentences, word finding pauses, or a combination of all these features. The SLDs can be further divided into different subtypes. Up to 50% of patients with SLDs that go on to autopsy have shown Alzheimer type pathology where beta-amyloid deposition is observed; the rest have pathology consistent with frontotemporal lobar degeneration where beta-amyloid deposition is absent. Future disease modifying treatments that target beta-amyloid will most likely differ from treatments that do not target beta-amyloid. As a consequence, biomarkers are needed to differentiate patients with SLDs with and without beta-amyloid deposition.

Little research has been done to identify biomarkers that could differentiate patients with SLDs with and without beta-amyloid, mainly because the gold standard to identify the presence of beta-amyloid has been pathological examination, which does not always occur, and may not occur until more than 10 years after onset. The recent development of \[N-methyl-11C\]2-(4'-methylaminophenyl)-6-hydroxybenzothiazole also known as 11C Pittsburgh Compound B or PiB is a solution to this problem since PiB allows the in vivo detection of beta-amyloid. Unfortunately, PiB is very expensive.

The long term goal of our research is to develop a cost effective algorithmic approach to the evaluation and diagnosis of patients presenting with SLDs. The objective of the studies outlined in this proposal is to identify clinical, neuropsychological, or imaging biomarkers that are readily available, relatively inexpensive, and non-invasive that will allow the differentiation of patients with SLDs with and without beta-amyloid deposition. We will use PiB as an indicator of beta-amyloid pathology. Our proposal is predicated upon our strong preliminary data showing that clinical, neuropsychological and radiological features differ between patients with SLDs with and without beta-amyloid deposition. Our central hypothesis is that temporo-parietal lobe findings such as memory loss, visuospatial/perceptual impairment, parietal lobe atrophy on magnetic resonance imaging (MRI), and parietal lobe hypometabolism on \[18-F\]-fluoro-deoxy-glucose positron emission tomography (FDG-PET), will be associated with beta-amyloid deposition (PiB positive status). On-the-other hand, frontal lobe features, such as apraxia of speech and behavioral and executive dysfunction, as well as extrapyramidal features such as Parkinsonism, will be associated with absence of beta-amyloid deposition (PiB negative status). The rationale for examining these clinical-imaging relationships is that successful predictions will provide a solid scientific foundation for the ultimate development of a cost effective algorithm to guide the diagnosis of SLDs.

Patients found to be eligible and willing to enroll in this study will be asked to undergo a Neurologic Examination, a Speech Pathology Consultation, Neuropsychometric testing, an MRI scan, an FDG PET scan and a PiB PET scan of the brain. This will be done over a period of two days at the Mayo Clinic in Rochester, MN.

Eligibility criteria: Inclusion Criteria:

* Over the age of 18
* Has an informant/study partner who will be able to provide independent evaluation of functioning
* Speaks English as their primary language (including bilingual patients whose primary language is English)
* Fulfills diagnostic criteria for PPA (Primary Progressive Aphasia) or Progressive Apraxia of Speech
* Agrees to and is eligible to undergo MRI and PET scanning
* If woman of child bearing age, pt must agree to pregnancy test no more than 48 hours before the PET scans

Exclusion Criteria:

* Any concurrent illnesses that could account for speech and language deficits, such as:

  * traumatic brain injury, strokes and developmental syndromes
  * patients meeting criteria for another neurodegenerative disease (Alzheimer's Disease, Dementia with Lewy Bodies, behavioral variant frontotemporal dementia, progressive supranuclear palsy, corticobasal degeneration)
* Women who is pregnant or post-partum and breast-feeding
* Patients for which MRI is contraindicated (metal in head, cardiac pace maker, etc.), if there is severe claustrophobia, if there are conditions that may confound brain imaging studies (e.g. structural abnormalities, including subdural hematoma or intracranial neoplasm), or if they are medically unstable or are on medications that might affect brain structure or metabolism,(e.g. chemotherapy)
* Patient is mute (secondary to dysarthria only)

Primary outcomes:
measure: Percentage of patients with different speech and language based dementia (SLD) subtypes who have a [N-methyl-11C]2-(4'-methylaminophenyl)-6-hydroxybenzothiazole (PiB) positive positron emission tomography (PET) scan at presentation
timeFrame: Study entry, approximately day 1 or day 2 of study
Secondary outcomes:
measure: Percentage of patients who exhibit apraxia of speech as measured by the Apraxia of Speech Rating Scale at presentation
timeFrame: Study entry, approximately day 1 or day 2 of study
measure: Temporoparietal hypometabolism as shown on [18-F]-fluoro-deoxy-glucose positron emission tomography (FDG-PET) scan at presentation
timeFrame: Study entry, approximately day 1 or day 2 of study
measure: Grey matter loss as shown on magnetic resonance imaging (MRI) at presentation
timeFrame: Study entry, approximately day 1 or day 2 of study
Other outcomes:
Locations:
city: Rochester
country: United States
facility: Mayo Clinic
state: Minnesota
Study officials:
affiliation: Mayo Clinic
name: Keith A Josephs, M.D. MST, MSc
role: PRINCIPAL_INVESTIGATOR
References: