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Efficacy and safety of tau-aggregation inhibitor therapy in patients with mild or moderate Alzheimer's disease: a randomised, controlled, double-blind, parallel-arm, phase 3 trial
Open accessAbstract
Background Leuco-methylthioninium bis(hydromethanesulfonate; LMTM), a stable reduced form of the methylthioninium moiety, acts as a selective inhibitor of tau protein aggregation both in vitro and in transgenic mouse models. Methylthioninium chloride has previously shown potential efficacy as monotherapy in patients with Alzheimer's disease. We aimed to determine whether LMTM was safe and effective in modifying disease progression in patients with mild to moderate Alzheimer's disease.Methods We did a 15-month, randomised, controlled double-blind, parallel-group trial at 115 academic centres and private research clinics in 16 countries in Europe, North America, Asia, and Russia with patients younger than 90 years with mild to moderate Alzheimer's disease. Patients concomitantly using other medicines for Alzheimer's disease were permitted to be included because we considered it infeasible not to allow their inclusion; however, patients using medicines carrying warnings of methaemoglobinaemia were excluded because the oxidised form of methylthioninium in high doses has been shown to induce this condition. We randomly assigned participants (3:3:4) to 75 mg LMTM twice a day, 125 mg LMTM twice a day, or control (4 mg LMTM twice a day to maintain blinding with respect to urine or faecal discolouration) administered as oral tablets. We did the randomisation with an interactive web response system using 600 blocks of length ten, and stratified patients by severity of disease, global region, whether they were concomitantly using Alzheimer's disease-labelled medications, and site PET capability. Participants, their study partners (generally carers), and all assessors were masked to treatment assignment throughout the study. The coprimary outcomes were progression on the Alzheimer's Disease Assessment Scale-Cognitive Subscale (ADAS-Cog) and the Alzheimer's Disease Co-operative Study-Activities of Daily Living Inventory (ADCS-ADL) scales from baseline assessed at week 65 in the modified intention-to-treat population. This trial is registered with Clinicaltrials.gov (NCT01689246) and the European Union Clinical Trials Registry (2012-002866-11).Findings Between Jan 29, 2013, and June 26, 2014, we recruited and randomly assigned 891 participants to treatment (357 to control, 268 to 75 mg LMTM twice a day, and 266 to 125 mg LMTM twice a day). The prespecified primary analyses did not show any treatment benefit at either of the doses tested for the coprimary outcomes (change in ADAS-Cog score compared with control [n=354, 6·32, 95% CI 5·31-7·34]: 75 mg LMTM twice a day [n=257] -0·02, -1·60 to 1·56, p=0·9834, 125 mg LMTM twice a day [n=250] -0·43, -2·06 to 1·20, p=0·9323; change in ADCS-ADL score compared with control [-8·22, 95% CI -9·63 to -6·82]: 75 mg LMTM twice a day -0·93, -3·12 to 1·26, p=0·8659; 125 mg LMTM twice a day -0·34, -2·61 to 1·93, p=0·9479). Gastrointestinal and urinary effects were the most common adverse events with both high doses of LMTM, and the most common causes for discontinuation. Non-clinically significant dose-dependent reductions in haemoglobin concentrations were the most common laboratory abnormality. Amyloid-related imaging abnormalities were noted in less than 1% (8/885) of participants.Interpretation The primary analysis for this study was negative, and the results do not suggest benefit of LMTM as an add-on treatment for patients with mild to moderate Alzheimer's disease. Findings from a recently completed 18-month trial of patients with mild Alzheimer's disease will be reported soon.Funding TauRx Therapeutics.
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“Two earlier studies (NCT01689233 and NCT01689246) conducted on participants with mild AD and mild to moderate AD, respectively, indicated that the drug demonstrated good safety and potential benefits as a monotherapy.466,467”
From Recent advances in Alzheimer's disease: Mechanisms, clinical trials and new drug development strategies. (2024) · cites this paper as [467]
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“Clinical trials of methylene blue-derived tau inhibitors in AD have generally yielded disappointing results [47–49].”
From Systems-based proteomics to resolve the biology of Alzheimer’s disease beyond amyloid and tau (2021) · cites this paper as [47]
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“Unfortunately, in two different phase 3 trials testing LMTM in all-cause dementia and mild-to-moderate AD, there was no reduction in rate of decline of cognition or ADL compared to placebo (Gauthier et al., 2016).”
From Alzheimer Disease: An Update on Pathobiology and Treatment Strategies (2019) · cites this paper as Gauthier et al., 2016
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“Whether LMTM at the doses administered prevented accumulation of aggregated tau or decreased existing deposits was not tested.”
From Alzheimer Disease: An Update on Pathobiology and Treatment Strategies (2019) · cites this paper as Gauthier et al., 2016
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“Finally, the brainstem is affected in PSP-RS and PSP-PGF. clinical benefit in AD patients (Gauthier et al., 2016).”
BackgroundTau Protein-Targeted Therapies in Alzheimer’s Disease: Current State and Future Perspectives
Pluta, R. M., & Ułamek-Kozioł, M. (2020) · Exon Publications eBooks · doi:10.36255/exonpublications.alzheimersdisease.2020.ch4 · Cited by 27
“The primary analysis using leuco-methylthioninium bis derivative of methylthioninium chloride in the treatment of Alzheimer’s disease was negative and the results did not suggest therapeutic benefits for Alzheimer’s disease (39).”
MethodShen, Z. J., Fu, Y. B., Hou, J. L., Lin, L. N., Wang, X. Y., Li, C., & Yang, Y. (2022) · Chinese Medicine · doi:10.1186/s13020-022-00698-1 · Cited by 27
“In addition, the clinical trial of leuco-methylthioninium (LMTM) and methylthioninium (MT), Tau aggregation inhibitors designed to target Tau protein, showed no significant improvement in AD [26, 27].”
Alzheimer's disease and other dementias: update on research
Schneider, L. S. (2016) · The Lancet Neurology · doi:10.1016/s1474-4422(16)30356-8 · Cited by 25
Self-citation“Tau immunotherapy: Hopes and hindrances”
Shahpasand, K., Shamloo, A. S., Nabavi, S. M., Lu, K. P., & Zhou, X. Z. (2017) · Human Vaccines & Immunotherapeutics · doi:10.1080/21645515.2017.1393594 · Cited by 25
“was the only one to specifically assess AD treatment, and the results of this trial were negative, indicating that the use of TRx0237 small molecules in tau target therapy to treat subjects with mild-to-moderate AD was not beneficial.(42)”
ResultBoyton, I., Valenzuela, S. M., Collins‐Praino, L. E., & Care, A. (2023) · Brain Behavior and Immunity · doi:10.1016/j.bbi.2023.11.004 · Cited by 23
Gabr, M. T., & Peccati, F. (2020) · ACS Chemical Neuroscience · doi:10.1021/acschemneuro.0c00281 · Cited by 24
Zhang, X., Lin, L., Li, H., Xia, W., Liu, Q., Zhou, X., Lin, D., & Fu, X. (2022) · International Journal of Biological Macromolecules · doi:10.1016/j.ijbiomac.2022.07.158 · Cited by 25
Chen, J., Li, Q., Liu, J.-S., Jiang, G., Liu, J., Chen, S., & Cheng, Q. H. (2019) · Progress in Neuro-Psychopharmacology and Biological Psychiatry · doi:10.1016/j.pnpbp.2019.01.009 · Cited by 24
“By far, nearly all on-going clinical trials only recruit patients with mild AD and/or mild cognitive impairment (MCI) (Gauthier et al., 2016; Stockburger et al., 2018).”
Chandupatla, R., Flatley, A., Feederle, R., Mandelkow, E., & Kaniyappan, S. (2020) · Alzheimer s & Dementia Translational Research & Clinical Interventions · doi:10.1002/trc2.12097 · Cited by 23
Alrouji, M., Alshammari, M. S., Syed, T., & Shamsi, A. (2025) · Antioxidants · doi:10.3390/antiox14070774 · Cited by 21
“The effectiveness of LMTM has been evaluated in AD patients; nevertheless, the compound failed phase III clinical trials [185,186], indicating the need for more research on tau aggregation mechanisms.”
Venkatramani, A., Mukherjee, S., Kumari, A. R., & Panda, D. (2022) · International Journal of Biological Macromolecules · doi:10.1016/j.ijbiomac.2022.01.172 · Cited by 22
Wei, Y.-D., Chen, X.-X., Yang, L., Gao, X., Xia, Q., Qi, C., & Ge, J. (2022) · Neurochemistry International · doi:10.1016/j.neuint.2022.105385 · Cited by 23
Rostgaard, N., Jul, P., Garmer, M., & Volbracht, C. (2023) · Journal of Integrative Neuroscience · doi:10.31083/j.jin2205135 · Cited by 21
Shoeibi, A., Olfati, N., & Litvan, I. (2018) · Expert Opinion on Investigational Drugs · doi:10.1080/13543784.2018.1460356 · Cited by 23
Yeboah, F., Kim, T., Bill, A., & Dettmer, U. (2019) · Neurobiology of Disease · doi:10.1016/j.nbd.2019.104543 · Cited by 22
Elucidating Critical Proteinopathic Mechanisms and Potential Drug Targets in Neurodegeneration
Dar, K. B., Bhat, A. H., Amin, S., Reshi, B. A., Zargar, M. A., Masood, A., & Ganie, S. A. (2019) · Cellular and Molecular Neurobiology · doi:10.1007/s10571-019-00741-0 · Cited by 23
Recognizing and treating atypical Parkinson disorders
Armstrong, M. J., & McFarland, N. R. (2019) · Handbook of clinical neurology · doi:10.1016/b978-0-12-804766-8.00016-9 · Cited by 24
Wang, Z., Zou, Z., & Li, Q. (2022) · Annals of Translational Medicine · doi:10.21037/atm-22-1148 · Cited by 21
Hyperphosphorylated Tau Inflicts Intracellular Stress Responses that Are Mitigated by Apomorphine
Song, Z., Wang, K., Hagar, H. C., Chen, H., Kuan, C.-Y., Zhang, K., & Kuo, M. (2023) · Molecular Neurobiology · doi:10.1007/s12035-023-03689-x · Cited by 23
“Many natural compounds reportedly reduced AD markers including Aβ and neurofibrillary tangles in animals [43–46].”
Wang, Z., Xiong, L., Wan, W., Duan, L., Bai, X., & Zu, H. (2017) · Frontiers in Molecular Neuroscience · doi:10.3389/fnmol.2017.00032 · Cited by 22
“Very recently, tau aggregation inhibitors also showed no substantial effects against memory decline in AD patients (Gauthier et al., 2016).”
BackgroundAn evaluation of hydromethylthionine as a treatment option for Alzheimer’s disease
Hashweh, N., Bartochowski, Z., Khoury, R., & Grossberg, G. T. (2020) · Expert Opinion on Pharmacotherapy · doi:10.1080/14656566.2020.1719066 · Cited by 22
“Drug name Hydromethylthionine (leuco- methylthioninium bis (hydro- methanesulfonate); LMT) Phase Phase III Indication Alzheimer’s Disease Pharmacology description Tau aggregation inhibitor Route of administration Oral Chemical structure Pivotal trial(s) NCT01626391, Gauthier et al., 2016 [41]; Wilcock et al., 2018 [42…”
BackgroundHuman Brain Neuropharmacology: A Platform for Translational Neuroscience
Dragunow, M. (2020) · Trends in Pharmacological Sciences · doi:10.1016/j.tips.2020.09.002 · Cited by 23
Neuronal Vulnerability of the Entorhinal Cortex to Tau Pathology in Alzheimer’s Disease
Zhang, S., Crossley, C. A., & Yuan, Q. (2024) · British Journal of Biomedical Science · doi:10.3389/bjbs.2024.13169 · Cited by 26
Suppressing Tau Aggregation and Toxicity by an Anti-Aggregant Tau Fragment
Pir, G. J., Choudhary, B. C., Kaniyappan, S., Chandupatla, R., Mandelkow�, E., Mandelkow, E., & Wang, Y. (2018) · Molecular Neurobiology · doi:10.1007/s12035-018-1326-z · Cited by 20
Li, G., Zeng, L., Cheng, H., Han, J., Zhang, X., & Xie, H. (2019) · Medical Science Monitor · doi:10.12659/msm.913858 · Cited by 20
“There are 2 main approved strategies for AD, including N-methyl-D-aspartate receptor antagonist memantine and the acetylcholinesterase inhibitors, however, both of which cannot affect the potential pathological processes and only target symptoms [5].”
Ahmed, R. M., Hodges, J. R., & Piguet, O. (2021) · Advances in experimental medicine and biology · doi:10.1007/978-3-030-51140-1_1 · Cited by 25
Tang, M.-Y., Gorin, F. A., & Lein, P. J. (2022) · Ageing and Neurodegenerative Diseases · doi:10.20517/and.2022.05 · Cited by 20
Li, C., Cui, K., Zhu, X., Wang, S., Yang, Q., & Fang, G. (2024) · Frontiers in Neuroscience · doi:10.3389/fnins.2024.1453582 · Cited by 22
Targeting tau protein in Alzheimer's disease
Rafii, M. S. (2016) · The Lancet · doi:10.1016/s0140-6736(16)32107-9 · Cited by 20
Disease-modifying therapies for tauopathies: agents in the pipeline
Panza, F., Imbimbo, B. P., Lozupone, M., Greco, A., Seripa, D., Logroscino, G., Daniele, A., & Colosimo, C. (2019) · Expert Review of Neurotherapeutics · doi:10.1080/14737175.2019.1606715 · Cited by 20
“Two 15- and 18-month Phase III RCTs of LMTM in patients with mild-to-moderate AD were negative [94].”
BackgroundSetbacks in Alzheimer research demand new strategies, not surrender
Jobke, B., McBride, T. C., Nevin, L. M., Peiperl, L., Ross, A. J., Stone, C., Turner, R. C., & Editors, A. T. P. M. (2018) · PLoS Medicine · doi:10.1371/journal.pmed.1002518 · Cited by 20
Targeting tau in Alzheimer’s and beyond: Insights into pathology and therapeutic strategies
Singh, S., Khan, S., Shahid, M., Sardar, M., Hassan, M. I., & Islam, A. (2024) · Ageing Research Reviews · doi:10.1016/j.arr.2024.102639 · Cited by 19
Aquino, C. (2021) · Frontiers in Neurology · doi:10.3389/fneur.2021.694329 · Cited by 20
“Considering the frustrating results with Aβ targeting therapies, therapeutic development in AD geared to anti-tau drugs, however, with no positive results to date (36).”
BackgroundProtein aggregation and neurodegenerative disease: Structural outlook for the novel therapeutics
Arar, S. H., Haque, M. A., & Kayed, R. (2023) · Proteins Structure Function and Bioinformatics · doi:10.1002/prot.26561 · Cited by 20
“47,251,252 Conclusively in this direction many preclinical studies were reported to explore many synthetic and natural products including polyphenol compounds such as, curcumin and its soluble bioavailable derivatives and analogs.”
Targets, trials and tribulations in Alzheimer therapeutics
Gharat, R., Dixit, G., Khambete, M., & Prabhu, A. (2023) · European Journal of Pharmacology · doi:10.1016/j.ejphar.2023.176230 · Cited by 18
Lajarín-Cuesta, R., Arribas, R. L., Nanclares, C., García‐Frutos, E. M., Gandı́a, L., & Rı́os, C. D. L. (2018) · European Journal of Medicinal Chemistry · doi:10.1016/j.ejmech.2018.07.030 · Cited by 19
Fang, G., Shi, B., Wu, K., Chen, S., Gao, X., Xiao, S., Kang, J. X., Li, W., & Huang, R. (2018) · International Journal of Neuroscience · doi:10.1080/00207454.2018.1533824 · Cited by 19
“achieved good results in phase III clinical trials [16,17].”
Background
Metadata
- Authors
- Gauthier, S., Feldman, H. H., Schneider, L. S., Wilcock, G. K., Frisoni, G. B., Hardlund, J. H., Moebius, H. J., Bentham, P., Kook, K. A., Wischik, D. J., Schelter, B. O., Davis, C. S., Staff, R. T., Bracoud, L., Shamsi, K., Storey, J. M. D., Harrington, C. R., & Wischik, C. M.
- Affiliations
- Douglas Mental Health University Institute (CA)
- University of California San Diego (US)
- University of Southern California (US)
- University of Oxford (GB)
- University of Geneva (CH)
- TauRx (United Kingdom) (GB)
- University of Aberdeen (GB)
- Corresponding author
- Wischik, Claude M
- ORCID
- Venue
- The Lancet
- Publisher
- Elsevier BV
- Published
- 2016-12
- Volume
- 388
- Issue
- 10062
- Pages
- 2873-2884
- ISSN
- 0099-5355 (ISSN-L)
- 0140-6736
- PMC
- PMC5164296
- OpenAlex
- W2553774099
- Cited by
- 427
- References
- 31
- Citations by year
- 2026: 25 · 2025: 46 · 2024: 47 · 2023: 41 · 2022: 47 · 2021: 46 · 2020: 48 · 2019: 47 · 2018: 48 · 2017: 27 · 2016: 4
- FWCI
- 33.77
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- The Lancet (publishedVersion)
- PubMed (publishedVersion)
- Archive ouverte UNIGE (University of Geneva) (publishedVersion)
- PubMed Central (acceptedVersion)
- Aberdeen University Research Archive (Aberdeen University) (submittedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Archive ouverte UNIGE (University of Geneva) (submittedVersion, cc-by)
- Funders
- TauRx Pharmaceuticals
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Alzheimer's disease research and treatments
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Health Sciences › Medicine › Pharmacology (medical) › Cholinesterase and Neurodegenerative Diseases
- Keywords
- Alzheimer's disease, tau aggregation, methylene blue, disease progression, ADAS-Cog, cognitive decline, activities of daily living, methemoglobinemia, drug safety, mild to moderate Alzheimer's disease, amyloid PET, FDG-PET
- MeSH terms
- Activities of Daily Living, Aged, Aged, 80 and over, Alzheimer Disease, Animals, Brain, Dose-Response Relationship, Drug, Double-Blind Method, Female, Humans, Male, Middle Aged, Psychiatric Status Rating Scales, tau Proteins, Treatment Failure, Mice
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