This study is designed to assess the usefulness of flortaucipir in Positron Emission Tomography (PET) imaging for subjects diagnosed with Frontotemporal Dementia (FTD).

Inclusion Criteria:

• Subjects diagnosed by a dementia specialist with symptomatic clinical syndromes with expected Frontotemporal Dementia (FTD) pathology will be enrolled. Clinical syndromes associated with FTD pathology include: behavioral-variant FTD, FTD with motor-neuron disease, non-fluent/agrammatic and semantic variants of primary progressive aphasia, progressive supranuclear palsy syndrome and corticobasal syndrome.
• Have provided informed consent or have a legally authorized (LAR) provide consent for study procedures
• Have had volumetric brain MRI obtained in site's companion protocol within one year of enrollment
• Can tolerate PET scan procedures

Exclusion Criteria:

• Have clinically significant cardiac, hepatic, renal, pulmonary, metabolic, or endocrine disturbances that pose potential safety risk
• Have history of risk factors for Torsades de Pointes (TdP) or taking medication known to cause QT prolongation
• Have history of drug or alcohol dependence within the last year
• Are females of childbearing potential who are not surgically sterile, not refraining from sexual activity, or not using reliable contraception
• Have history of relevant severe drug allergy or hypersensitivity
• Have received an investigational medication under FDA IND protocol within 30 days of planned imaging session
• Have received a radiopharmaceutical for imaging/therapy within 24 hours of imaging session
• Possess PET scan evidence of amyloid deposition
• Determined by the investigator to be unsuitable for this type of study

All subjects receiving one dose of flortaucipir in the study

AEs were collected at scan visit and for 48 hours after flortaucipir administration.

Adverse Events were defined as occurring or worsening after injection of dose, within 48 hours post injection, at an imaging visit. AEs occurring after study drug administration, but outside that window were not recorded, unless considered attributable to study drug.