Radiosynthesis, <i>In Vitro</i> Characterization, and <i>In Vivo</i> PET Neuroimaging of [<sup>18</sup>F]F-4 for Tau Protein: A First-in-Human PET Study
Bibliographic record
Abstract
High Resolution Image Download MS PowerPoint Slide [ 18 F]PI-2620 is a promising radiopharmaceutical for positron emission tomography (PET) imaging of both Alzheimer’s disease (AD) and non-Alzheimer’s disease (non-AD) tauopathies in humans. An array of fluorinated derivatives of the carbazole scaffold of PI-2620 were synthesized and evaluated. In vitro binding assays with [ 3 H]PI-2620 in human tissues with AD, progressive supranuclear palsy, and corticobasal degeneration, combined with in silico predictions of blood–brain barrier permeability, led to the selection and radiosynthesis of [ 18 F]F-4 as a promising radiotracer. In vivo PET imaging with [ 18 F]F-4 in healthy rats showed brain uptake and kinetics suitable for neuroimaging, similar to those of [ 18 F]PI-2620. A first-in-human PET imaging study in a healthy subject as well as a patient with AD, in comparison with [ 18 F]PI-2620 in the same AD subject, confirmed that [ 18 F]F-4 is an alternative radiopharmaceutical for imaging tau protein.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".