Study of Low Dose Whole Brain Irradiation in the Treatment of Alzheimer's Disease

Phase I Feasibility Study of Low Dose Whole Brain Irradiation in the Treatment of Alzheimer's Disease

Status

Terminated

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT02359864

Enrollment

Registered

2015-02-10

Start date

2019-10-01

Completion date

2021-02-03

Last updated

2023-01-26

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Alzheimer's Disease

Keywords

radiation treatment

Brief summary

This study is designed to assess the safety and toxicity/adverse events associated with the use of low dose fractionated whole brain irradiation in those patients who have been diagnosed with probable Alzheimer's disease according to the National Institute of Neurological and Communicative Disorders and Stroke and the Alzheimer's Disease and Related Disorders Association (NINCDS-ADRDA) criteria. As a secondary goal it will establish whether or not the intervention with low dose whole brain irradiation might change the recognized progression of Alzheimer's Disease. The investigators will also collect information from the florbetaben F 18 Injection (AMYVID®) positron emission tomography (PET) Scans to determine if there is any correlation between neurocognitive/quality of life scores and changes in amyloid plaque size, number and location.

Detailed description

An initial 15 patients will be enrolled in the first treatment scheme (5 daily fractions of 2 Gy) and will be followed for 12 months after completion of treatment to assess safety and any toxicity/adverse events associated with treatment. In Arm 1 the 15 study participants will be enrolled in total at Botsford Radiation Oncology Center and William Beaumont Hospital (Royal Oak Campus). Once a total combined 15 patients are entered this Arm will be closed. The second treatment arm will not be used until the last patient in the first dose arm has completed all follow up. At that point patients #16-30 will be enrolled in the second dose arm (10 daily fractions of 2 Gy). In Arm 2 the 15 study participants will be enrolled in total at both Botsford Hospital Radiation Oncology Center and William Beaumont Hospital (Royal Oak Campus). Once a total combined 15 patients are entered this Arm will be closed. A total of 30 patients will be enrolled and each will be followed for 12 months to assess safety and toxicity/adverse events.

Interventions

RADIATION5 daily fractions of 2 Gy

Whole Brain Irradiation to treat Alzheimer's Disease

RADIATION10 daily fractions of 2 Gy

Whole Brain Irradiation to treat Alzheimer's Disease

Study design

Allocation

NON_RANDOMIZED

Intervention model

SINGLE_GROUP

Primary purpose

TREATMENT

Masking

NONE

Intervention model description

Single group pilot study of radiation treatment. The two arms are sequential dose increase.

Eligibility

Sex/Gender

ALL

Age

55 Years to No maximum

Healthy volunteers

Inclusion criteria

Criteria for Eligibility (All responses must be YES) Inclusion Criteria: Patients must meet all eligibility criteria to be included in the study: 1. Must be 55 years of age or older 2. Patient must meet NINCDS-ADRDA criteria for Alzheimer's Disease 3. Patient must be able to complete Mini-Mental Examination (MMSE) and Alzheimer's Disease Assessment Scale - Cognitive (ADAS-Cog) questionnaire Score Sheets 4. Patient has a Rosen Modified Hachinski Ischemic Score of less than or equal to 4 5. Patient has a MMSE score of between 10-20 6. Patient has estimated survival of greater than 12 months 7. Patient or legally authorized representative must be able to give consent

Exclusion criteria

Patients will be excluded from the study if they meet any of the following criteria: 1. The patient has a history of cancer except non-melanoma skin cancer 2. Patient is taking anti-epileptic medication. 3. Dermatological skin disease of the scalp 4. Patient taking Alzheimer medication within the last 3 months, i.e. Exelon, Aricept, Namenda, Reminyl or Ebixa. 5. Current presence of a clinically significant major psychiatric disorder (e.g. major depressive disorder, bipolar disorder, schizophrenia, etc., according to the Diagnostic and Statistical Manual of Mental Disorders, 4th Edition (DSM-IV)) 6. Patient currently participating in another Clinical Trial. 7. Patient and legally authorized representative unable to give informed consent 8. Patient with history of focal neurological deficits (with the exception of vibratory peripheral neuropathy) 9. Non-Alzheimer dementia 10. Patient has previous history of central nervous system radiation 11. Patient has evidence of substance abuse (alcohol / or other drugs of dependence) during previous 12 months 12. History of subdural hygroma / subdural hematoma 13. History of cerebral infection / hemorrhage. 14. History that the patient is immunocompromised 15. History of seizure activity 16. History of hydrocephalus

Design outcomes

Primary

Measure	Time frame	Description
Common Terminology Toxicity Criteria for Adverse Events (CTCAE) Version 5.0 - 6 Weeks	Baseline to 6 weeks post-treatment	To assess a change from baseline in adverse conditions, utilizing Common Terminology Toxicity Criteria (Version 5.0) assessing skin, eyes, ears, and central nervous system at 6 weeks post-treatment. Each condition/event will be given a score based on severity . The CTCAE displays Grades 1 through 5 with unique clinical descriptions of severity for each adverse event (AE): (Grade 1=1 point, Grade 2=2 points, Grade 3=3 points, Grade 4=4 points. Grade 5=5 points) and event scores added to produce a total patient score. Minimum score is zero, which represents no adverse events. Maximum score is 72. A higher score means a worse outcome. The total patient score at baseline subtracted from the total score at 6 weeks is reported. A positive number indicates an increase in adverse conditions, while a negative number indicates decreased adverse conditions.
Common Terminology Toxicity Criteria (CTCAE) Version 5.0 - 3 Months	Baseline 3 months post-treatment	To assess a change from baseline in adverse conditions, utilizing Common Terminology Toxicity Criteria (Version 5.0) assessing skin, eyes, ears, and central nervous system at 3 months post-treatment. The CTCAE displays Grades 1 through 5 with unique clinical descriptions of severity for each AE: (Grade 1=1 point, Grade 2=2 points, Grade 3=3 points, Grade 4=4 points. Grade 5=5 points) and event scores added to produce a total patient score. Minimum score is zero, which represents no adverse events. Maximum score is 72. A higher score means a worse outcome. The total patient score at baseline subtracted from the total score at 3 months is reported. A positive number indicates an increase in adverse conditions, while a negative number indicates decreased adverse conditions.
Common Terminology Toxicity Criteria (Version 5.0) - 6 Months	6 months post-treatment	To assess a change from baseline in adverse conditions, utilizing Common Terminology Toxicity Criteria (Version 5.0) assessing skin, eyes, ears, and central nervous system at 6 months post-treatment. The CTCAE displays Grades 1 through 5 with unique clinical descriptions of severity for each AE: (Grade 1=1 point, Grade 2=2 points, Grade 3=3 points, Grade 4=4 points. Grade 5=5 points) and event scores added to produce a total patient score. Minimum score is zero, which represents no adverse events. Maximum score is 72. A higher score means a worse outcome. The total patient score at baseline subtracted from the total score at 6 months is reported. A positive number indicates an increase in adverse conditions, while a negative number indicates decreased adverse conditions.
Common Terminology Toxicity Criteria (Version 5.0) - 12 Months	Baseline to12 months post-treatment	To assess a change from baseline in adverse conditions, utilizing Common Terminology Toxicity Criteria (Version 5.0) assessing skin, eyes, ears, and central nervous system at 12 months post-treatment. The CTCAE displays Grades 1 through 5 with unique clinical descriptions of severity for each AE: (Grade 1=1 point, Grade 2=2 points, Grade 3=3 points, Grade 4=4 points. Grade 5=5 points) and event scores added to produce a total patient score. Minimum score is zero, which represents no adverse events. Maximum score is 72. A higher score means a worse outcome. The total patient score at baseline subtracted from the total score at 12 months is reported. A positive number indicates an increase in adverse conditions, while a negative number indicates decreased adverse conditions.

Secondary

Measure	Time frame	Description
Neurocognitive Function - MMSE (Mini Mental Status Exam) 12 Months Change From Baseline	Baseline to 12 months post-treatment	Change at 12 months post-treatment from the pretreatment neurocognitive evaluation utilizing the Mini Mental Status Exam (MMSE) tool; a 30-point questionnaire for assessing cognitive function. Minimum value 0, maximum value 30. Higher score means better outcome. Pretreatment total score subtracted from 12-month total score will be reported.
Neurocognitive Function - ADAS-Cog - 6 Weeks Change From Baseline	Baseline to 6 weeks post-treatment	Change at 6 weeks post-treatment from the pretreatment neurocognitive evaluation utilizing The Alzheimer's Disease Assessment Scale Cognitive Scales (ADAS-Cog), an 11 part questionnaire that provides a weighted score of cognitive function. Minimum score 0, maximum score 70, with higher score indicating worse outcome. Pretreatment total score subtracted from 6-week total score will be reported. Negative numbers indicate an improvement in cognition. Positive numbers indicate a worsening cognition.
Neurocognitive Function - ADAS-Cog - 3 Months Change From Baseline	Baseline to 3 months post-treatment	Change at 3 months post-treatment from the pretreatment neurocognitive evaluation utilizing The Alzheimer's Disease Assessment Scale Cognitive Scales (ADAS-Cog), an 11 part questionnaire that provides a weighted score of cognitive function. Minimum score 0, maximum score 70, with higher score indicating worse outcome. Pretreatment total score subtracted from 3-month total score will be reported. Negative numbers indicate an improvement in cognition. Positive numbers indicate a worsening cognition.
Neurocognitive Function - ADAS-Cog - 6 Months Change From Baseline	Baseline to 6 months post-treatment	Change at 6 months post-treatment from the pretreatment neurocognitive evaluation utilizing The Alzheimer's Disease Assessment Scale Cognitive Scales (ADAS-Cog), an 11 part questionnaire that provides a weighted score of cognitive function. Minimum score 0, maximum score 70, with higher score indicating worse outcome. Pretreatment total score subtracted from 6-month total score will be reported. Negative numbers indicate an improvement in cognition. Positive numbers indicate a worsening cognition.
Neurocognitive Function - ADAS-Cog - 12 Months Change From Baseline	Baseline to 12 months post-treatment	Change at 12 months post-treatment from the pretreatment neurocognitive evaluation utilizing The Alzheimer's Disease Assessment Scale Cognitive Scales (ADAS-Cog), an 11 part questionnaire that provides a weighted score of cognitive function. Minimum score 0, maximum score 70, with higher score indicating worse outcome. Pretreatment total score subtracted from 12-month total score will be reported. Negative numbers indicate an improvement in cognition. Positive numbers indicate a worsening cognition.
Neurocognitive Function - QOL-AD - 6 Weeks Change From Baseline	Baseline to 6 weeks post-treatment	Change at 6 weeks post-treatment from the pretreatment neurocognitive evaluation utilizing The Alzheimer's Quality of Life Questionnaire (QOL-AD) tool; a 13 item assessment with each question scored on a 4 point scale where 1=poor quality of life and 4=excellent quality of life. A cumulative score from all items will be collected (min 13 indicates poor QOL, max 52 indicates excellent QOL) and pretreatment score subtracted from 6-week score. A negative number indicates a decreased quality of life. A positive number indicates an improved quality of life
Neurocognitive Function - QOL-AD - 3 Months Change From Baseline	Baseline to 3 months post-treatment	Change at 3 months post-treatment from the pretreatment neurocognitive evaluation utilizing The Alzheimer's Quality of Life Questionaire (QOL-AD) tool; a 13 item assessment with each question scored on a 4 point scale where 1=poor quality of life and 4=excellent quality of life. A cumulative score from all items will be collected (min 13 indicates poor QOL, max 52 indicates excellent QOL) and pretreatment score subtracted from 3-month score. A negative number indicates a decreased quality of life. A positive number indicates an improved quality of life.
Neurocognitive Function - QOL-AD - 6 Months Change From Baseline	Baseline to 6 months post-treatment	Change at 6 months post-treatment from the pretreatment neurocognitive evaluation utilizing The Alzheimer's Quality of Life Questionaire (QOL-AD) tool; a 13 item assessment with each question scored on a 4 point scale where 1=poor quality of life and 4=excellent quality of life. A cumulative score from all items will be collected (min 13 indicates poor QOL, max 52 indicates excellent QOL) and and pretreatment score subtracted from 6-month score. A negative number indicates a decreased quality of life. A positive number indicates an improved quality of life.
Neurocognitive Function - QOL-AD - 12 Months Change From Baseline	Baseline to 12 months post-treatment	Change at 12 months post-treatment from the pretreatment neurocognitive evaluation utilizing The Alzheimer's Quality of Life Questionaire (QOL-AD) tool; a 13 item assessment with each question scored on a 4 point scale where 1=poor quality of life and 4=excellent quality of life. A cumulative score from all items will be collected (min 13 indicates poor QOL, max 52 indicates excellent QOL) and pretreatment score subtracted from 12-month score. A negative number indicates a decreased quality of life. A positive number indicates an improved quality of life.
Neurocognitive Function - QUALID- 6 Weeks Change From Baseline	Baseline to 6 weeks post-treatment	Change at 6 weeks post-treatment from the pretreatment neurocognitive evaluation utilizing The Quality of Life in Late Stage Dementia (QUALID) tool; an 11 item assessment with each question scored on a 5 point scale completed by caregiver, where 5=poor quality of life and 1=excellent quality of life. A cumulative score from all items will be collected (min 11 indicates excellent quality of life, max 55 indicates poor quality of life) and pretreatment score subtracted from 6-week score. A positive number indicates a decreased quality of life. A negative number indicates an improved quality of life.
Neurocognitive Function - QUALID- 3 Months Change From Baseline	Baseline to 3 months post-treatment	Change at 3 months post-treatment from the pretreatment neurocognitive evaluation utilizing The Quality of Life in Late Stage Dementia (QUALID) tool; an 11 item assessment with each question scored on a 5 point scale completed by a patient or caregiver, where 5=poor quality of life and 1=excellent quality of life. A cumulative score from all items will be collected (min 11 indicates excellent quality of life, max 55 indicates poor quality of life) and pretreatment score subtracted from 3-month score. A positive number indicates a decreased quality of life. A negative number indicates an improved quality of life.
Neurocognitive Function - QUALID- 6 Months Change From Baseline	Baseline to 6 months post-treatment	Change at 6 months post-treatment from the pretreatment neurocognitive evaluation utilizing The Quality of Life in Late Stage Dementia (QUALID) tool; an 11 item assessment with each question scored on a 5 point scale completed by a patient or caregiver, where 5=poor quality of life and 1=excellent quality of life. A cumulative score from all items will be collected (min 11 indicates excellent quality of life, max 55 indicates poor quality of life) and pretreatment score subtracted from 6-month score. A positive number indicates a decreased quality of life. A negative number indicates an improved quality of life.
Florbetaben F 18 Injection (AMYVID) Positron Emission Tomography (PET) Scan: Change in Positive or Negative Determination	Baseline to 4 months post-treatment	The number of patients with a change in amyloid plaque burden on AMYVID PET imaging from baseline to 4 month post-treatment scans, based on an overall positive or negative determination using Eli-Lilly AMYVID criteria. A positive scan indicates moderate to frequent amyloid neuritic plaques. A negative scan indicates sparse to no neuritic plaques.
Florbetaben F 18 Injection (AMYVID) Positron Emission Tomography (PET) Scan: Change From Baseline to 4 Months in Standardized Uptake Value Ratio (SUVr) for Frontal Region of the Brain Compared to Cerebellum	Baseline to 4 months post-treatment	SUVr is a measure of the amount of radiotracer activity bound to beta amyloid plaque in an individual region of brain tissue compared to radiotracer activity in the cerebellum, which is rarely involved by neuritic plaques. An elevated ratio \>1.10 indicates a strong likelihood of significant underlying neuritic plaque burden. The percent change from baseline to 4-month scans in the frontal region is reported (percent change is calculated by subtracting baseline value from 4-month value; the result is then divided by the baseline value and multiplied by 100 to give a percentage). A positive number (percentage) indicates an increase in SUVr and more plaque burden in the frontal region, while a negative number (percentage) indicates a decrease in SUVr and a reduction in plaque burden in the frontal region.
Florbetaben F 18 Injection (AMYVID) Positron Emission Tomography (PET) Scan: Change From Baseline to 4 Months in Standardized Uptake Value Ratio (SUVr) for Parietal Region of the Brain Compared to Cerebellum	Baseline to 4 months post-treatment	SUVr is a measure of the amount of radiotracer activity bound to beta amyloid plaque in an individual region of brain tissue compared to radiotracer activity in the cerebellum, which is rarely involved by neuritic plaques. An elevated ratio \>1.10 indicates a strong likelihood of significant underlying neuritic plaque burden. The percent change from baseline to 4-month scans in the parietal region is reported (percent change is calculated by subtracting baseline value from 4-month value; the result is then divided by the baseline value and multiplied by 100 to give a percentage). A positive number (percentage) indicates an increase in SUVr and more plaque burden in the parietal region, while a negative number (percentage) indicates a decrease in SUVr and a reduction in plaque burden in the parietal region.
Florbetaben F 18 Injection (AMYVID) Positron Emission Tomography (PET) Scan: Change From Baseline to 4 Months in Standardized Uptake Value Ratio (SUVr) for Precuneus Region of the Brain Compared to Cerebellum	Baseline to 4 months post-treatment	SUVr is a measure of the amount of radiotracer activity bound to beta amyloid plaque in an individual region of brain tissue compared to radiotracer activity in the cerebellum, which is rarely involved by neuritic plaques. An elevated ratio \>1.10 indicates a strong likelihood of significant underlying neuritic plaque burden. The percent change from baseline to 4-month scans in the precuneus region is reported (percent change is calculated by subtracting baseline value from 4-month value; the result is then divided by the baseline value and multiplied by 100 to give a percentage). A positive number (percentage) indicates an increase in SUVr and more plaque burden in the precuneus region, while a negative number (percentage) indicates a decrease in SUVr and a reduction in plaque burden in the precuneus region.
Florbetaben F 18 Injection (AMYVID) Positron Emission Tomography (PET) Scan: Change From Baseline to 4 Months in Standardized Uptake Value Ratio (SUVr) for Anterior Cingulate Gyrus Region of the Brain Compared to Cerebellum	Baseline to 4 months post-treatment	SUVr is a measure of the amount of radiotracer activity bound to beta amyloid plaque in an individual region of brain tissue compared to radiotracer activity in the cerebellum, which is rarely involved by neuritic plaques. An elevated ratio \>1.10 indicates a strong likelihood of significant underlying neuritic plaque burden. The percent change from baseline to 4-month scans in the anterior cingulate gyrus region is reported (percent change is calculated by subtracting baseline value from 4-month value; the result is then divided by the baseline value and multiplied by 100 to give a percentage). A positive number (percentage) indicates an increase in SUVr and more plaque burden in the anterior cingulate gyrus region, while a negative number (percentage) indicates a decrease in SUVr and a reduction in plaque burden in the anterior cingulate gyrus region.
Florbetaben F 18 Injection (AMYVID) Positron Emission Tomography (PET) Scan: Change From Baseline to 4 Months in Standardized Uptake Value Ratio (SUVr) for Posterior Cingulate Gyrus Region of the Brain Compared to Cerebellum	Baseline to 4 months post-treatment	SUVr is a measure of the amount of radiotracer activity bound to beta amyloid plaque in an individual region of brain tissue compared to radiotracer activity in the cerebellum, which is rarely involved by neuritic plaques. An elevated ratio \>1.10 indicates a strong likelihood of significant underlying neuritic plaque burden. The percent change from baseline to 4-month scans in the posterior cingulate gyrus region is reported (percent change is calculated by subtracting baseline value from 4-month value; the result is then divided by the baseline value and multiplied by 100 to give a percentage). A positive number (percentage) indicates an increase in SUVr and more plaque burden in the posterior cingulate gyrus region, while a negative number (percentage) indicates a decrease in SUVr and a reduction in plaque burden in the posterior cingulate gyrus region.
Florbetaben F 18 Injection (AMYVID) Positron Emission Tomography (PET) Scan: Change From Baseline to 4 Months in Standardized Uptake Value Ratio (SUVr) for Whole Brain Cortex Compared to Cerebellum	Baseline to 4 months post-treatment	SUVr is a measure of the amount of radiotracer activity bound to beta amyloid plaque in an individual region of brain tissue compared to radiotracer activity in the cerebellum, which is rarely involved by neuritic plaques. An elevated ratio \>1.10 indicates a strong likelihood of significant underlying neuritic plaque burden. The percent change from baseline to 4-month scans in the whole brain cortex relative to cerebellum is reported (percent change is calculated by subtracting baseline value from 4-month value; the result is then divided by the baseline value and multiplied by 100 to give a percentage). A positive number (percentage) indicates an increase in SUVr and more plaque burden in the whole brain cortex relative to cerebellum, while a negative number (percentage) indicates a decrease in SUVr and a reduction in plaque burden in the whole brain cortex relative to cerebellum.
Florbetaben F 18 Injection (AMYVID) Positron Emission Tomography (PET) Scan: Change From Baseline to 4 Months in Standardized Uptake Value Standard Deviation (SUV StdDev) From Normal Patients in SUVr Values for Frontal Region of the Brain	Baseline to 4 months post-treatment	The metric SUV StdDev from normal utilizes a database of age matched, cognitively normal individuals to compare the SUV ratios for individual regions of the brain. An elevated SUV StdDev \> 1.65 indicates a strong likelihood of significant underlying neuritic plaque burden. The percent change from baseline to 4-month scans in the frontal region is reported (percent change is calculated by subtracting baseline value from 4-month value; the result is then divided by the baseline value and multiplied by 100 to give a percentage). A positive number indicates an increase in SUV StdDev and more plaque burden in the frontal region, while a negative number indicates a decrease in SUV StdDev and a reduction in plaque burden in the frontal region
Florbetaben F 18 Injection (AMYVID) Positron Emission Tomography (PET) Scan: Change From Baseline to 4 Months in Standardized Uptake Value Standard Deviation (SUV StdDev) From Normal Patients in SUVr Values for Parietal Region of the Brain	Baseline to 4 months post-treatment	The metric SUV StdDev from normal utilizes a database of age matched, cognitively normal individuals to compare the SUV ratios for individual regions of the brain. An elevated SUV StdDev \> 1.65 indicates a strong likelihood of significant underlying neuritic plaque burden. The percent change from baseline to 4-month scans in the parietal region is reported (percent change is calculated by subtracting baseline value from 4-month value; the result is then divided by the baseline value and multiplied by 100 to give a percentage). A positive number indicates an increase in SUV StdDev and more plaque burden in the parietal region, while a negative number indicates a decrease in SUV StdDev and a reduction in plaque burden in the parietal region.
Florbetaben F 18 Injection (AMYVID) Positron Emission Tomography (PET) Scan: Change From Baseline to 4 Months in Standardized Uptake Value Standard Deviation (SUV StdDev) From Normal Patients in SUVr Values for Precuneus Region of the Brain	Baseline to 4 months post-treatment	The metric SUV StdDev from normal utilizes a database of age matched, cognitively normal individuals to compare the SUV ratios for individual regions of the brain. An elevated SUV StdDev \> 1.65 indicates a strong likelihood of significant underlying neuritic plaque burden. The percent change from baseline to 4-month scans in the precuneus region is reported (percent change is calculated by subtracting baseline value from 4-month value; the result is then divided by the baseline value and multiplied by 100 to give a percentage). A positive number indicates an increase in SUV StdDev and more plaque burden in the precuneus region, while a negative number indicates a decrease in SUV StdDev and a reduction in plaque burden in the precuneus region.
Florbetaben F 18 Injection (AMYVID) Positron Emission Tomography (PET) Scan: Change From Baseline to 4 Months in Standardized Uptake Value Standard Deviation (SUV StdDev) From Normal Patients in SUVr Values for Anterior Cingulate Gyrus Region of the Brain	Baseline to 4 months post-treatment	The metric SUV StdDev from normal utilizes a database of age matched, cognitively normal individuals to compare the SUV ratios for individual regions of the brain. An elevated SUV StdDev \> 1.65 indicates a strong likelihood of significant underlying neuritic plaque burden. The percent change from baseline to 4-month scans in the anterior cingulate gyrus region is reported (percent change is calculated by subtracting baseline value from 4-month value; the result is then divided by the baseline value and multiplied by 100 to give a percentage). A positive number indicates an increase in SUV StdDev and more plaque burden in the anterior cingulate gyrus region, while a negative number indicates a decrease in SUV StdDev and a reduction in plaque burden in the anterior cingulate gyrus region.
Florbetaben F 18 Injection (AMYVID) Positron Emission Tomography (PET) Scan: Change From Baseline to 4 Months in Standardized Uptake Value Standard Deviation (SUV StdDev) From Normal Patients in SUVr Values for Posterior Cingulate Gyrus Region of Brain	Baseline to 4 months post-treatment	The metric SUV StdDev from normal utilizes a database of age matched, cognitively normal individuals to compare the SUV ratios for individual regions of the brain. An elevated SUV StdDev \> 1.65 indicates a strong likelihood of significant underlying neuritic plaque burden. The percent change from baseline to 4-month scans in the posterior cingulate gyrus region is reported (percent change is calculated by subtracting baseline value from 4-month value; the result is then divided by the baseline value and multiplied by 100 to give a percentage). A positive number indicates an increase in SUV StdDev and more plaque burden in the posterior cingulate gyrus region, while a negative number indicates a decrease in SUV StdDev and a reduction in plaque burden in the posterior cingulate gyrus region.
Neurocognitive Function - QUALID- 12 Months Change From Baseline	12 months post-treatment	Change at 12 months post-treatment from the pretreatment neurocognitive evaluation utilizing The Quality of Life in Late Stage Dementia (QUALID) tool; an 11 item assessment with each question scored on a 5 point scale completed by a patient or caregiver, where 5=poor quality of life and 1=excellent quality of life. A cumulative score from all items will be collected (min 11 indicates excellent quality of life, max 55 indicates poor quality of life) and pretreatment score subtracted from 12-month score. A positive number indicates a decreased quality of life. A negative number indicates an improved quality of life.
Neurocognitive Function - MMSE (Mini Mental Status Exam) 6 Weeks Change From Baseline	Baseline to 6 weeks post-treatment	Change at 6 weeks post-treatment from the pretreatment neurocognitive evaluation utilizing the Mini Mental Status Exam (MMSE) tool; a 30-point questionnaire for assessing cognitive function. Minimum value 0, maximum value 30. Higher score means better outcome. Pretreatment total score subtracted from 6-week total score will be reported.
Neurocognitive Function - MMSE (Mini Mental Status Exam) 3 Months Change From Baseline	Baseline to 3 months post-treatment	Change at 3 months post-treatment from the pretreatment neurocognitive evaluation utilizing the Mini Mental Status Exam (MMSE) tool; a 30-point questionnaire for assessing cognitive function. Minimum value 0, maximum value 30. Higher score means better outcome. Pretreatment total score subtracted from 3-month total score will be reported.
Neurocognitive Function - MMSE (Mini Mental Status Exam) 6 Months Change From Baseline	Baseline to 6 months post-treatment	Change at 6 months post-treatment from the pretreatment neurocognitive evaluation utilizing the Mini Mental Status Exam (MMSE) tool; a 30-point questionnaire for assessing cognitive function. Minimum value 0, maximum value 30. Higher score means better outcome. Pretreatment total score subtracted from 6-month total score will be reported.

Countries

United States

Participant flow

Participants by arm

Arm	Count
Cohort One An initial 15 patients will be enrolled in the first treatment scheme (5 daily fractions of 2 Gy) and will be followed for 12 months after completion of treatment to assess safety and any toxicity/adverse events associated with treatment. 15 patients will be enrolled and each will be followed for 12 months to assess safety and toxicity/adverse events. 5 daily fractions of 2 Gy: Whole Brain Irradiation to treat Alzheimer's Disease	2
Cohort Two The second treatment arm will not be used until the last patient in the first dose arm has completed all follow up. At that point patients #16-30 will be enrolled in the second dose arm (10 daily fractions of 2 Gy). 15 patients will be enrolled and each will be followed for 12 months to assess safety and toxicity/adverse events. 10 daily fractions of 2 Gy: Whole Brain Irradiation to treat Alzheimer's Disease	0
Total	2

Withdrawals & dropouts

Period	Reason	FG000	FG001
Overall Study	Withdrawal by Subject	1	0

Baseline characteristics

Characteristic	Total	Cohort One	Cohort Two
Age, Continuous	74.5 years	74.5 years	—
Race (NIH/OMB) American Indian or Alaska Native	0 Participants	0 Participants	0 Participants
Race (NIH/OMB) Asian	0 Participants	0 Participants	0 Participants
Race (NIH/OMB) Black or African American	0 Participants	0 Participants	0 Participants
Race (NIH/OMB) More than one race	0 Participants	0 Participants	0 Participants
Race (NIH/OMB) Native Hawaiian or Other Pacific Islander	0 Participants	0 Participants	0 Participants
Race (NIH/OMB) Unknown or Not Reported	0 Participants	0 Participants	0 Participants
Race (NIH/OMB) White	2 Participants	2 Participants	0 Participants
Region of Enrollment United States	2 Participants	2 Participants	0 Participants
Sex: Female, Male Female	1 Participants	1 Participants	0 Participants
Sex: Female, Male Male	1 Participants	1 Participants	0 Participants

Adverse events

Event type	EG000 affected / at risk	EG001 affected / at risk
deaths Total, all-cause mortality	1 / 2	0 / 0
other Total, other adverse events	2 / 2	0 / 0
serious Total, serious adverse events	0 / 2	0 / 0

Outcome results

Primary

Common Terminology Toxicity Criteria (CTCAE) Version 5.0 - 3 Months

To assess a change from baseline in adverse conditions, utilizing Common Terminology Toxicity Criteria (Version 5.0) assessing skin, eyes, ears, and central nervous system at 3 months post-treatment. The CTCAE displays Grades 1 through 5 with unique clinical descriptions of severity for each AE: (Grade 1=1 point, Grade 2=2 points, Grade 3=3 points, Grade 4=4 points. Grade 5=5 points) and event scores added to produce a total patient score. Minimum score is zero, which represents no adverse events. Maximum score is 72. A higher score means a worse outcome. The total patient score at baseline subtracted from the total score at 3 months is reported. A positive number indicates an increase in adverse conditions, while a negative number indicates decreased adverse conditions.

Time frame: Baseline 3 months post-treatment

Population: No patients were enrolled in Cohort Two

Arm	Measure	Value (MEAN)
Cohort One	Common Terminology Toxicity Criteria (CTCAE) Version 5.0 - 3 Months	1.5 units on a scale

Primary

Common Terminology Toxicity Criteria for Adverse Events (CTCAE) Version 5.0 - 6 Weeks

To assess a change from baseline in adverse conditions, utilizing Common Terminology Toxicity Criteria (Version 5.0) assessing skin, eyes, ears, and central nervous system at 6 weeks post-treatment. Each condition/event will be given a score based on severity . The CTCAE displays Grades 1 through 5 with unique clinical descriptions of severity for each adverse event (AE): (Grade 1=1 point, Grade 2=2 points, Grade 3=3 points, Grade 4=4 points. Grade 5=5 points) and event scores added to produce a total patient score. Minimum score is zero, which represents no adverse events. Maximum score is 72. A higher score means a worse outcome. The total patient score at baseline subtracted from the total score at 6 weeks is reported. A positive number indicates an increase in adverse conditions, while a negative number indicates decreased adverse conditions.

Time frame: Baseline to 6 weeks post-treatment

Population: No patients were enrolled in Cohort Two

Arm	Measure	Value (MEAN)
Cohort One	Common Terminology Toxicity Criteria for Adverse Events (CTCAE) Version 5.0 - 6 Weeks	2 units on a scale

Primary

Common Terminology Toxicity Criteria (Version 5.0) - 12 Months

To assess a change from baseline in adverse conditions, utilizing Common Terminology Toxicity Criteria (Version 5.0) assessing skin, eyes, ears, and central nervous system at 12 months post-treatment. The CTCAE displays Grades 1 through 5 with unique clinical descriptions of severity for each AE: (Grade 1=1 point, Grade 2=2 points, Grade 3=3 points, Grade 4=4 points. Grade 5=5 points) and event scores added to produce a total patient score. Minimum score is zero, which represents no adverse events. Maximum score is 72. A higher score means a worse outcome. The total patient score at baseline subtracted from the total score at 12 months is reported. A positive number indicates an increase in adverse conditions, while a negative number indicates decreased adverse conditions.

Time frame: Baseline to12 months post-treatment

Population: Due to patient withdrawal, only 1 patient with data at 12 months in Cohort 1. No enrollment in Cohort 2

Arm	Measure	Value (MEAN)
Cohort One	Common Terminology Toxicity Criteria (Version 5.0) - 12 Months	0 units on a scale

Primary

Common Terminology Toxicity Criteria (Version 5.0) - 6 Months

To assess a change from baseline in adverse conditions, utilizing Common Terminology Toxicity Criteria (Version 5.0) assessing skin, eyes, ears, and central nervous system at 6 months post-treatment. The CTCAE displays Grades 1 through 5 with unique clinical descriptions of severity for each AE: (Grade 1=1 point, Grade 2=2 points, Grade 3=3 points, Grade 4=4 points. Grade 5=5 points) and event scores added to produce a total patient score. Minimum score is zero, which represents no adverse events. Maximum score is 72. A higher score means a worse outcome. The total patient score at baseline subtracted from the total score at 6 months is reported. A positive number indicates an increase in adverse conditions, while a negative number indicates decreased adverse conditions.

Time frame: 6 months post-treatment

Population: Due to patient withdrawal, only 1 patient in Cohort 1 had 6 month data. No patients enrolled in Cohort 2

Arm	Measure	Value (MEAN)
Cohort One	Common Terminology Toxicity Criteria (Version 5.0) - 6 Months	0 units on a scale

Secondary

Florbetaben F 18 Injection (AMYVID) Positron Emission Tomography (PET) Scan: Change From Baseline to 4 Months in Standardized Uptake Value Ratio (SUVr) for Anterior Cingulate Gyrus Region of the Brain Compared to Cerebellum

SUVr is a measure of the amount of radiotracer activity bound to beta amyloid plaque in an individual region of brain tissue compared to radiotracer activity in the cerebellum, which is rarely involved by neuritic plaques. An elevated ratio \>1.10 indicates a strong likelihood of significant underlying neuritic plaque burden. The percent change from baseline to 4-month scans in the anterior cingulate gyrus region is reported (percent change is calculated by subtracting baseline value from 4-month value; the result is then divided by the baseline value and multiplied by 100 to give a percentage). A positive number (percentage) indicates an increase in SUVr and more plaque burden in the anterior cingulate gyrus region, while a negative number (percentage) indicates a decrease in SUVr and a reduction in plaque burden in the anterior cingulate gyrus region.

Time frame: Baseline to 4 months post-treatment