Clinical Trials

Inclusion Criteria:

1. Men and women aged 40-75 years at Screening.

2. Participant or participant's legally authorized representative (where applicable) is willing and able to provide written informed consent.

3. Clinical diagnosis of nfvPPA by consensus criteria [Gorno-Tempini et al, 2011].

   • At least one of the following core features must be present:

1. Agrammatism in language production 2. Effortful, halting speech with inconsistent speech sound errors and distortions (apraxia of speech)

• At least 2 of 3 of the following other features must be present:

  1. Impaired comprehension of syntactically complex sentences

  2. Spared single-word comprehension

  3. Spared object knowledge

  4. Global CDR® plus NACC FTLD score of 0.5 or 1 during Screening.

  5. CDR® plus NACC FTLD language domain score of 0.5, 1 or 2 during Screening.

  6. Normal or corrected eyesight and auditory abilities, sufficient to perform all aspects of the study scales and assessments.

  7. Fluent in English, per Investigator judgement.

  8. Must have reliable study partner that is able to attend all study visits with participant. Study partner must be able to read, write, and understand the English language.

Exclusion Criteria:

1. Brain MRI incompatible with a diagnosis of nfvPPA.

2. History or evidence of a central nervous system (CNS) condition other than nfvPPA which may cause symptoms of aphasia or dementia, including but not limited to Alzheimer's disease (AD), Dementia with Lewy Bodies (DLB), inflammatory/demyelinating CNS conditions, Creutzfeldt Jakob disease, vascular dementia, post-stroke dementia, etc.

3. History or evidence of any significant neurological disorder other than nfvPPA, including but not limited to, any condition likely to be associated with increased intracranial pressure, space occupying brain lesion, history of epilepsy, cerebral aneurysm, Parkinson's disease, Huntington's chorea, Wernicke's encephalopathy, multiple sclerosis, all variants of previous stroke, corticobasal syndrome, and progressive supranuclear palsy, significant head trauma with loss of consciousness for greater than or equal to 5 minutes in the previous 6 months.

4. History of or currently suffering from a significant psychiatric illness such as schizophrenia, any type of psychotic disorder, bipolar affective disorder, or major depressive disorder.

5. Metabolic or toxic encephalopathy or dementia due to a general medical condition.

6. History of previous neurosurgery to the brain within the past five years.

7. Suicidality, defined as active suicidal thoughts within 6 months before Screening or at Baseline, defined as answering yes to items 4 or 5 on the C-SSRS, or history of suicide attempt in previous 2 years, or, in the Investigator's opinion, at serious risk of suicide.

8. History of learning difficulties that may interfere with their ability to complete the study scales and assessments.

9. Diagnosis of alcohol or drug abuse within the previous 2 years.

10. Poorly controlled clinically significant medical illness, such as hypertension; myocardial infarction within 6 months; uncompensated congestive heart failure or other significant cardiovascular, pulmonary, renal, liver, infectious disease, immune disorder, or metabolic/endocrine disorders or other disease that would interfere with assessment of drug safety.

11. Aspartate aminotransferase (AST) or alanine aminotransferase (ALT) >2 × the upper limit of normal (ULN), total bilirubin >1.5 × ULN, and/or International Normalized Ratio (INR) >1.5.

    • If participant has a documented history of Gilbert's syndrome, criterion of total bilirubin >1.5 x ULN is not applicable.

    • If participant is taking anticoagulants (e.g., warfarin), and has no known liver issues, INR >3.

12. Known human immunodeficiency virus, hepatitis B, or active hepatitis C virus infection.

13. Participated in a study of an investigational drug less than 6 weeks or 5 half-lives of an investigational drug, whichever is longer, before enrollment in this study.

14. Male with female partner(s) of childbearing potential, unwilling or unable to adhere to contraception requirements specified in the protocol.

15. Female of childbearing potential (see Section 5.10), with a positive pregnancy test result during Screening and are unwilling or unable to adhere to contraception requirements specified in the protocol.

16. Weight less than 50 kg at Screening.

    The following additional exclusion criteria applies for participants undergoing 18F-FDG PET-CT:

17. Blood glucose levels >200 mg/dL.

18. Contraindications to having a PET scan.

Note: Other protocol defined Inclusion/Exclusion Criteria may apply.

Eligibility last updated 07/02//2025. Questions regarding updates should be directed to the study team contact.