Anti-Tau Therapeutics

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Anti-Tau Therapeutics

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Anti-Tau Therapeutics

Introduction

Anti Tau Therapeutics is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox">
<table>
<tr><th colspan="2" style="background:#f0f0f0;">Anti-Tau Therapeutics</th></tr>
<tr><td><b>Category</b></td><td>Disease-Modifying Therapy</td></tr>
<tr><td><b>Target Diseases</b></td><td>Alzheimer's Disease, Progressive Supranuclear Palsy, Corticobasal Degeneration, Primary Tauopathies</td></tr>
<tr><td><b>Mechanism</b></td><td>Reduce tau phosphorylation, aggregation, and propagation</td></tr>
<tr><td><b>Approaches</b></td><td>Kinase inhibitors, aggregation inhibitors, immunotherapy, microtubule stabilizers</td></tr>
</table>
</div>

Overview

...

Anti-Tau Therapeutics

Introduction

Anti Tau Therapeutics is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox">
<table>
<tr><th colspan="2" style="background:#f0f0f0;">Anti-Tau Therapeutics</th></tr>
<tr><td><b>Category</b></td><td>Disease-Modifying Therapy</td></tr>
<tr><td><b>Target Diseases</b></td><td>Alzheimer's Disease, Progressive Supranuclear Palsy, Corticobasal Degeneration, Primary Tauopathies</td></tr>
<tr><td><b>Mechanism</b></td><td>Reduce tau phosphorylation, aggregation, and propagation</td></tr>
<tr><td><b>Approaches</b></td><td>Kinase inhibitors, aggregation inhibitors, immunotherapy, microtubule stabilizers</td></tr>
</table>
</div>

Overview

Mermaid diagram (expand to render)

Anti-tau therapeutics aim to modify the course of tauopathies by targeting the pathological accumulation and spread of hyperphosphorylated tau protein. Tau normally stabilizes microtubules, but in disease states it becomes hyperphosphorylated, dissociates from microtubules, aggregates into neurofibrillary tangles (NFTs), and spreads between neurons in a prion-like manner. These therapies represent the most advanced disease-modifying approaches for Alzheimer's disease and primary tauopathies["@wang2016"].

Tau Biology and Therapeutic Targets

Tau isoforms and post-translational modifications

Six isoforms: Generated by alternative splicing of MAPT gene
3R vs 4R tau: Primary tauopathies characterized by isoform ratios
PTMs: Phosphorylation (60+ sites), acetylation, truncation, ubiquitination

Therapeutic target nodes

Kinases: Reduce tau phosphorylation

Phosphatases: Enhance dephosphorylation

Aggregation inhibitors: Prevent fibril formation

Immunotherapy: Clear existing tau pathology

Microtubule stabilizers: Preserve neuronal function

Kinase Inhibitors

Glycogen Synthase Kinase-3 (GSK-3β)

GSK-3β is the primary kinase responsible for pathological tau phosphorylation.

Lithium: First-generation inhibitor, modest efficacy in clinical trials[@forlenza2019]
Tideglusib: Selective GSK-3β inhibitor, failed in PSP Phase II[@tolosa2014]
AZD1089: Advanced GSK-3 inhibitor, discontinued due to toxicity

Cyclin-Dependent Kinase-5 (CDK5)

Critical for normal tau phosphorylation; hyperactivation contributes to pathology.

Roscovitine: CDK2/5/7 inhibitor, limited brain penetration
CYC202 (Seliciclib): Broad CDK inhibitor, in clinical trials

Other kinases

DKK1 inhibitors: Block Wnt pathway activation
JNK inhibitors: Target stress-activated kinase pathway
CK1δ/ε inhibitors: Casein kinase inhibitors

Aggregation Inhibitors

Small Molecule Inhibitors

Methylene Blue derivatives: First-generation aggregation inhibitors, mixed clinical results[@wischik2015]
Phenylthiazolyl-hydrazide compounds: Inhibit tau fibrillization
NPT200-1: Calcium/calmodulin-dependent protein kinase inhibitor

Microtubule Stabilizers

Tau loss-of-function leads to microtubule destabilization.

Paclitaxel: Poor BBB penetration limits use
Epothilone D: Blood-brain barrier penetrant, failed in Phase I[@zhang2012]
Davunetide (AL-108): Nasal peptide, positive in Phase II for MCI[@muresanu2016]

Immunotherapy

Active Immunization

AADvac1 (Axon Neuroscience)

Tau peptide vaccine targeting phosphorylated tau
Phase I: Generated robust antibody response[@novak2017]
Phase II ADAMANT: Did not meet primary endpoint in AD[@novak2023]

ACI-35 (AC Immune)

Liposome-based vaccine targeting phosphorylated Ser396/404
Strong immune response in Phase Ib[@theunis2013]

Passive Immunization

Lecanemab (BAN2401) (Eisai/Biogen)

Anti-amyloid antibody with anti-tau activity
Phase III CLARITY-AD: Slowed cognitive decline, reduced tau spread[@van2023]
FDA approved for early AD

Donanemab (LY3002813) (Eli Lilly)

N-terminal tau antibody
Phase III TRAILBLAZER-ALZ 2: Slowed cognitive decline[@sims2023]
FDA approved for early AD

Anti-tau antibodies in development:

Gantenerumab (Roche): Bivalent antibody, failed in Phase III
Semorinemab (Roche): Failed in Phase II AD
Tilavonemab (AbbVie): Failed in PSP

Clinical Trial Landscape

Comprehensive Anti-Tau Drug Ranking Table

| Rank | Drug | Company | Mechanism | Target Epitope | Phase | NCT ID | Key Results | IgG Subclass | Status |
|------|------|---------|-----------|----------------|-------|--------|-------------|--------------|--------|
| 1 | Etalanetug (E2814) | Eisai | Anti-tau mAb | MTBR (p-tau396/404) | Phase III | NCT05355493 | MTBR-tau-243 ↓30-70%, pTau217 ↓50% | IgG1 | Active |
| 2 | BIIB080 (MAPTRx) | Biogen/Ionis | ASO | MAPT mRNA | Phase II | NCT05399888 | 50-60% CSF tau reduction | N/A | Active |
| 3 | Bepranemab | UCB | Anti-tau mAb | aa 235-250 (MTBR) | Phase II | NCT05462106 | 58% tau-PET reduction, subgroup benefit | IgG4 | Active |
| 4 | JNJ-63733657 | Janssen | Anti-tau mAb | p-tau217 | Phase II | NCT04619420 | CSF p-tau217 reduction | IgG1 | Active |
| 5 | LY3372689 (Oglemilide) | Eli Lilly | OGA Inhibitor | O-GlcNAcylation | Phase II | NCT05063552 | Target engagement demonstrated | N/A | Active |
| 6 | PRX005 | Prothena/BMS | Anti-tau mAb | MTBR | Phase I | NCT05394125 | Ongoing | IgG1 | Active |
| 7 | Posdinemab (BMS-986446) | BMS | Anti-tau mAb | Mid-domain | Phase II | NCT05514899 | Ongoing | IgG1 | Active |
| 8 | MK-2214 | Merck | Anti-tau mAb | p-tau413 | Phase I | NCT05828832 | Ongoing | IgG1 | Active |
| 9 | Semorinemab | Roche | Anti-tau mAb | N-terminus | Phase II | NCT04382253 | TAURIEL failed, LAURIET mixed | IgG4 | Active |
| 10 | LU-AF87908 | Lundbeck | Anti-tau mAb | p-tau396/404 | Phase I | NCT06310149 | Phase I ongoing | IgG1 | Active |
| 11 | APNMAB005 | Alector | Anti-tau mAb | Synaptic oligomeric tau | Phase I | NCT05693922 | First-in-human ongoing | IgG1 | Active |
| 12 | NIO752 | Roche | ASO | MAPT mRNA | Phase I | NCT05838953 | Dose-escalation ongoing | N/A | Active |
| 13 | ASN90 | Asceneuron | OGA Inhibitor | O-GlcNAcylation | Phase I/II | NCT05239017 | Phase I complete, Phase II planned | N/A | Active |
| 14 | AADvac1 | Axon Neuroscience | Vaccine | p-tau | Phase II | NCT02579252 | Did not meet primary endpoint | N/A | Active |
| 15 | ACI-35 | AC Immune | Vaccine | p-tau396/404 | Phase Ib/IIa | NCT04445831 | Strong immune response | N/A | Active |
| 16 | LMTX (HMTM) | TauRx | Aggregation Inhibitor | Tau aggregates | Phase III | NCT03446001 | Controversial, not approved | N/A | Discontinued |
| 17 | Gosuranemab | Biogen | Anti-tau mAb | N-terminal | Phase II | NCT02460094 | Failed: no clinical benefit | IgG1 | Discontinued |
| 18 | Tilavonemab | AbbVie | Anti-tau mAb | N-terminal | Phase II | NCT02880991 | Failed in PSP | IgG1 | Discontinued |
| 19 | Zagotenemab | Eli Lilly | Anti-tau mAb | MC1 epitope | Phase II | NCT03518028 | Failed: no clinical benefit | IgG1 | Discontinued |

Mechanism Clustering

Tau Immunotherapy (Passive Antibodies)

MTBR-Targeting (Showing Promise):

[Etalanetug (E2814)](/therapeutics/etalanetug-e2814) — Eisai, IgG1, p-tau396/404, Phase III
[Bepranemab](/therapeutics/bepranemab) — UCB, IgG4, aa 235-250, Phase II
[PRX005](/therapeutics/prx005) — Prothena/BMS, IgG1, MTBR, Phase I

p-tau217 Targeting:

[JNJ-63733657](/therapeutics/jnj-63733657) — Janssen, IgG1, Phase II

Mid-Domain Targeting:

[Posdinemab (BMS-986446)](/therapeutics/posdinemab) — BMS, IgG1, Phase II

p-tau413 Targeting:

[MK-2214](/therapeutics/mk-2214) — Merck, IgG1, Phase I

p-tau396/404 Targeting:

[LU-AF87908](/therapeutics/lu-af87908) — Lundbeck, IgG1, Phase I

Synaptic Oligomeric Tau:

[APNMAB005](/therapeutics/apnmab005) — Alector, IgG1, Phase I

N-Terminal Targeting (FAILED):

[Semorinemab](/therapeutics/semorinemab) — Roche, IgG4, Phase II (mixed results)
[Gosuranemab](/therapeutics/gosuranemab) — Biogen, IgG1, Phase II (discontinued)
[Tilavonemab](/therapeutics/tilavonemab) — AbbVie, IgG1, Phase II (discontinued)
[Zagotenemab](/therapeutics/zagotenemab) — Eli Lilly, IgG1, Phase II (discontinued)

Tau Gene Therapy (ASOs)

[BIIB080 (MAPTRx)](/therapeutics/biib080-maptrx) — Biogen/Ionis, MAPT mRNA knockdown, Phase II
[NIO752](/therapeutics/nio752) — Roche, MAPT mRNA knockdown, Phase I

Tau Small Molecules

[LY3372689 (Oglemilide)](/therapeutics/ly3372689) — Eli Lilly, OGA inhibition, Phase II
[ASN90](/therapeutics/asn90) — Asceneuron, OGA inhibition, Phase I/II
[LMTX/HMTM](/therapeutics/lmtx-trx0237) — TauRx, aggregation inhibitor, Phase III (discontinued)

Tau Vaccines (Active Immunization)

[AADvac1](/therapeutics/aadvac1) — Axon Neuroscience, p-tau, Phase II
[ACI-35](/therapeutics/aci-35-liposomal-vaccine) — AC Immune, p-tau396/404, Phase Ib/IIa

Key Insights

N-terminal antibodies FAILED: Gosuranemab, Tilavonemab, Semorinemab (failed or mixed)

MTBR-targeting showing promise: E2814, Bepranemab, PRX005

IgG1 > IgG4: TRIM21-mediated intracellular clearance favors IgG1

ASO approach validated: BIIB080 showing dose-dependent tau reduction

OGA inhibitors emerging: LY3372689 represents novel small-molecule approach

Approved/Late-Stage Anti-Tau Approaches

| Drug | Company | Mechanism | Phase | Indication |
|------|---------|-----------|-------|------------|
| Lecanemab | Eisai/Biogen | mAb (Aβ/tau) | III/Approved | Early AD |
| Donanemab | Eli Lilly | mAb (N-tau) | III/Approved | Early AD |
| AADvac1 | Axon | Vaccine | II | AD/PSP |

Detailed Clinical Trial Evidence: E2814, BIIB080, and Bepranemab

This section provides comprehensive clinical trial data for the three lead anti-tau therapeutics: E2814, BIIB080, and bepranemab.

Etalanetug (E2814) — Phase III

DIAN-TU Study (NCT05355493)

| Parameter | Details |
|-----------|---------|
| Sponsor | Eisai |
| Phase | Phase III |
| Population | Autosomal dominant AD (PSEN1, PSEN2, APP mutations) |
| Enrollment | ~200 participants |
| Design | Randomized, placebo-controlled |
| Primary Endpoints | Cognitive decline (DIAN-MCI), tau PET |
| Key Results | MTBR-tau-243 reduced 30-70%; CSF pTau217 reduced 50% at 2 years |
| Status | Active, enrolling |

⚠️ 4R-Tauopathy Trial (NCT05615614) — DOES NOT EXIST IN CLINICALTRIALS.GOV

| Parameter | Details |
|-----------|---------|
| NCT ID | NCT05615614 — DOES NOT EXIST |
| Status | No active 4R-tauopathy (PSP/CBS) trial for E2814 |

Current E2814 trials:

NCT06602258: Phase 2, AD with lecanemab (Active, not recruiting)
NCT04971733: Phase 1/2, AD (Completed)

Phase II Dose-Finding with Lecanemab (NCT06602258)

| Parameter | Details |
|-----------|---------|
| NCT ID | NCT06602258 |
| Population | MCI due to AD (n=105, target 90) |
| Design | E2814 + lecanemab combination |
| Duration | 18 months |
| Sites | 34 sites in U.S. and Japan |
| Primary Endpoint | Change in CSF MTBR-tau-243 at 6 months |
| Expected Completion | August 2027 |

BIIB080 (MAPTRx) — Phase II

Phase I Study (NCT03119818)

| Parameter | Details |
|-----------|---------|
| Population | Healthy volunteers, mild AD |
| Key Results | Dose-dependent CSF tau reduction up to 50-60% |
| Publication | Nature Medicine (2022) |
| Status | Completed |

Phase I/II Study (NCT04784160)

| Parameter | Details |
|-----------|---------|
| Population | Mild Alzheimer's disease |
| Key Results | Sustained dose-dependent CSF tau reductions |
| Publication | JAMA Neurology (2023) |
| Status | Completed |

Phase II Study (NCT05399888)

| Parameter | Details |
|-----------|---------|
| NCT ID | NCT05399888 |
| Population | Early Alzheimer's disease |
| Phase | Phase II |
| Enrollment | ~300 participants |
| Primary Endpoints | Safety, tolerability, cognitive endpoints |
| Secondary Endpoints | CSF tau reduction, tau PET |
| Design | Randomized, placebo-controlled |
| Status | Active/recruiting (2026) |
| Designation | FDA Fast Track |

Bepranemab — Phase II

Phase II Alzheimer's Disease (NCT04867616)

| Parameter | Details |
|-----------|---------|
| NCT ID | NCT04867616 |
| Population | 466 participants with MCI or mild AD dementia |
| Primary Endpoint | CDR-SB change from baseline |
| Status | Completed (primary endpoint not met) |
| Key Results | Primary not met; 58% tau-PET reduction; 33% slower decline in low-tau, non-ApoE4 carriers |
| Safety | No ARIA observed |

Phase I PSP Study

| Parameter | Details |
|-----------|---------|
| Population | 25 PSP patients |
| Duration | December 2019 – November 2021 |
| Status | Completed |
| Results | Safe, no concerns |
| Extension | Open-label extension (n=19, expected March 2027) |

Phase II PSP Trial

| Parameter | Details |
|-----------|---------|
| NCT ID | NCT05318985 |
| Target | pSer208 epitope (abundant in PSP) |
| Status | Active development |
| Rationale | 4R tauopathy with prominent brainstem pathology |

Summary of Key Clinical Trial Endpoints

| Drug | Phase | NCT ID | Primary Endpoint | Key Efficacy Finding |
|------|-------|--------|-------------------|---------------------|
| E2814 | III | NCT05355493 | Cognitive, tau PET | MTBR-tau-243 ↓30-70%, pTau217 ↓50% |
| BIIB080 | II | NCT05399888 | Safety, CSF tau | 50-60% CSF tau reduction |
| Bepranemab | II | NCT04867616 | CDR-SB | Not met; 58% tau-PET reduction |

Biomarkers for Anti-Tau Trials

Tau PET Imaging

[^18F]Flortaucipir (AV-1451): FDA-approved tau PET ligand[@xia2017]
[^18F]MK-6240: Next-generation tau PET tracer
Correlates with clinical severity and progression

CSF Biomarkers

Total tau (t-tau): Marker of neuronal damage
Phosphorylated tau (p-tau181, p-tau217): Disease-specific[@zetterberg2019]
Tau RT-QuIC: Seed amplification for detection

Blood-Based Biomarkers

p-tau217: Highly specific for AD, correlates with PET[@palmqvist2020]
p-tau181: Emerging clinical utility
NfL: Neurodegeneration marker

Primary Tauopathies

Progressive Supranuclear Palsy (PSP)

4R tauopathy with characteristic brainstem pathology
No approved disease-modifying treatments
Anti-tau immunotherapies in clinical trials

Corticobasal Degeneration (CBD)

4R tauopathy with asymmetric cortical involvement
Often responds poorly to standard therapies

Frontotemporal Dementia (FTD-Tau)

Includes Pick's disease (3R) and others
Genetic forms (MAPT mutations) inform therapeutic development

Combination Approaches

Anti-amyloid + anti-tau: Lecanemab's dual mechanism
Kinase inhibitor + immunotherapy: Complementary mechanisms
Symptomatic + disease-modifying: Integrated treatment strategies

Challenges

Tau isoform complexity: Different diseases require different approaches

BBB penetration: Many compounds fail to reach brain

Biomarker validation: Need better surrogate endpoints

Patient selection: Genetic and biomarker stratification needed

Background

The study of Anti Tau Therapeutics has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

External Links

[Alzheimer's Association - Tau Research](https://www.alz.org/research/tau)
[CurePSP - Tauopathies Research](https://www.psp.org/)
[Alzheimer's Drug Discovery Foundation - Tau-Targeting Therapies](https://www.alzdiscovery.org/)

References

[Wang Y, Mandelkow E, Tau in physiology and pathology (2016)](https://pubmed.ncbi.nlm.nih.gov/26631930/))

Forlenza OV, Radanovic M, Talib LL, et al, Lithium and dementia: a systematic review and meta-analysis (2019)

[Tolosa E, Litvan I, Höglinger GU, et al, A Phase II trial of tideglusib in PSP (2014)](https://doi.org/10.1002/mds.25824))

[Wischik CM, Staff RT, Aberg KA, et al, Tau aggregation inhibitor therapy: an exploratory Phase 2 study (2015)](https://doi.org/10.3233/jad-142874))

Zhang B, Carroll J, Trojanowski JQ, et al, The microtubule stabilizer Epothilone D reduces tau-mediated neurodegeneration (2012)

Muresanu V, Buzoianu A, Marschall T, et al, Davunetide for the treatment of mild cognitive impairment (2016)

[Novak P, Schmidt R, Kontsekova E, et al, Safety and immunogenicity of the tau vaccine AADvac1 in patients with Alzheimer's disease: a randomised, double-blind, placebo-controlled, phase 1 trial (2017)](https://pubmed.ncbi.nlm.nih.gov/27955995/))

[Novak P, Kovacech B, Katina S, et al, ADAMANT: a placebo-controlled randomized phase 2 study of AADvac1, an active immunotherapy against pathological tau in Alzheimer's disease (2023)](https://pubmed.ncbi.nlm.nih.gov/37117834/))

[Theunis C, Crespo-Biel N, Gafner V, et al, Efficacy and safety of a liposome-based vaccine against protein Tau, assessed in tau.P301L mice that model tauopathy (2013)](https://pubmed.ncbi.nlm.nih.gov/23977276/))

[van Dyck CH, Swanson CJ, Aisen P, et al, Lecanemab in Early Alzheimer's Disease (2023)](https://pubmed.ncbi.nlm.nih.gov/36449413/))

[Sims JR, Zimmer JA, Evans CD, et al, Donanemab in early Alzheimer's disease (2023)](https://doi.org/10.1001/jama.2023.13239))

Xia CF, Arteaga J, Chen G, et al, \[^18F\]Flortaucipir (AV-1451) binds to tau pathology in AD brain (2017)

Zetterberg H, Tau in cerebrospinal fluid: a classic biomarker with new applications (2019)

[Palmqvist S, Janelidze S, Quiroz YT, et al, Discriminatory accuracy of plasma p-tau217 for Alzheimer disease (2020)](https://doi.org/10.1001/jama.2020.12134))

From the [SciDEX Exchange](/exchange) — scored by multi-agent debate

[Synthetic Biology BBB Endothelial Cell Reprogramming](/hypothesis/h-84808267) — <span style="color:#81c784;font-weight:600">0.71</span> · Target: TFR1, LRP1, CAV1, ABCB1
[Heat Shock Protein 70 Disaggregase Amplification](/hypothesis/h-5dbfd3aa) — <span style="color:#81c784;font-weight:600">0.71</span> · Target: HSPA1A
[PARP1 Inhibition Therapy](/hypothesis/h-69919c49) — <span style="color:#81c784;font-weight:600">0.67</span> · Target: PARP1
[Glymphatic System-Enhanced Antibody Clearance Reversal](/hypothesis/h-62e56eb9) — <span style="color:#81c784;font-weight:600">0.66</span> · Target: AQP4
[Arginine Methylation Enhancement Therapy](/hypothesis/h-19003961) — <span style="color:#81c784;font-weight:600">0.65</span> · Target: PRMT1
[RNA Granule Nucleation Site Modulation](/hypothesis/h-fffd1a74) — <span style="color:#81c784;font-weight:600">0.64</span> · Target: G3BP1
[Glycine-Rich Domain Competitive Inhibition](/hypothesis/h-7e846ceb) — <span style="color:#ffd54f;font-weight:600">0.59</span> · Target: TARDBP
[Dual-Domain Antibodies with Engineered Fc-FcRn Affinity Modulation](/hypothesis/h-23a3cc07) — <span style="color:#ffd54f;font-weight:600">0.58</span> · Target: FCGRT

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📊 Evidence Profile Foundational

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📗 Cite This Artifact

Anti-Tau Therapeutics

Anti-Tau Therapeutics

Introduction

Overview

Anti-Tau Therapeutics

Introduction

Overview

Tau Biology and Therapeutic Targets

Tau isoforms and post-translational modifications

Therapeutic target nodes

Kinase Inhibitors

Glycogen Synthase Kinase-3 (GSK-3β)

Cyclin-Dependent Kinase-5 (CDK5)

Other kinases

Aggregation Inhibitors

Small Molecule Inhibitors

Microtubule Stabilizers

Immunotherapy

Active Immunization

Passive Immunization

Clinical Trial Landscape

Comprehensive Anti-Tau Drug Ranking Table

Mechanism Clustering

Tau Immunotherapy (Passive Antibodies)

Tau Gene Therapy (ASOs)

Tau Small Molecules

Tau Vaccines (Active Immunization)

Key Insights

Approved/Late-Stage Anti-Tau Approaches

Detailed Clinical Trial Evidence: E2814, BIIB080, and Bepranemab

Etalanetug (E2814) — Phase III

BIIB080 (MAPTRx) — Phase II

Bepranemab — Phase II

Summary of Key Clinical Trial Endpoints

Biomarkers for Anti-Tau Trials

Tau PET Imaging

CSF Biomarkers

Blood-Based Biomarkers

Primary Tauopathies

Progressive Supranuclear Palsy (PSP)

Corticobasal Degeneration (CBD)

Frontotemporal Dementia (FTD-Tau)

Combination Approaches

Challenges

Background

See Also

External Links

References

Related Hypotheses

💬 Discussion