semorinemab (RG6100) / AC Immune - LARVOL DELTA

Evaluation of CSF and plasma tau species as fluid surrogate candidates for tau PET in prodromal to moderate Alzheimer's disease. (PubMed, Alzheimers Dement) - "CSF C2N-eMTBR-tau243, MTBR/243-254, p-tau205, and p-tau217 demonstrated comparable strong correlations with tau PET. These findings may guide future development of plasma biomarker surrogates for tau PET."

Biomarker • Journal • Alzheimer's Disease • CNS Disorders • p-tau181

Aβ- and tau-detecting synthetic receptors to build a programmable Alzheimer’s disease therapy (ASGCT 2026) - "Monoclonal antibodies (mAbs) targeting Aβ or tau have been investigated in clinical trials, and several anti-Aβ mAbs (lecanemab, donanemab) have received FDA approval for their ability to clear Aβ...Bapineuzumab was used to construct the Aβ-detecting receptor Bap-Notch; Sem-Notch (semorinemab) detects tau...To this end, we’ve adapted receptor circuits to be compatible with AAV for transduction of endogenous brain cells with native surveillance functions, like astrocytes. The modularity of this platform allows for use with many therapeutic transgenes, including those that are anti-inflammatory, as demonstrated here."

Alzheimer's Disease • CNS Disorders • Gene Therapies • Inflammation • Aβ42 • CSF2 • SERPINA3 • TNFRSF1A

Network meta-analysis of the efficacy of nine drugs for cognitive function in patients with Alzheimer's disease. (PubMed, J Alzheimers Dis Rep) - "We systematically searched randomized controlled trials published up to May 2025 that evaluated aducanumab, lecanemab, donanemab, gosuranemab, semorinemab, tilavonemab, zagotenemab, masupirdine, or sodium oligomannate in AD. Tau-targeted antibodies (semorinemab, tilavonemab) display modest but non-significant promise, whereas aducanumab's apparent benefit is likely confounded by publication bias. Further large, rigorous randomized controlled trials and improved preclinical models are essential."

Journal • Retrospective data • Review • Alzheimer's Disease • CNS Disorders • Cognitive Disorders • Dementia

Biomarkers. (PubMed, Alzheimers Dement) - P2 | "Speech characteristics can be combined into meaningful indices of disease progression across the spectrum of MCI to moderate AD. All three composites performed well overall. The best performing composite was our previously published Tauriel derived biomarker, which had the largest effect size of change, highest test-retest reliability, and was also the most parsimonious measure with the fewest features. These results highlight the potential utility of a speech-based biomarker as an objective and low-burden measure of clinical progression to complement traditional endpoints in AD clinical trials."

Biomarker • Journal • Alzheimer's Disease • CNS Disorders • Dementia

Developing Topics. (PubMed, Alzheimers Dement) - "The minimal differences between treatment and placebo-relative to the wide scoring scales-suggest that targeting amyloid plaques may be insufficient as a disease-modifying approach. These findings underscore the urgent need for alternative strategies. One such approach is NA-831, Biomed's novel small-molecule therapy based on neurogenesis and neuroprotection. Unlike amyloid-targeted antibodies, NA-831 aims to restore neuronal function and cognition by stimulating endogenous brain repair mechanisms. These emerging strategies may better align with the complex pathophysiology of AD and represent a promising new frontier in treatment."

Journal • Review • Alzheimer's Disease • CNS Disorders • Dementia

Formal and informal care utilization in MCI and mild dementia due to AD: Cross-sectional and longitudinal analyses of RUD-Lite data from the Tauriel study. (PubMed, Dement Geriatr Cogn Disord) - P2 | "Longitudinal RUD-Lite changes in interventional early AD studies are detectable but smaller than in observational studies, possibly due to differences in cohort characteristics. These factors, along with subtle regional differences in care utilization, should be considered when using observational data to guide interventional trials."

Journal • Alzheimer's Disease • CNS Disorders • Cognitive Disorders • Dementia

CSF proteomics of semorinemab Alzheimer's disease trials identifies cell-type specific signatures. (PubMed, Brain) - P2 | "The elevation of proteins such as CHI3L1 and GPNMB with treatment suggested an activated glial state. This study demonstrates the utility of CSF clinical proteomics to assess the pharmacodynamic response of semorinemab and contributes to our understanding of how an anti-tau antibody influences disease-relevant pathophysiology in AD."

Clinical • Journal • Alzheimer's Disease • CNS Disorders • CHI3L1 • GPNMB

Comparative the efficacy and safety of Gosuranemab, Semorinemab, Tilavonemab, and Zagotenemab in patients with Alzheimer's disease: a systematic review and network meta-analysis of randomized controlled trials. (PubMed, Front Aging Neurosci) - "Further studies are needed to confirm these findings, assess long-term effects, and refine treatment protocols. https://www.crd.york.ac.uk/prospero/#myprospero, CRD42024583388."

Journal • Retrospective data • Review • Alzheimer's Disease • CNS Disorders • Dementia • Infectious Disease • Nephrology

Developing Topics. (PubMed, Alzheimers Dement) - "The cumulative mean changes for CDR-SB were -0.08; for ADAS-Cog it was -0.53, with both 95%CI including zero. The score range for CDR-SB is 0 to 18; the range for ADAS-Cog is 0 to 70/90. These mean differences across the many trials conducted cannot be considered to be either clinically or statistically significant."

Journal • Review

Biomarkers. (PubMed, Alzheimers Dement) - "Six CSF proteins highly correlated with tau PET were identified. Validation of these results by replicating the analysis on a secondary dataset with PET and CSF protein measurements may establish further confidence in these findings."

Biomarker • Journal • Alzheimer's Disease • CNS Disorders • MAPT • YWHAZ

Developing Topics. (PubMed, Alzheimers Dement) - P2 | "We replicated prior speech biomarker findings in an independent, more severe AD population, suggesting that the speech characteristics within this score are robust and aligned with clinical progression across disease stages. Additional validation work is ongoing, including the development of comparative biomarkers leveraging the combined dataset."

Biomarker • Journal • Alzheimer's Disease • CNS Disorders

Drug Development. (PubMed, Alzheimers Dement) - P2 | "Data from the two semorinemab trials suggest that there may be regional differences in the impact of study partner type on retention. Further studies are needed to assess the generalizability of these findings, with an emphasis on cohorts with more representative samples of non-spousal dyads."

Journal • Alzheimer's Disease • CNS Disorders

Drug Development. (PubMed, Alzheimers Dement) - P2 | "The anchor- and distribution-based approaches suggest that clinically meaningful change on the ADCS-ADL may be greater than the 2 points that has previously been postulated (Dysken et al., 2014). Higher change thresholds may be required to reflect meaningful changes perceptible to caregivers."

Journal • Alzheimer's Disease • CNS Disorders

Synthetic receptors for programmable tau-responsive cellular therapies (Neuroscience 2024) - "Receptors with recognition domains derived from clinical anti-tau mAbs (semorinemab, gosuranemab, bepranemab) were built and expressed in mouse mesenchymal stromal cells (mMSCs) (Fig 1A; synNotch constructs displayed). We envision tau receptors being used in a cell-based therapy, outfitting microglia and astrocytes with novel therapeutic behaviors. In neurons, tau receptors may serve as useful tools for reporting the extent of local tau pathology in real-time."

Alzheimer's Disease • CNS Disorders • Dementia • BDNF

AC Immune reports full-year 2019 financial results and provides 2020 R&D outlook (GlobeNewswire) - "Initiation of a second Phase 2 trial of semorinemab in patients with moderate AD, by our collaboration partner Genentech, a member of the Roche Group. This antibody is also being studied in a separate Phase 2 trial in prodromal to mild AD; Presented initial interim data from an on-going Phase 1b trial of the ACI-24 anti-Abeta vaccine to treat Down syndrome (DS)-related AD...2020 Clinical Readouts: Semorinemab, anti-Tau antibody: Phase 2 trial primary completion (estimated last patient, last visit) in prodromal/mild in Q2; ACI-24 anti-Abeta vaccine in DS: Phase 1b full study reporting in H2; ACI-24 in AD: Phase 2, 12-month interim analysis in H2."

New P2 trial • P1 data • P2 data • Trial primary completion date • Trial status • Alzheimer's Disease • CNS Disorders

Pharmacodynamic effects of semorinemab on plasma and CSF biomarkers of Alzheimer's disease pathophysiology. (PubMed, Alzheimers Dement) - P1, P2 | "AD pathophysiology biomarkers were measured to assess the mechanism of action. Semorinemab increased CSF YKL-40 in participants with AD but not in healthy controls. Semorinemab possibly stabilized plasma GFAP in the Lauriet trial. Semorinemab treatment may activate microglia and moderate reactive gliosis."

Biomarker • Journal • PK/PD data • Alzheimer's Disease • Amyloidosis • CNS Disorders • Inflammation • CHI3L1 • GFAP • p-tau181

CSF complement proteins are elevated in prodromal to moderate Alzheimer's disease patients and are not altered by the anti-tau antibody semorinemab. (PubMed, Alzheimers Dement) - "Cerebrospinal fluid (CSF) complement proteins C4a, C3a, Bb, C4, C3, and factor B levels were increased in Alzheimer's disease (AD) patients compared to a separate cognitively unimpaired (CU) cohort. Baseline CSF complement protein levels were correlated with neuro-axonal degeneration and glial activation biomarkers in AD patients. The investigational anti-tau antibody semorinemab did not impact CSF complement protein levels or activity relative to the placebo arm."

Journal • Alzheimer's Disease • CNS Disorders • Inflammation

Semorinemab Pharmacokinetics and The Effect on Plasma Total Tau Pharmacodynamics in Clinical Studies. (PubMed, J Prev Alzheimers Dis) - "Our target-mediated drug disposition model adequately described the serum pharmacokinetics and the peripheral non-linear increase with dose of the total tau. The model confirmed that these dose-response relationships were consistent across populations of healthy volunteers and subjects with different severities of Alzheimer's disease."

Journal • PK/PD data • Alzheimer's Disease • CNS Disorders • Plasma T-Tau

Robustness and generalizability of a speech-based digital biomarker derived from recordings of the Clinical Dementia Rating (CDR) interview (AAIC 2024) - P2 | " We analyzed CDR interview recordings at screening, baseline, week 25, and week 49 from 81 English-speaking mild-to-moderate AD patients enrolled in the placebo arm of the Lauriet Phase 2 trial of semorinemab (NCT03828747)... We replicated prior speech biomarker findings in an independent, more severe AD population, suggesting that the speech characteristics within this score are robust and aligned with clinical progression across disease stages. Additional validation work is ongoing, including the development of comparative biomarkers leveraging the combined dataset."

Biomarker • Clinical • Interview • Alzheimer's Disease • CNS Disorders • Dementia

Impact of Study Partner Type on Participant Retention Across Global Regions in the Tauriel and Lauriet Trials for Alzheimer’s Disease (AAIC 2024) - P2 | "Data from the two semorinemab trials suggest that there may be regional differences in the impact of study partner type on retention. Further studies are needed to assess the generalizability of these findings, with an emphasis on cohorts with more representative samples of non-spousal dyads."

Clinical • Alzheimer's Disease • CNS Disorders

Deriving meaningful within-patient change thresholds for the ADCS-ADL in trials of early and mild-to-moderate Alzheimer’s disease - a caregiver-rated, anchor-based analysis of the Tauriel and Lauriet trials (AAIC 2024) - P2 | "Methods : Our anchor-based analyses (and supportive distribution-based analyses) used data from two phase 2 semorinemab trials, Tauriel (NCT03289143; early AD) and Lauriet (NCT03828747; mild-to-moderate AD)... The anchor- and distribution-based approaches suggest that clinically meaningful change on the ADCS-ADL may be greater than the 2 points that has previously been postulated (Dysken et al., 2014). Higher change thresholds may be required to reflect meaningful changes perceptible to caregivers."

Clinical • Alzheimer's Disease • CNS Disorders

Identification of CSF proteins in Alzheimer’s Disease highly correlated with [18F]GTP1 (AAIC 2024) - "Method : AD CSF samples were from participants enrolled in Tauriel or Lauriet, two semorinemab PhII trials...Conclusion : Six CSF proteins highly correlated with tau PET were identified. Validation of these results by replicating the analysis on a secondary dataset with PET and CSF protein measurements may establish further confidence in these findings."

Alzheimer's Disease • CNS Disorders • MAPT • YWHAZ

A Review of Recent Advances in the Management of Alzheimer's Disease. (PubMed, Cureus) - "The conventional pharmacological agents revised comprise cholinesterase inhibitors, monoclonal antibodies, and other therapies, such as memantine, valproic acid, and rosiglitazone. The innovative reviewed pharmacological agents comprise the monoclonal antibodies: donanemab, gantenerumab, solanezumab, bapineuzumab, crenezumab, and semorinemab...Tau and amyloid-targeting treatments include methylthioninium moiety (MT), leuco-methylthioninium bis (LMTM), an oxidized form of MT, and tramiprosate, which inhibits the beta-amyloid (Aβ) monomer aggregation into toxic oligomers...The antidiabetic drugs include NE3107, an anti-inflammatory and insulin sensitizer, and the diabetes mainstream drug metformin. The anti-neuroinflammatory AD therapies include the use of sodium oligomannate (GV-971), infusions with intravenous immunoglobulin aiming to decrease plasma levels of the constituents of Aβ plaques, and masitinib, a tyrosine kinase inhibitor that impacts mast and microglia..."

Journal • Review • Alzheimer's Disease • CNS Disorders • Dementia • Diabetes • Inflammation • Insomnia • Metabolic Disorders • Sleep Disorder

[PREPRINT] Pharmacodynamic effects of semorinemab on plasma and CSF biomarkers of Alzheimer's disease pathophysiology (medRxiv) - P2 | N=457 | Tauriel (NCT03289143) | P2 | N=272 | Lauriet (NCT03828747) | Sponsor: Genentech, Inc. | "Significant increases in plasma phosphorylated Tau 181 (pTau181) and CSF Chitinase-3-like protein 1 (YKL-40) followed administration of semorinemab in both studies. In the Lauriet study, plasma glial fibrillary protein (GFAP) levels rose progressively over the study period in the placebo group, but remained stable over time with the administration of semorinemab. In contrast, this was not observed in the Tauriel study. Semorinemab had no consistent impact on other biomarkers of AD pathophysiology that were evaluated."

P2 data • PK/PD data • Preprint • Alzheimer's Disease • CNS Disorders

[PREPRINT] CSF proteomic analysis of semorinemab Ph2 trials in prodromal-to-mild (Tauriel) and mild-to-moderate (Lauriet) Alzheimer`s disease identifies distinct trial cell-type specific proteomic signatures (medRxiv) - P2 | N=457 | Tauriel (NCT03289143) | P2 | N=272 | Lauriet (NCT03828747) | Sponsor: Genentech, Inc. | "Treatment-induced proteomic signatures were defined for each study as a set of proteins significantly elevated in the treatment arm in the respective study. Integration of the corresponding gene signatures with two independent brain single-nucleus RNA-seq datasets from AD and healthy aged controls revealed that Lauriet signature genes were enriched in microglial cells, while Tauriel signature genes were more broadly expressed across major brain cell types. Furthermore, the Lauriet trial gene signature was significantly upregulated in microglia from AD patients as compared to non-demented controls. The elevation of proteins such as CHI3L1 and GPNMB with treatment suggested an activated glial state."

P2 data • Preprint • Alzheimer's Disease • CNS Disorders