预约演示
更新于：2025-12-09
Crenezumab
克雷内治单抗
更新于：2025-12-09
概要
基本信息
原研机构 |
在研机构 |
最高研发阶段临床2期 |
首次获批日期- |
最高研发阶段(中国)暂停 |
特殊审评- |
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结构/序列
Sequence Code 10232L
来源: *****
Sequence Code 214960H
来源: *****
关联
13
项与 克雷内治单抗 相关的临床试验NCT03977584
Tau PET Longitudinal Substudy Associated With: A Double-Blind, Placebo-Controlled Parallel-Group Study in Preclinical PSEN1 E280A Mutation Carriers Randomized to Crenezumab or Placebo, and in Non-randomized, Placebo-treated Non-carriers From the Same Kindred, to Evaluate the Efficacy and Safety of Crenezumab in the Treatment of Autosomal-Dominant Alzheimer's Disease
This substudy will evaluate the effect of crenezumab on the longitudinal tau burden in a subgroup of preclinical Presenilin1 (PSEN1) E280A mutation carriers and non-carriers, who were enrolled in study NCT01998841 (GN28352). Participants will receive up to three intravenous (IV) injections of [^18F] Genentech Tau Probe 1 (GTP1) and will undergo a tau positron emission tomography (PET) scan after each IV injection of [18^F]GTP1. The purpose of this substudy is to increase the understanding of disease progression in the preclinical stage of familial Alzheimer's Disease (AD).
开始日期2019-06-10 |
申办/合作机构 |
NCT03491150
A Multicenter, Open-Label, Long-Term Extension Of Phase III Studies (BN29552/BN29553) Of Crenezumab In Patients With Alzheimer's Disease
In the BN40031 OLE study, a dose of crenezumab of 60 mg/kg intravenous (IV) every 4 weeks (Q4W) will be offered to all participants who complete Study BN29552 or BN29553 and who meet eligibility criteria in order to evaluate safety in participants on long-term crenezumab treatment and to investigate the effect of crenezumab on the underlying disease process and disease course as an exploratory efficacy objective.
开始日期2018-04-11 |
申办/合作机构 |
NCT03114657
A Phase III, Multicenter, Randomized, Double-Blind, Placebo-Controlled, Parallel-Group, Efficacy and Safety Study of Crenezumab in Patients With Prodromal to Mild Alzheimer's Disease
This randomized, double-blind, placebo-controlled, parallel-group study will evaluate the efficacy and safety of crenezumab versus placebo in participants with prodromal to mild AD. Participants will be randomized 1:1 to receive either intravenous (IV) infusion of crenezumab or placebo every 4 weeks (Q4W) for 100 weeks. The primary efficacy assessment will be performed at 105 weeks. The participants who do not enter open-label extension will enter for a long term follow-up period for up to 52 weeks after the last crenezumab dose (Week 153).
开始日期2017-03-29 |
申办/合作机构 |
100 项与 克雷内治单抗 相关的临床结果
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100 项与 克雷内治单抗 相关的转化医学
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100 项与 克雷内治单抗 相关的专利（医药）
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102
项与 克雷内治单抗 相关的文献（医药）2025-09-01·JOURNAL OF ALZHEIMERS DISEASE
The structural foundations of anti-amyloid-β immunotherapies: Unravelling antibody-antigen interactions in Alzheimer's disease treatment
Review
作者: Miles, Luke A ; Masters, Colin L
Background:
Anti-amyloid-β (Aβ) immunotherapies are emerging as treatments for Alzheimer's disease (AD).
Objective:
This review examines the structure-activity relationships of anti-Aβ therapeutics tested in phase 3 trials.
Methods:
We analyzed crystallographic data and molecular models to elucidate the Aβ binding mechanisms of donanemab, lecanemab, aducanumab, bapineuzumab, gantenerumab, solanezumab, and crenezumab.
Results:
Lecanemab recognizes minimally degraded Aβ missing 1–2 residues, avoiding common Aβ in circulation and further degraded material sequestered in plaques. Bapineuzumab buries the N-terminus of Aβ requiring Asp1 and is reactive with benign, common Aβ. Donanemab buries the truncated N-Glu3 terminus with strong contacts engaging the cyclized pyro-Glu3 modification. Gantenerumab shows lecanemab-like properties but also binds common Aβ. Aducanumab likely needs mAb-mAb cooperation to scavenge a spectrum of Aβ oligomers explaining higher doses. Solanezumab and crenezumab target a pre-amyloid epitope resulting in off-target engagement, including monomers and likely excluding Aβ-ApoE complexes.
Conclusions:
Preventing primary Aβ nucleation failed due to limitations imposed by the blood-brain barrier, intracellular aggregation routes, and the natural abundance of Aβ. Anti-Aβ monoclonal antibody therapies in clinical use capture Aβ at various stages of decay where post translational modifications have been used effectively as proxies for time spent in vivo. By targeting a relatively labile epitope of aging Aβ, lecanemab selects more biologically active species of Aβ avoiding both benign monomers and old fortified species. This focal point may account for the significant cognitive effects of lecanemab. The structure of aducanumab suggests a broadly neutralizing role has evolved for natural immunity to AD.
2025-08-19·Current Neuropharmacology
Structural and Functional Determinants of ARIA-H Risk in Anti-Amyloid Monoclonal Antibodies: A Comparative Mechanistic Framework for Alzheimer's Immunotherapy Development
Article
作者: Xu, Yun ; Zou, Xinxin ; An, Dinghao
Introduction::
Amyloid-beta-targeting monoclonal antibodies (mAbs) for Alzheimer';s disease frequently induce amyloid-related imaging abnormalities with hemorrhage (ARIA-H), yet systematic comparisons of ARIA-H incidence across therapeutic agents remain limited. Post-approval research prioritizes dosing over mechanism, leaving unresolved whether ARIA-H variations originate from intrinsic mAb properties. We address two gaps: comparative ARIA-H risk stratification among clinically available/investigational mAbs, and elucidation of structural/functional features influencing ARIA-H susceptibility.
Methods::
A systematic comparison of seven mAbs (donanemab, aducanumab, bapineuzumab, lecanemab, gantenerumab, crenezumab, solanezumab) was conducted, analyzing clinical trial data and molecular characteristics.
Results::
ARIA-H incidence ranked as follows (highest to lowest): donanemab > aducanumab > bapineuzumab > lecanemab > gantenerumab > crenezumab > solanezumab. Five mAb-specific determinants emerged: (1) Types of Aβ Binding: Enhanced clearance of mature amyloid plaques correlated with elevated ARIA-H risk. (2) Polymer binding Affinity: Reduced small oligomer-binding capacity predicted higher ARIA-H incidence. (3) Epitope location: N-terminal-targeting mAbs showed greater ARIA-H incidence vs. mid/C-terminal binders. (4) Fc region structure: IgG4-based constructs showed higher ARIA-H incidence than IgG1 analogs. (5) Clearance kinetics: Rapid attainment of amyloid reduction thresholds amplified ARIA-H incidence.
Discussion::
We identify a risk hierarchy for ARIA-H among anti-Aβ mAbs and link specific mAb biophysical propertiesAβ binding type, affinity for soluble oligomers, epitope specificity, Fc structure, and plaque clearance dynamicsdirectly to ARIA-H pathogenesis.
Conclusion::
These findings establish a mechanistic framework for ARIA-H risk and provide concrete molecular predictors to guide antibody engineering strategies. Prioritizing mAbs with controlled amyloid clearance, C-terminal binding domains, and IgG1 frameworks may enhance therapeutic safety, advancing precision immunotherapy for Alzheimer';s disease.
2025-05-01·Annals of Indian Academy of Neurology
The Efficacy of Anti-amyloid Monoclonal Antibodies in Early Alzheimer’s Dementia: A Systematic Review
Article
作者: Khan, Farooq ; Baig, Nusrath A ; Tiu, Stephanie ; Mostafa, Alyaa
Abstract:
Introduction::
Much research has been conducted into the role and safety of anti-amyloid monoclonal antibodies on the progression of Alzheimer’s disease (AD). Despite the historical approval of three drugs by the US Food and Drug Administration for the treatment of early AD, there remains other potential treatment, which is yet to be approved or further developed. This systematic review explores the efficacy of anti-amyloid monoclonal antibodies in the treatment of early AD from reported clinical trials.
Methods::
Authors conducted a systematic search of MEDLINE and Embase. Screening was carried out by two authors and cross-checked thereafter. Clinical changes in cognition and objective measures such as cerebrospinal fluid biomarkers and imaging constituted primary and secondary outcomes, respectively.
Results::
Our search yielded 14 randomized controlled trials; the primary focus of the included trials is amyloid-β. The monoclonal antibodies reported in this review are: lecanemab, aducanumab, crenezumab, solanezumab, donanemab, bapineuzumab, and gantenerumab. The most common finding among the trials is the lack of statistically significant results in measures of clinical outcomes, (e.g., Clinical Dementia Rating Scale-Sum of Boxes, AD Assessment Scale-Cognitive Subscale). However, specific trials investigating lecanemab, aducanumab, and donanemab demonstrated promising improvements in clinical cognition. Results related to secondary outcomes were also mixed, but showed more positive findings across the included trials. Overall, primary outcomes were inconsistent with secondary outcomes.
Conclusion::
Our findings highlight the need to consider the complex pathophysiology of AD in treatment development. Focusing solely on the amyloid-beta hypothesis may be inadequate; further research is necessary to understand the underlying mechanisms and develop treatments for the multifactorial nature of the disease.
116
项与 克雷内治单抗 相关的新闻（医药）2025-12-03
·未卜先智
罗氏制药近日披露的最新中期临床数据显示，其用于阿尔茨海默病的新一代抗体药物 trontinemab 在一项正在进行的早期至中期研究中，实现了对脑内β-淀粉样斑块的快速、深度清除，超过九成受试者在约半年内达到PET成像阴性标准。这被视为罗氏在多款阿尔茨海默病候选药物遭遇失败后，再次聚焦抗淀粉样途径的重要节点，也为即将启动的多项三期研究提供了关键依据。
研究与试验背景
Trontinemab 是罗氏开发的一款靶向β-淀粉样蛋白的单克隆抗体，结合了公司自有的 Brainshuttle 技术，旨在提高药物跨血脑屏障的效率，从而更有效地清除脑内淀粉样斑块。与传统单抗相比，该分子通过“双特异性”设计，将抗体与转运结构相连，希望在维持靶向性的同时提高进入中枢神经系统的药物暴露。
该药物目前主要在一项名为 Brainshuttle AD 的一期b/二期临床试验中进行评估，入组对象为轻度至中度阿尔茨海默病患者。研究采用多剂量组设计，通过PET成像和体液生物标志物等多种指标，观察淀粉样负荷变化、安全性及药代特征。
关键PET成像结果
根据公开报道，在Brainshuttle AD研究中，使用 trontinemab 治疗的患者中，约92%在治疗后达到淀粉样水平低于24 centiloid 的预设“阳性阈值”，PET 成像被判定为阴性。此前在同一项目的剂量扩展部分数据中，3.6 mg/kg 剂量组在28周时有约91%的受试者达到PET阴性，且部分患者实现更深层次的“深度清除”，其淀粉样水平降至11 centiloid 以下。
这些结果表明，药物在约6个月内即可在绝大多数受试者中实现显著降低淀粉样负荷的效果，且斑块清除具有剂量依赖性特征。研究方指出，在深部脑区等以往抗体难以充分清除的部位，trontinemab 也显示出斑块负荷明显下降的影像学表现。
生物标志物变化
除PET结果外，试验中还监测了多种阿尔茨海默病相关生物标志物，包括总tau蛋白以及磷酸化tau（如 pTau181、pTau217）和突触相关标志物 neurogranin 等。最新数据提示，在完成既定周期治疗后，这些脑脊液和血浆中的标志物水平均出现早期且显著的降低趋势，与PET所见斑块清除方向一致。
研究方认为，这一组标志物变化为 trontinemab 在抑制病理蛋白积聚方面提供了额外支持，并为后续在认知与功能结局上的探索奠定了生物学基础。不过，目前公开信息主要集中在影像学与生物标志物层面，关于认知和临床功能量表的完整结果尚未披露。
安全性与ARIA信号
在安全性方面，淀粉样相关影像异常（ARIA）仍是关注重点之一。来自Brainshuttle AD研究的最新盲法安全性汇总显示，ARIA-E（脑水肿/渗出）发生率在1.8 mg/kg与3.6 mg/kg两组合计不足5%，在149名受试者中可见病例数为个位数水平，且均为影像学轻度，临床症状轻微且为暂时性。
此前阶段的研究中，曾报告一例接受该药物治疗的78岁女性受试者在试验期间发生脑出血并死亡，后续影像与病史提示其存在脑淀粉样血管病及可能的遗传易感因素。这一事件促使试验方在入组筛查和剂量管理方面做出调整，包括通过MRI加强对潜在高风险人群的排查。目前披露的数据中，除上述个案外，整体出血及ARIA相关不良事件发生率维持在相对较低水平。
三期研究与研发规划
在多次学术会议及公司发布中，罗氏已明确 trontinemab 将进入三期临床阶段，覆盖早期症状性阿尔茨海默病以及临床前期高风险人群。其中，两项名为 TRONTIER 1 和 TRONTIER 2 的三期试验将以3.6 mg/kg剂量为核心方案，重点评估在早期有症状患者中的认知和功能结局，并纳入生活自理能力和心理健康等多维度终点。
此外，罗氏还规划一项名为 PrevenTRON 的三期研究，面向尚处临床前期但已存在生物标志物异常的人群，以评估在疾病早期甚至症状出现前使用该药物是否能够延缓或阻止临床症状的发生。公司表示，当前一期b/二期项目中获得的PET和生物标志物结果，是启动上述三期项目的重要依据之一。
与既往项目的承接
在此之前，罗氏在阿尔茨海默病领域已投入多年，但多款候选药物在三期试验中未能达到预设的临床终点，包括单抗 crenezumab 和 gantenerumab 等。相关试验的阴性结果导致公司一度调整阿尔茨海默病管线布局，并终止部分与合作方的抗体项目授权安排。
在此背景下，trontinemab 被视为基于既往经验迭代的新一代候选分子，其通过引入Brainshuttle平台试图提高跨血脑屏障效率，同时在剂量与给药方案上借鉴前几代抗体的安全性与有效性数据。当前披露的中期结果显示，该药物在斑块清除速度和深度上较以往抗淀粉样抗体有较为突出的表现，为公司在这一治疗方向上继续推进提供了新的基础。
相关诊断工具与配套布局
在药物研发之外，罗氏也在阿尔茨海默病诊断与监测领域同步推进配套产品，包括血液和体液生物标志物检测项目。近期，一款用于检测阿尔茨海默病相关生物标志物的血液检测产品已获得美国监管机构的批准，用于帮助评估是否存在淀粉样病理，从而为用药选择和试验入组提供参考。
公司在多个国际会议上还展示了利用 pTau 等血浆标志物改善早期筛查与风险分层的研究数据，试图构建从早期识别到干预随访的整体解决方案。在trontinemab 的临床研究中，上述诊断和标志物工具亦被用于辅助评估病理变化与治疗反应，为后续大规模三期试验的设计提供基础数据支撑。
Source：
BioSpace: Roche Is Back in Alzheimer’s as Latest Antibody Clears Amyloid Plaques
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2025-12-02
Taylor Tieden for BioSpace
Trontinemab lowered amyloid levels below the threshold of positivity in 92% of treated patients.
More than nine in 10 patients treated with Roche’s next-generation Alzheimer’s disease antibody trontinemab tested negative for amyloid plaques in a mid-stage study, marking a return to the neurodegenerative disease for the Swiss pharma after years away to recalibrate.
In the ongoing Phase I/II Brainshuttle AD study, 92% of patients treated with trontinemab achieved amyloid levels below 24-centiloid, a key disease threshold used to determine the presence of amyloid plaques on a PET scan. A biomarker analysis also indicated that trontinemab has a potential effect on the accumulation of tau protein in the brain. These data were presented Monday at the 2025 Clinical Trials on Alzheimer’s Disease (CTAD) meeting, according to Roche’s presentation shared with
BioSpace
.
Aside from efficacy, Brainshuttle AD also looked at the safety of trontinemab and found that amyloid-related imaging abnormalities indicative of swelling or bleeding in the brain remained under 5%. This is a key safety issue that has been observed in patients taking approved Alzheimer’s medicines Leqembi, by Eisai and Biogen, and Kisunla by Eli Lilly.
The Brainshuttle AD study is ongoing, with a primary completion date of
June 30, 2030
. But on the back of the interim findings, Roche is already charting the late-stage development of trontinemab. In July, the pharma announced
plans to launch
the Phase III TRONTIER 1 and 2 studies this year.
At CTAD, Roche provided more insight into the design of these two late-stage studies, which are “identical” trials that will focus on patients with early symptomatic Alzheimer’s disease. Primarily, TRONTIER 1 and 2 will look at the clinical benefit of trontinemab in improving dementia severity. The studies aim to enroll around 1,600 patients across 18 countries.
TRONTIER 1 and 2 will also look at other “outcomes relevant to people with” Alzheimer’s disease, Roche said, pointing to measures of mental health and independence. The pharma is also planning to run the Phase III PrevenTRON trial in preclinical Alzheimer’s disease.
Trontinemab is a monoclonal antibody designed to target amyloid-beta, designed with Roche’s proprietary Brainshuttle technology, with the goal of improving permeability across the blood-brain barrier.
Trontinemab represents a major comeback for Roche in the Alzheimer’s disease space, after multiple key candidates failed several years ago. Roche’s monoclonal antibody crenezumab failed in mid-2019,
unable to demonstrate
significant clinical benefit in patients with early-stage disease in two Phase III studies.
Then, in November 2022, Roche’s follow-up candidate gantenerumab likewise delivered
back-to-back late-stage disappointments
, forcing the industry to
reassess
the amyloid approach to Alzheimer’s. Roche was forced to bow out as Biogen, Eisai and Lilly ushered their candidates to the market.
临床3期临床结果临床2期
2025-11-25
Claude Sonnet 4.5撰写，注意甄别摘要
阿尔茨海默病(Alzheimer's disease, AD)是全球最常见的神经退行性疾病,药物开发历经40年艰辛探索。本综述系统梳理了AD在售药物的分类、发展历程、作用机制,重点分析了三款已上市的抗淀粉样蛋白单克隆抗体(aducanumab、lecanemab、donanemab)的结构差异、结合特性与临床疗效的关系,总结了已失败的临床试验,并展望了在研药物管线的前沿进展。1. 小分子药物:按治疗路径分类与发展时间线1.1 药物分类列表
表1. 阿尔茨海默病在售小分子药物分类治疗路径药物名称商品名作用机制批准年份批准适应症给药途径胆碱能增强
Tacrine
Cognex
非选择性AChE抑制剂
1993
轻至中度AD
口服
Donepezil
Aricept/Adlarity
可逆性AChE抑制剂
1996/2022
轻、中、重度AD
口服/透皮贴剂
Rivastigmine
Exelon
AChE和BuChE抑制剂
2000
轻至中度AD
口服/透皮贴剂
Galantamine
Razadyne
AChE抑制剂+烟碱受体调节
2001
轻至中度AD
口服谷氨酸调节
Memantine
Namenda
NMDA受体拮抗剂
2003
中至重度AD
口服复方制剂
Donepezil+Memantine
Namzaric
AChE抑制剂+NMDA拮抗剂
2014
中至重度AD
口服
注: Tacrine因肝毒性于2012年退市[1][2]。1.2 药物发展时间线与详述1993: Tacrine (他克林)
发现与开发: Tacrine是首个获FDA批准的AD治疗药物,标志着AD药物治疗的开端[1]。它于1986年开始临床试验,1993年9月9日获批用于轻至中度AD[2]。Tacrine是一种非选择性胆碱酯酶抑制剂,可同时抑制乙酰胆碱酯酶(AChE)和丁酰胆碱酯酶(BuChE)[3]。
作用机制: 通过抑制AChE降解乙酰胆碱,增加突触间隙乙酰胆碱浓度,改善胆碱能神经传递[4]。
退市原因: 由于显著的肝毒性(40-50%患者出现血清转氨酶升高)、需每日四次给药的不便性以及疗效有限,Tacrine于2012年被Warner-Lambert公司停产[1][2][5]。1996: Donepezil (多奈哌齐)
发现与开发: Donepezil的研发始于1983年,由日本卫材(Eisai)公司开发,1996年11月25日获FDA批准,商品名Aricept[6][7][8]。它是tacrine退市后AD治疗的主导药物,至今仍是全球处方量最大的AD药物[9]。2022年,透皮贴剂剂型(Adlarity)获批,改善了给药依从性[10]。
作用机制: Donepezil是高选择性、可逆性的中枢性AChE抑制剂,对AChE的选择性是BuChE的1250倍[11][12]。其半衰期长达70小时,允许每日一次给药[13]。
临床证据: 一项涉及>1000篇文献的回顾显示,donepezil可改善轻至重度AD患者的认知功能(ADAS-Cog评分改善2-3分)和日常生活能力[14]。网络meta分析表明,donepezil在认知改善方面显示最高疗效水平[15]。
药物基因组学: CYP2D6和CYP3A4基因多态性影响donepezil代谢,但尚未在临床常规应用[14]。2000: Rivastigmine (卡巴拉汀)
发现与开发: Rivastigmine由Novartis开发,2000年4月13日获FDA批准,商品名Exelon[16][17]。它是首个获批用于轻至中度AD的双重胆碱酯酶抑制剂[18]。透皮贴剂剂型于2007年获批,显著降低了胃肠道副作用[19]。
作用机制: Rivastigmine是准不可逆(pseudo-irreversible)的AChE和BuChE抑制剂,通过氨基甲酰化酶的活性位点形成共价键,抑制时间长达10小时[20][21]。其独特之处在于同时抑制两种胆碱酯酶,理论上可提供更广泛的胆碱能增强[22]。
临床证据: 在轻至中度AD患者中,rivastigmine可改善认知功能和日常生活能力,疗效与donepezil相当[23]。透皮贴剂显示出更好的耐受性,胃肠道副作用发生率降低50%[24]。
特殊应用: Rivastigmine也被批准用于帕金森病痴呆(PDD),是唯一获此适应症的胆碱酯酶抑制剂[25]。2001: Galantamine (加兰他敏)
发现与开发: Galantamine最初从雪花莲(Galanthus)中提取,具有数千年的植物药用历史[26]。现代合成版本由Janssen和Shire公司开发,2001年2月28日获FDA批准,商品名Razadyne(原名Reminyl)[27][28]。
作用机制: Galantamine具有双重作用机制:(1)竞争性、可逆性AChE抑制;(2)变构调节烟碱型乙酰胆碱受体(nAChRs),特别是α4β2和α7亚型,增强胆碱能神经传递[29][30][31]。这种独特的烟碱受体调节作用理论上可提供神经保护效应[32]。
临床证据: 在轻至中度AD患者中,galantamine显示出与donepezil相当的认知改善效果[15]。网络meta分析显示galantamine在认知功能改善方面排名第一或第二[15][33]。2003: Memantine (美金刚)
发现与开发: Memantine的历史可追溯至1963年,最初由Eli Lilly合成,作为潜在的降糖药物[34]。1986年开始作为痴呆治疗进入临床试验,1989年在德国首次上市,2003年10月16日获FDA批准用于中至重度AD,商品名Namenda[35][36][37]。
作用机制: Memantine是首个也是唯一获批的NMDA(N-甲基-D-天冬氨酸)受体非竞争性拮抗剂,具有中等亲和力(Ki=0.5μM)和快速解离动力学[38][39]。其独特作用机制包括:阻断病理性谷氨酸兴奋性毒性:
在慢性谷氨酸过度释放时阻断NMDA受体,防止钙离子过度内流和神经元死亡[40]保留生理性神经传递:
由于快速解离特性,memantine允许正常的生理性NMDA受体激活,不影响学习和记忆功能[41]电压依赖性阻断:
仅在过度去极化状态下阻断受体,保护机制更精准[42]
临床证据: Meta分析显示memantine在中至重度AD患者中可改善认知功能(MMSE改善0.99分)、整体功能和日常生活能力[43][44]。与胆碱酯酶抑制剂联合使用可能产生协同效应[45]。
更新进展: 2024年研究显示memantine可能通过调节突触可塑性和减少tau蛋白过度磷酸化提供额外的神经保护作用[46][47]。2014: Donepezil+Memantine 复方制剂
发现与开发: 2014年12月23日,FDA批准了donepezil和memantine的固定剂量复方制剂(Namzaric),用于中至重度AD患者[48][49]。这是首个结合胆碱能增强和谷氨酸调节的复方制剂。
理论基础: 联合治疗针对AD的两个不同病理机制:胆碱能功能缺失和谷氨酸兴奋性毒性,理论上可提供更全面的症状控制[50]。
临床证据: 一项24周的双盲研究显示,联合治疗在中至重度AD患者中比单用memantine显示出更显著的认知和功能改善[51]。长期研究(52周)显示联合治疗延缓了认知衰退和功能恶化[52]。1.3 小分子药物的局限性
尽管这些小分子药物已使用20-30年,但它们仅提供症状性治疗,不能改变疾病进程[53][54]。Meta分析显示,胆碱酯酶抑制剂的平均疗效仅为2-3个ADAS-Cog评分点,临床意义有限[55][56]。此外,约30-50%患者因胃肠道副作用(恶心、呕吐、腹泻)而停药[57]。这些局限性推动了疾病修饰疗法(disease-modifying therapies, DMTs)的开发,特别是靶向淀粉样蛋白的单克隆抗体[58][59]。2. 靶向Aβ的单克隆抗体:三款上市药物的深度分析2.1 概述
截至2025年,三款靶向Aβ的单克隆抗体已获FDA批准用于早期AD治疗,它们代表了AD药物开发史上的重大突破,是首批被证明能够减缓认知衰退的疾病修饰疗法[60][61][62]。
表2. 已上市抗Aβ单克隆抗体药物对比特征Aducanumab (Aduhelm)Lecanemab (Leqembi)Donanemab (Kisunla)制造商
Biogen/Eisai
Eisai/Biogen
Eli LillyFDA批准日期
2021年6月7日(加速批准)
2023年7月6日(完全批准)
2024年7月2日(完全批准)批准适应症
轻度AD或MCI
早期AD(MCI或轻度痴呆)
早期症状性AD抗体类型
人源化IgG1
人源化IgG1
人源化IgG1靶向Aβ形式
可溶性寡聚体和纤维状斑块
可溶性原纤维(protofibrils)
不溶性纤维状斑块(N3pG修饰)给药方式
静脉输注,每4周一次
静脉输注,每2周一次
静脉输注,每4周一次剂量
10 mg/kg
10 mg/kg
700 mg(固定剂量)或10-14 mg/kg临床试验名称
ENGAGE/EMERGE
Clarity AD
TRAILBLAZER-ALZ 2主要疗效终点
CDR-SB:22-23%减缓(18个月)
CDR-SB:27%减缓(18个月)
iADRS:35-36%减缓(18个月);CDR-SB:29-36%(76周)Aβ清除率(PET)
59-71%(78周)
68.1%(18个月)
84.8%(76周)ARIA-E发生率
35.2%(高剂量组)
12.6%
24.0%ARIA-H发生率
19.1%
17.3%
31.4%市场状态
2024年11月停产
在售
在售2.2 Aducanumab (Aduhelm):首个获批但争议最大2.2.1 开发历程
Aducanumab由Biogen与Eisai联合开发,其发现源于一项独特的"反向转化医学"研究:科学家从健康老年人血清中筛选出能够识别Aβ聚集体的天然抗体,aducanumab因其高亲和力脱颖而出[63][64]。
临床试验时间线:2015-2019:
两项平行的III期临床试验(ENGAGE, NCT02477800; EMERGE, NCT02484547)招募了3285名早期AD患者[65]2019年3月:
因无效性分析显示不太可能达到主要终点,Biogen宣布终止试验,引发全球震惊[66]2019年10月:
戏剧性反转,Biogen宣布在新增数据分析中,EMERGE试验高剂量组显示统计学显著的认知获益,决定向FDA提交上市申请[67]2021年6月7日:
FDA通过加速批准途径批准aducanumab,引发科学界和监管机构内部的激烈争议[68][69]2024年11月:
Biogen宣布停止aducanumab的生产和销售,结束了这一充满争议的历程[70]2.2.2 作用机制
Aducanumab是一种人源化IgG1单克隆抗体,具有独特的双重靶向特性[71][72]:主要靶点:
聚集态Aβ,包括可溶性寡聚体和不溶性纤维状斑块结合位点:
Aβ肽段的N端(氨基酸3-7位),这一区域在聚集后构象变化暴露清除机制:
通过Fc受体介导的小胶质细胞吞噬作用清除脑内Aβ斑块[73]2.2.3 临床数据
EMERGE试验(阳性试验):
高剂量组(10 mg/kg)在18个月时CDR-SB评分减缓23%(p=0.01)[74]
MMSE评分改善15%(p=0.04)
ADAS-Cog13改善27%(p=0.01)
PET显像显示Aβ斑块负荷降低59-71%[75]
ENGAGE试验(阴性试验):
未达到主要终点,无统计学显著改善[76]
这一不一致性成为FDA批准决定的主要争议点
安全性问题:ARIA-E(淀粉样蛋白相关影像异常-水肿/渗出):
35.2%[77]ARIA-H(微出血/含铁血黄素沉积):
19.1%[78]
APOE ε4携带者ARIA风险显著增加(纯合子>50%)[79]2.2.4 争议与停产
FDA的批准决定引发前所未有的争议[80][81]:疗效争议:
两项试验结果不一致,FDA自己的咨询委员会以10:0投票反对批准[82]临床意义质疑:
0.39分的CDR-SB改善是否具有临床意义存疑[83]高昂价格:
最初定价$56,000/年,后降至$28,200,但仍被认为性价比低[84]有限使用:
Medicare最初拒绝覆盖,严重限制了临床应用[85]
2024年11月,Biogen正式宣布停止aducanumab的生产和销售,理由是临床应用极为有限,转而专注于lecanemab[70][86]。2.3 Lecanemab (Leqembi):当前的金标准2.3.1 开发历程
Lecanemab(原名BAN2401)由瑞典BioArctic公司开发,Eisai和Biogen获得全球开发和商业化权利[87][88]。其设计基于对Aβ聚集级联的深入理解,特异性靶向早期毒性形式的Aβ。
临床试验时间线:2016-2018:
IIb期研究(Study 201)显示剂量依赖性的Aβ清除和认知获益趋势[89]2019-2022:
III期临床试验Clarity AD(NCT03887455)招募1795名早期AD患者[90]2023年1月6日:
FDA通过加速批准途径批准lecanemab[91]2023年7月6日:
FDA授予完全批准(传统批准),成为首个通过完整III期试验验证的抗Aβ抗体[92][93]2024年:
全球多个国家/地区批准,包括日本、中国、欧盟(有条件批准)[94]2.3.2 作用机制
Lecanemab具有高度特异性的靶向特性,这是其安全性和疗效优势的关键[95][96]:主要靶点:
可溶性Aβ原纤维(protofibrils),这是介于单体和成熟纤维斑块之间的中间聚集形式,被认为是最具神经毒性的Aβ形式[97][98]结合特性:
对原纤维的亲和力比单体高1000倍以上,比成熟纤维高10-100倍[99]结合位点:
Aβ肽段的中段和C端区域清除机制:
(1)直接中和可溶性原纤维的毒性;(2)通过小胶质细胞介导的吞噬作用清除;(3)可能阻止原纤维向成熟斑块转化[100][101]2.3.3 临床数据
Clarity AD试验:主要终点达成:
18个月时CDR-SB评分恶化减缓27%(0.45分 vs 0.67分,p<0.001),这是抗Aβ抗体试验中最强的临床信号[102][103]次要终点:
ADAS-Cog14:改善26%(p<0.001)
ADCOMS:改善24%(p<0.001)
日常生活能力(ADCS-MCI-ADL):改善37%(p<0.001)[104]Aβ清除:
PET显像显示18个月时Aβ斑块负荷降低68.1%,59.1%患者达到淀粉样蛋白阴性[105]生物标志物改变:
血浆p-tau217降低26.9%,提示下游病理减轻[106]
长期扩展研究(AHEAD 3-45):正在进行的研究评估lecanemab在临床前AD(仅有Aβ沉积无症状)患者中的预防作用[107]。
安全性特征:ARIA-E:
12.6%(vs 安慰剂1.7%),其中大多数为轻至中度,通常在3个月内消退[108]ARIA-H:
17.3%(微出血14.0%,含铁血黄素沉积8.3%)[109]严重不良事件:
总体发生率与安慰剂相似(14.0% vs 11.3%)[110]APOE ε4相关风险:
ε4纯合子ARIA-E发生率达33.5%,但仍低于aducanumab[111]2.3.4 临床应用考量
适合人群:
确诊的早期AD(MCI或轻度痴呆阶段)
生物标志物证实的Aβ阳性(通过PET或CSF)
MMSE评分≥22[112]
监测要求:
治疗前进行MRI基线扫描,排除已存在的微出血/出血
前7个月每3个月进行一次MRI监测ARIA
APOE ε4基因型检测推荐但非强制[113]
实际疗效意义:多项分析显示lecanemab的疗效具有临床意义[114][115]:
27%的减缓相当于延迟疾病进展约7.5个月
预计可推迟患者需要全时照护的时间约2-3年[116]
成本效益分析显示,尽管年治疗费用$26,500,但考虑到照护成本节省,仍具有卫生经济学价值[117]2.4 Donanemab (Kisunla):最新且可能最有效2.4.1 开发历程
Donanemab由Eli Lilly独立开发,采用了与前两款抗体不同的靶向策略,专注于成熟的斑块形式[118][119]。
临床试验时间线:2017-2021:
II期试验TRAILBLAZER-ALZ(NCT03367403)显示强劲疗效信号[120]2020-2023:
III期试验TRAILBLAZER-ALZ 2(NCT04437511)招募1736名早期AD患者[121]2024年7月2日:
FDA授予完全批准,成为第二款获完全批准的抗Aβ抗体[122][123]2.4.2 作用机制
Donanemab的独特性在于其高度特异的靶点选择[124][125]:主要靶点:N3pG-modified Aβ
(N端第3位谷氨酸发生焦谷氨酸化修饰的Aβ),这是沉积在脑斑块中的主要Aβ形式,占斑块Aβ的50-90%[126]靶向逻辑:
N3pG修饰仅发生在聚集/沉积的Aβ中,可溶性Aβ不具有此修饰,因此donanemab几乎不结合可溶性Aβ或CAA相关的Aβ[127]清除机制:
高亲和力结合成熟斑块,募集小胶质细胞进行快速吞噬清除[128]独特特征:
"治疗至斑块清除"策略—一旦PET显示Aβ斑块降至阴性阈值以下,即可停药[129]2.4.3 临床数据
TRAILBLAZER-ALZ 2试验:该试验采用创新的分层设计,根据基线tau病理分为低/中度tau组和高tau组[130]。
主要终点(iADRS综合评分):低/中度tau组:
76周时减缓35%(p<0.001),这是迄今抗Aβ抗体试验中最强的疗效信号[131]全体人群:
减缓22%(p=0.004)[132]高tau组:
疗效减弱(仅11%,未达统计显著性),提示tau病理晚期患者获益有限[133]
次要终点:CDR-SB:
低/中度tau组减缓36%,全体减缓29%[134]ADAS-Cog13:
减缓26%[135]Aβ清除:
76周时PET显示Aβ负荷降低84.8%,80.1%患者达到淀粉样蛋白阴性[136]血浆p-tau217:
降低高达43%,提示强劲的下游病理改善[137]
停药策略的可行性:40.9%的donanemab治疗患者在76周内达到Aβ阴性并停药,其中大多数在停药后仍维持临床获益[138]。这一策略可能显著降低长期治疗成本和ARIA风险。
安全性特征:ARIA-E:
24.0%(vs 安慰剂1.9%)[139]ARIA-H:
31.4%(微出血19.7%),高于lecanemab,可能与对斑块的强力清除作用有关[140]3例ARIA相关死亡:
引发关注,但因果关系尚不明确(可能与合并使用抗凝药物有关)[141]APOE ε4纯合子:
ARIA-E发生率达到40-50%,需谨慎评估风险-获益比[142]2.5 三款抗体的结构差异与结合特性比较2.5.1 结构特征
尽管三款抗体均为人源化IgG1,但在结合特异性和亲和力上存在显著差异[143][144]。
表3. 三款抗体的结合特性详细比较特性AducanumabLecanemabDonanemab结合表位
Aβ N端(aa 3-7)
Aβ中段/C端
N3pG-modified Aβ(N端焦谷氨酸化)对可溶性单体亲和力
低
极低(Kd>100 nM)
无/极低对原纤维亲和力
中等
极高(Kd<0.3 nM)
低(因不含N3pG)对成熟斑块亲和力
高
中等
极高对CAA结合
高
中等
低Aβ选择性指数
广谱(寡聚体+纤维)
高度选择(原纤维>其他形式1000倍)
极高选择(仅N3pG修饰)体外Aβ清除EC50
0.5-2 nM
0.3 nM
0.1-0.5 nM2.5.2 分子机制解析
Aducanumab的"广谱"问题:Aducanumab结合Aβ的N端3-7位氨基酸序列(EFRH),该表位在所有聚集形式和部分单体中暴露[145]。这导致:
同时结合可溶性寡聚体和不溶性斑块
强烈结合血管淀粉样变(CAA),这被认为是高ARIA-E发生率的主要原因[146][147]
可能耗竭部分具有保护作用的可溶性Aβ[148]
Lecanemab的"精准打击":Lecanemab通过识别Aβ聚集过程中形成的构象表位,实现高选择性[149][150]:
原纤维的β折叠结构暴露特定的构象表位,lecanemab仅识别此构象
对可溶性单体和成熟纤维的亲和力比原纤维低1000-10000倍
对CAA的结合显著低于aducanumab,可能解释了其较低的ARIA发生率[151][152]
Donanemab的"后修饰特异性":N3pG修饰是Aβ聚集后发生的不可逆化学变化,仅存在于沉积的斑块中[153][154]:
Donanemab的抗原识别完全依赖于焦谷氨酸化修饰,几乎不结合未修饰的Aβ
CAA中的Aβ较少发生N3pG修饰,因此donanemab对CAA结合力极低[155]
这一特性理论上应降低ARIA风险,但实际临床数据显示ARIA-H发生率反而最高,可能与快速斑块清除导致的局部组织反应有关[156]2.6 结合能力越强,疗效是否越好?深度分析
这是AD药物开发中的一个关键悖论:更强的Aβ结合力不一定带来更好的临床疗效,反而可能增加安全性风险[157][158]。2.6.1 Aβ清除率与认知疗效的关系
表4. 三款抗体的Aβ清除与认知改善对比指标AducanumabLecanemabDonanemabPET Aβ清除率(%)
59-71%(78周)
68.1%(18个月)
84.8%(76周)认知减缓(CDR-SB)
22-23%(18个月,EMERGE)
27%(18个月)
29-36%(76周,分层)ARIA-E发生率(%)
35.2%
12.6%
24.0%ARIA-H发生率(%)
19.1%
17.3%
31.4%治疗中断率(%)
高(约25-30%)
低(约6.9%)
中等(约14%)
关键发现:Aβ清除与疗效非线性关系:
Donanemab的Aβ清除率最高(84.8%),认知疗效也最强;但aducanumab清除率达59-71%时,疗效仅22%且试验结果不一致[159][160]。"最佳靶点"假说:
Lecanemab的数据支持"靶向中间聚集体(原纤维)比终末聚集体(成熟斑块)更有效"的理论,因为原纤维是当前正在行使毒性的形式,而成熟斑块可能已相对惰性[161][162]。时机窗口至关重要:
TRAILBLAZER-ALZ 2显示,在低/中度tau患者(疾病更早期)中疗效显著更强(35% vs 11%),提示Aβ清除的获益在tau病理尚未广泛扩散前最大[163][164]。2.6.2 ARIA风险与结合特性的关系
多项研究揭示了ARIA发生机制与抗体结合特性的复杂关系[165][166]:
ARIA-E(水肿/渗出):主要机制:
抗体结合CAA引发血管炎症反应,导致血-脑屏障(BBB)破坏[167]与CAA结合力的相关性:
Aducanumab > Donanemab > Lecanemab(与ARIA-E发生率趋势一致)[168][169]2025年体外研究:
使用人脑组织切片的结合实验显示,aducanumab对CAA的结合信号强度是lecanemab的3-5倍[170]
ARIA-H(微出血):主要机制:
快速斑块清除导致血管周围组织结构改变,或直接损伤血管壁[171]与清除速度的相关性:
Donanemab > Lecanemab > Aducanumab(donanemab最快清除斑块,ARIA-H也最高)[172]悖论现象:
Donanemab对CAA结合力最低,但ARIA-H最高,提示其他机制参与(如快速吞噬反应引发的局部炎症)[173]2.6.3 "Goldilocks原则"—恰到好处的结合力
系统性比较研究提出了**"适度结合假说"(Moderate Binding Hypothesis)**[174][175]:过强结合(如aducanumab对CAA):
导致过度免疫激活,BBB破坏,ARIA-E高发过弱结合:
无法有效清除Aβ,疗效不足(如早期失败的crenezumab)[176]适度且选择性结合(如lecanemab):
有效清除致病性Aβ形式,同时最小化对血管和非致病性Aβ的影响
2024年计算建模研究[177]: 使用分子动力学模拟和平衡结合实验,研究者发现:
Lecanemab对原纤维的结合亲和力(Kd≈0.3 nM)与其对斑块Aβ的清除能力和ARIA风险之间达到最优平衡
Aducanumab对所有形式Aβ的"无差别"高亲和力(Kd≈0.5-2 nM)导致靶向特异性不足
Donanemab对N3pG-Aβ的极高特异性(Kd<0.1 nM)虽然最小化了脱靶效应,但快速清除动力学可能触发过度的炎症反应2.6.4 结论:疗效取决于"靶向精准度",而非单纯"结合强度"
综合证据支持以下结论[178][179][180]:精准性>强度:
Lecanemab的成功表明,高度选择性靶向毒性Aβ形式(原纤维)比广谱高亲和力结合更有效且更安全疾病阶段匹配:
Donanemab在低tau患者中的卓越疗效(35%)表明,斑块清除的获益窗口在疾病早期;晚期患者tau病理占主导,单纯清除Aβ收益有限风险-获益平衡:
Lecanemab的中等ARIA发生率(ARIA-E 12.6%)和强劲疗效(27%)使其成为当前最优选择;Donanemab虽疗效更强但ARIA-H风险也更高,需个体化权衡未来方向:
下一代抗体应优化靶向特异性(如lecanemab)同时提高清除效率(如donanemab的停药策略),并开发ARIA预测和预防策略3. 已失败的AD药物:教训与启示
AD药物开发是失败率最高的领域之一,2002-2022年间成功率仅3.6%[181][182]。理解失败原因对未来药物开发至关重要。3.1 失败药物汇总
表5. 主要失败的AD候选药物(2012-2024)药物名称作用机制靶点制造商失败阶段失败时间失败原因抗Aβ单克隆抗体
Bapineuzumab
被动免疫
Aβ N端(1-5)
Pfizer/JNJ
Phase 3
2012年8月
无效+高ARIA(APOE ε4携带者)[183][184]
Solanezumab
被动免疫
可溶性Aβ单体(16-26)
Eli Lilly
Phase 3
2016年11月
无认知改善(EXPEDITION-3)[185][186]
Gantenerumab
被动免疫
Aβ N端+C端(构象表位)
Roche
Phase 3
2022年11月
Aβ清除显著但无认知获益(GRADUATE 1&2)[187][188]
Crenezumab
被动免疫
Aβ寡聚体(IgG4,低效应功能)
Roche/Genentech
Phase 3
2019年1月
无效(CREAD 1&2)[189][190]
Ponezumab
被动免疫
Aβ C端(33-40)
Pfizer
Phase 2
2012
无效 [191]BACE抑制剂(口服小分子)
Verubecestat (MK-8931)
BACE1抑制
β分泌酶
Merck
Phase 3
2017年2月
无效+认知恶化趋势(EPOCH)[192][193]
Lanabecestat (AZD3293)
BACE1抑制
β分泌酶
Eli Lilly/AstraZeneca
Phase 3
2018年6月
无效+认知恶化(AMARANTH/DAYBREAK)[194][195]
Atabecestat (JNJ-54861911)
BACE1抑制
β分泌酶
Janssen/JNJ
Phase 2/3
2018年5月
肝酶升高安全性问题[196][197]
Elenbecestat (E2609)
BACE1抑制
β分泌酶
Eisai/Biogen
Phase 3
2019年9月
无效+体重减轻/睡眠障碍(MISSION AD1&2)[198][199]
Umibecestat (CNP520)
BACE1抑制
β分泌酶
Novartis/Amgen
Phase 2/3
2019年7月
认知恶化(预防试验)[200][201]
LY3202626
BACE1抑制
β分泌酶
Eli Lilly
Phase 2
2018年10月
无效可能性高,提前终止[202]γ分泌酶调节剂
Semagacestat (LY450139)
γ分泌酶抑制
γ分泌酶
Eli Lilly
Phase 3
2010年8月
认知恶化+皮肤癌风险↑[203][204]
Avagacestat (BMS-708163)
γ分泌酶抑制
γ分泌酶
Bristol-Myers Squibb
Phase 2
2012
皮肤癌+无效[205]抗Tau抗体
Gosuranemab (BIIB092)
被动免疫
细胞外tau(N端)
Biogen
Phase 2
2021年12月
无临床获益[206][207]
Tilavonemab (ABBV-8E12)
被动免疫
细胞外tau
AbbVie
Phase 2
2019年7月
无效[208][209]
Semorinemab (RO7105705)
被动免疫
细胞外tau(N端)
Roche/Genentech
Phase 2
2021年8月
无效[210][211]
Zagotenemab (LY3303560)
被动免疫
细胞外tau(微管结合区)
Eli Lilly
Phase 2
2020
无效[212]其他机制
Azeliragon (TTP488)
RAGE拮抗剂
晚期糖基化终产物受体
vTv Therapeutics
Phase 3
2018年
无效[213]
Masitinib
酪氨酸激酶抑制
KIT/CSF1R(神经炎症)
AB Science
Phase 3
2024年(EMA拒绝)
疗效证据不足,设计缺陷[214][215]3.2 失败模式分析3.2.1 抗Aβ抗体失败:从Bapineuzumab到Gantenerumab
Bapineuzumab(2012):机制:
靶向Aβ N端1-5位氨基酸,与天然抗体3D6相似[216]失败原因:
两项III期试验(研究301, 302)未达主要终点[217]
APOE ε4携带者ARIA-E发生率高达15%(非携带者<2%)[218]
可能过于强烈结合CAA,导致血管并发症限制了剂量提升[219]教训:
APOE ε4基因型需纳入试验分层;CAA结合需最小化
Solanezumab(2016):机制:
靶向可溶性Aβ单体中段(16-26位),理论上阻止聚集[220]失败原因:
EXPEDITION-3试验(2129名轻度AD患者)主要终点阴性[221]
尽管降低了CSF可溶性Aβ,但不清除脑内斑块(PET无变化)[222]
事后分析提示可能需要更早期干预(临床前阶段)[223]教训:
单纯结合可溶性Aβ单体不足以产生临床获益;需要实际清除聚集体
Gantenerumab(2022):机制:
完全人源IgG1,结合Aβ N端和C端的构象表位,高Fc介导吞噬能力[224]失败原因:
GRADUATE 1&2试验显示Aβ斑块清除显著(高剂量组-54.8%),但CDR-SB无统计学改善[225][226]
可能剂量仍不足,或患者选择过晚(包含较多中度AD患者)[227]
ARIA发生率高(ARIA-E 19.6%, ARIA-H 28.7%),限制了剂量提升[228]教训:
Aβ清除是必要但非充分条件;疾病阶段选择至关重要
Crenezumab(2019):机制:
IgG4抗体,低Fc效应功能,靶向Aβ寡聚体[229]失败原因:
IgG4设计初衷是降低ARIA风险,但同时降低了清除效率[230]
CREAD试验显示Aβ清除非常有限,无临床获益[231]教训:
过度降低免疫效应功能会牺牲疗效;IgG1可能是必须的3.2.2 BACE抑制剂的"集体阵亡"
BACE(β-site APP-cleaving enzyme)抑制剂理论上可从源头阻断Aβ生成,但至少6款候选药物在2017-2019年集体失败,引发对该策略的根本性质疑[232][233]。
共同失败特征:认知恶化:
多项试验观察到治疗组认知评分恶化快于安慰剂组[234][235]生理功能障碍:
体重减轻、睡眠障碍、毛发/皮肤颜色改变等[236]生物标志物矛盾:
CSF Aβ42降低(符合预期),但tau/p-tau未改善,甚至升高[237]
失败机制解析:BACE1的生理功能广泛:
BACE1不仅切割APP,还处理其他重要底物(如神经调节素、Na通道β亚单位、SEZ6),过度抑制导致多种生理功能障碍[238][239]时机窗口已过:
AD患者脑内Aβ沉积已持续10-20年,此时阻断新生成的Aβ可能为时已晚[240]补偿性Aβ上调:
长期抑制BACE1可能触发APP表达上调等补偿机制[241]
Verubecestat的警示案例:
Merck的verubecestat是首个失败的BACE抑制剂,2017年EPOCH试验(1958名轻至中度AD患者)显示高剂量组认知恶化反而更快[242][243]
这一结果震惊了整个领域,并引发了对"Aβ假说"本身的质疑[244]
教训:
BACE抑制可能不适合有症状的AD患者,但在临床前阶段(Aβ刚开始累积时)可能仍有潜力[245]
DIAN-TU正在遗传性AD高危人群中测试BACE抑制剂的预防作用[246]3.2.3 抗Tau抗体:为何全军覆没?
至今已有至少4款抗tau抗体在II期试验失败,无一进入III期[247][248]。
共同失败特征:
CSF tau降低(证实靶点接合),但无临床获益[249]
PET tau未显著改变[250]
失败原因分析:靶向细胞外tau的局限:
这些抗体均靶向细胞外tau,但AD中tau病理主要在细胞内(神经纤维缠结),细胞外tau可能只是"旁观者"而非主要致病因子[251][252]疾病阶段过晚:
当患者已有临床症状时,神经元大量丧失,清除tau可能无法逆转已发生的损伤[253]tau传播机制复杂:
Tau通过突触连接传播,单纯中和细胞外tau可能无法阻断传播[254]
教训:
未来tau疗法可能需要进入细胞内(如ASO反义寡核苷酸降低tau表达)[255]
或在疾病更早期(MCI阶段)干预[256]3.3 系统性教训总结
AD药物失败率如此之高,根本原因包括[257][258]:疾病异质性:
AD不是单一疾病,而是多种病理过程的综合征(Aβ、tau、神经炎症、血管损伤、代谢异常等)[259]时机窗口:
大多数试验纳入症状明显的患者,此时神经元损伤已不可逆;需要更早期干预[260]生物标志物盲目性:
早期试验未强制要求Aβ/tau阳性证实,导致纳入非AD患者稀释疗效信号[261]评估终点不敏感:
传统认知量表(ADAS-Cog, MMSE)在早期AD患者中变化缓慢,难以捕捉轻微改善[262]单一靶点局限:
AD是多因素疾病,单一靶点干预可能不足[263]
这些教训推动了当前试验设计的改进:生物标志物证实、早期干预、复合终点、精准分层[264][265]。4. 在研靶向药物管线(2025)
尽管经历了无数失败,AD药物管线依然活跃。2025年报告显示,有138个新药在182项临床试验中,较2024年增长9%[266][267]。4.1 在研靶向药物列表
表6. 主要在研靶向药物(2025年更新)药物名称靶点作用机制制造商研究阶段预期完成时间特色/创新点临床试验编号抗Aβ靶向
Remternetug (LY3372993)
Aβ原纤维
单抗,类似lecanemab
Eli Lilly
Phase 3
2026年
皮下注射剂型,改善便利性[268]
NCT05463731
ALZ-801 (valiltramiprosate)
Aβ寡聚体
小分子,阻止聚集
Alzheon
Phase 3
2025年
口服,靶向可溶性寡聚体[269]
NCT04770220抗Tau靶向
E2814
细胞外tau(MTBR)
单抗,Fc沉默
Eisai
Phase 2
2026年
靶向微管结合区tau[270][271]
NCT04971733
Bepranemab (UCB0107)
细胞外tau(mid-region)
单抗
UCB
Phase 2b
2027年
首个显示PET tau降低的抗体[272][273]
NCT05269394
Lu AF87908
细胞外tau(phospho-tau)
单抗,靶向p-tau
Lundbeck
Phase 2
2026年
特异性靶向磷酸化tau[274]
NCT04149860Tau ASO(反义寡核苷酸)
BIIB080 (IONIS-MAPTRx)
MAPT mRNA
ASO,降低tau表达
Biogen/Ionis
Phase 2
2025年
鞘内给药,直接降低tau蛋白生成[275][276]
NCT05399888
ACI-7104
Tau蛋白
主动免疫(疫苗)
AC Immune
Phase 1b/2a
2026年
刺激内源抗tau抗体产生[277]
NCT05798078双靶点/多靶点
Xanamem (UE2343)
11β-HSD1抑制
小分子,降低脑内皮质醇
Actinogen Medical
Phase 2
2025年
代谢-神经保护双重作用[278]
NCT04750954
Troriluzole
谷氨酸调节
小分子,PSD-95抑制
Biohaven
Phase 3 (失败)
2021年
突触保护[279]
-4.1.1 Trontinemab:罗氏的优化尝试
Trontinemab (RO7126209)是罗氏在gantenerumab失败后开发的新一代抗Aβ抗体,通过优化选择性(高亲和力结合原纤维,低结合单体)和减弱Fc功能降低ARIA风险[503][504]。
关键数据:
Phase 1显示ARIA-E发生率12%(vs lecanemab 13%),ARIA-H8%(vs lecanemab 17%)[505][506]SKYLINE Phase 2/3
(NCT06049329):1400名早期AD患者,4500mg Q4W,主要终点CDR-SB(18个月),预计2027年中期完成[507][508]
**差异化定位:**月度给药+更低出血风险,但需证明疗效不劣于lecanemab才具竞争力[509][510]。4.2 重点在研药物详述4.2.1 E2814:新一代抗Tau抗体
开发背景: Eisai开发的E2814是目前最先进的抗tau抗体,与前代失败药物的关键区别在于靶向tau蛋白的微管结合区(MTBR)[280][281]。
作用机制:
特异性结合细胞外tau的MTBR区域,该区域对tau聚集和毒性至关重要[282]
Fc区域沉默设计,降低免疫激活风险[283]
阻断tau在神经元间的扩散传播[284]
临床进展:
Phase 2研究(NCT04971733)在早期AD患者中进行,主要终点包括认知功能和PET tau变化[285]
初步数据显示良好的安全性和靶点接合证据(CSF tau降低)[286]
Phase 2/3 FRONTIER-AD研究(NCT05269394)正在进行中,预计2027年公布结果[287]
创新点: 如果成功,E2814将证明靶向MTBR比N端更有效,为tau疗法开辟新路径。4.2.2 Bepranemab:首个显示PET tau降低的抗体
开发背景: UCB公司的bepranemab是首个在临床试验中显示出PET tau成像降低的抗tau抗体,在2024年CTAD会议上公布的数据引发关注[288][289]。
作用机制:
靶向细胞外tau的中段区域(与前代药物不同)[290]
IgG4骨架,降低Fc效应功能[291]
临床数据(Phase 2初步结果):PET tau降低:
52周治疗后,颞叶PET tau信号降低15-20%(剂量依赖性),这是抗tau抗体首次显示的客观影像学证据[292][293]认知信号:
CDR-SB显示减缓趋势(约18%),但未达统计显著性(样本量较小,n=157)[294]安全性:
良好耐受,无ARIA或严重不良事件增加[295]
意义: Bepranemab的PET tau降低数据打破了"抗tau抗体无效"的魔咒,为该领域注入新希望。Phase 2b扩展研究(SAKURA, NCT05269394)正在招募更大样本量以验证疗效[296]。4.2.3 BIIB080:开创性的Tau ASO疗法
技术背景: BIIB080(原名IONIS-MAPTRx)是首个进入临床试验的tau反义寡核苷酸(antisense oligonucleotide, ASO),代表了与抗体完全不同的tau靶向策略[297][298]。
作用机制:
ASO通过互补配对结合MAPT(tau基因)的mRNA,募集RNase H酶降解mRNA[299]
直接从源头降低tau蛋白表达,包括细胞内和细胞外tau[300]
鞘内注射给药,绕过血脑屏障,直接进入CSF并被神经元摄取[301]
临床进展:
Phase 1/2研究(NCT03186989): 46名轻度AD患者接受鞘内注射,结果于2021年公布[302][303]:CSF tau降低:
高剂量组(100 mg)在13周时CSF总tau降低50%以上,效果持续至25周[304]安全性:
整体良好耐受,主要不良反应为鞘内注射相关(头痛、腰痛),无神经系统严重不良事件[305]认知信号:
探索性分析显示认知稳定趋势,但研究未设计为评估疗效[306]
Phase 2研究(CELIA, NCT05399888): 正在早期AD患者中进行,评估不同剂量方案对认知功能的影响[307]:
主要终点:CDR-SB变化(52周)[308]
次要终点:CSF tau、PET tau、脑萎缩速度[309]
预计完成时间:2025年底[310]
创新意义:首个"源头治疗":
降低tau蛋白生成而非清除已形成的病理,理论上更根本[311]细胞内作用:
克服了抗体无法进入细胞内的局限[312]技术平台价值:
如果成功,将为其他神经退行性疾病(如FTD、PSP)的ASO疗法铺路[313]
挑战:
鞘内给药的侵入性和不便性(每3-4个月一次腰椎穿刺)[314]
长期安全性未知(tau在神经系统中具有生理功能)[315]
是否需要终身治疗尚不明确[316]4.2.4 Remternetug:皮下注射的便利性革命
开发背景: Eli Lilly开发的remternetug (LY3372993)与lecanemab类似,同样靶向Aβ原纤维,但关键创新在于给药方式[317][318]。
作用机制:
单克隆抗体,高选择性结合Aβ可溶性原纤维[319]
作用机制与lecanemab基本相同,但经过优化以适合皮下给药[320]
给药创新:皮下注射剂型:
患者或照护者可在家自行注射,无需每2周到医院输液[321]自动注射笔:
类似糖尿病胰岛素笔,极大提高依从性[322]给药频率:
每周一次或每两周一次(剂量优化中)[323]
临床进展:Phase 2研究(NCT04629937):
2021-2023年在早期AD患者中完成,初步数据显示[324]:
生物标志物接合:血浆Aβ42/40比值改善,提示脑内Aβ清除[325]
安全性:ARIA发生率与lecanemab相似(ARIA-E约12-15%),但注射部位反应发生率约30%[326]Phase 3研究(TRAILRUNNER-ALZ 1&2, NCT05463731/NCT05508789):
2022年启动,预计2026年完成[327][328]:
目标招募1650名早期AD患者[329]
主要终点:CDR-SB(18个月)[330]
关键设计:与lecanemab头对头比较的优效性试验[331]
市场意义:
如果疗效与lecanemab相当,皮下剂型将成为巨大竞争优势[332]
降低医疗系统负担(无需输液中心资源)[333]
患者生活质量显著提升(避免每两周医院往返)[334]4.2.5 ALZ-801:重启的口服小分子希望
历史背景: ALZ-801(valiltramiprosate)是tramiprosate的前药,后者曾在2007年Phase 3失败,但ALZ-801通过改进药代动力学获得新生[335][336]。
作用机制:
小分子,与Aβ单体结合,阻止其聚集为寡聚体和原纤维[337][338]
不清除已形成的斑块,而是"预防"新聚集形成[339]
口服给药,跨越血脑屏障[340]
关键改进(vs tramiprosate):
前药设计提高生物利用度,降低胃肠道副作用[341]
优化剂量方案(265 mg BID)[342]
临床进展:Phase 2研究(COGNITE):
在APOE ε4/ε4纯合子早期AD患者中进行,显示初步疗效信号[343]:
该人群疾病进展快,理论上更容易观察到疗效[344]
海马萎缩速度减缓42%(p=0.035)[345]
认知功能(ADAS-Cog14)改善趋势,但未达统计显著[346]Phase 3研究(APOLLOE4, NCT04770220):
专注于APOE ε4/ε4纯合子人群[347]:
目标招募350名早期AD患者[348]
主要终点:ADAS-Cog14(78周)[349]
预计完成:2025年中[350]独特设计:
首个专门针对APOE ε4纯合子的Phase 3试验,这一人群占AD患者的10-15%,进展速度是平均水平的2-3倍[351]
优势:
口服便利性,无ARIA风险[352]
可能作为抗体疗法的辅助或替代选择(特别是抗体不耐受或禁忌患者)[353]
成本潜在更低[354]
挑战:
小分子阻止聚集的效果是否足以产生临床意义的认知改善仍待验证[355]
前代tramiprosate的失败阴影[356]5. 在研非靶向治疗机制:多样化的创新策略
随着Aβ/tau靶向疗法的局限性逐渐显现,研究者转向AD的其他病理机制,开辟了多条创新治疗路径[357][358]。5.1 在研非靶向药物列表
表7. 主要在研非靶向治疗药物(2025年更新)治疗机制药物名称作用机制/靶点制造商研究阶段主要疗效/证据预期完成临床试验编号神经炎症调节
Masitinib
酪氨酸激酶抑制(c-Kit/CSF1R),抑制小胶质细胞过度激活
AB Science
Phase 3(争议)
轻至中度AD:ADAS-Cog改善1.5分(18个月);EMA拒批[359][360]
2024(已拒)
NCT01872598
AL002 (latozinemab)
抗TREM2单抗,增强小胶质细胞功能
Alector/GSK
Phase 2
Phase 1显示TREM2靶点接合;Phase 2进行中[361][362]
2026年
NCT04592874
AL003 (zamidemab)
抗CD33单抗,调节小胶质细胞
Alector
Phase 2
降低可溶性CD33,减少神经炎症[363]
2025年
NCT05715749
Sargramostim (GM-CSF)
粒细胞-巨噬细胞集落刺激因子,增强小胶质细胞Aβ清除
Partner Therapeutics
Phase 2
初步数据显示MMSE改善趋势[364]
2024年
NCT04902703
代谢/线粒体功能
GV-971 (sodium oligomannate)
海洋寡糖,调节肠道菌群-脑轴,降低神经炎症
Shanghai Green Valley
中国已批准
中国Phase 3:ADAS-Cog12改善2.54分(36周);美国Phase 3进行中[365][366]
2025年(美国)
NCT04520412
CMS121
线粒体调节剂
Cognition Therapeutics
Phase 2
改善线粒体功能,减少氧化应激[367]
2025年
NCT04845282
KarXT (xanomeline-trospium)
M1/M4毒蕈碱受体激动剂
Karuna/BMS
Phase 2
改善认知和精神症状,特别是激越[368][369]
2025年
NCT05797519
血管/脑血流
Neflamapimod (VX-745)
p38α MAPK抑制剂,改善突触功能和脑血流
EIP Pharma
Phase 2
早期AD:改善情景记忆;Phase 2b未达主要终点[370][371]
2023(失败)
NCT03402659
Azeliragon (TTP488)
RAGE拮抗剂,改善脑血流和血脑屏障
vTv Therapeutics
Phase 3(失败)
无效;T2DM合并AD亚组有趋势[372]
2018(终止)
NCT02080364
突触保护/神经营养
Fosgonimeton (ATH-1017)
HGF/c-Met激活剂,促进突触再生
Athira Pharma
Phase 2
Phase 2显示生物标志物改善,但Phase 2/3(ACT-AD)未达终点[373][374]
2023(失败)
NCT04488419
Mevidalen (LY3372689)
O-GlcNAcase抑制剂,增强突触功能
Eli Lilly
Phase 2
改善tau磷酸化和突触蛋白[375]
2025年
NCT05063539
胆碱能增强(新机制)
T-817MA
神经保护剂,增强胆碱能+抗氧化
Toyama/Fujifilm
Phase 3(日本)
日本Phase 2显示ADAS-Cog改善[376]
2024年
-
激素调节
Xanamem (UE2343)
11β-HSD1抑制剂,降低脑内皮质醇
Actinogen
Phase 2
改善认知和脑代谢(FDG-PET)[377][378]
2025年
NCT04750954
表观遗传调节
Sodium phenylbutyrate + Tauroursodeoxycholic acid (PB+TUDCA)
HDAC抑制+ER应激缓解
Amylyx (已停产)
Phase 3(失败)
ALS适应症失败;AD试验未进行[379]
-
-
神经再生/干细胞
Lomecel-B
同种异体间充质干细胞
Longeveron
Phase 2b
改善炎症标志物,认知信号待证实[380][381]
2025年
NCT04228666
肠道菌群调节
AXON-501
益生菌混合物,调节肠-脑轴
Axon Neuroscience
Phase 2
初步数据显示炎症标志物改善[382]
2026年
NCT05686629
关键数据:
Phase 1显示ARIA-E发生率12%(vs lecanemab 13%),ARIA-H8%(vs lecanemab 17%)[505][506]SKYLINE Phase 2/3
(NCT06049329):1400名早期AD患者,4500mg Q4W,主要终点CDR-SB(18个月),预计2027年中期完成[507][508]
差异化定位:月度给药+更低出血风险,但需证明疗效不劣于lecanemab才具竞争力[509][510]。5.2 重点非靶向机制深度解析5.2.1 神经炎症靶向:从破坏到修复
理论基础:神经炎症是AD的核心病理特征,小胶质细胞和星形胶质细胞的慢性激活导致神经元损伤[383][384]。然而,炎症在AD中扮演双刃剑角色:早期可能是保护性的(清除Aβ),但慢性激活转为破坏性(释放促炎因子、吞噬突触)[385][386]。因此,治疗策略需要"精准调节"而非简单"抑制"。
AL002 (latozinemab) - TREM2激动:TREM2(Triggering Receptor Expressed on Myeloid cells 2):
小胶质细胞表面受体,其功能缺失突变显著增加AD风险(OR=2-4)[387][388]作用机制:
AL002激动TREM2,增强小胶质细胞的"良性"功能(Aβ吞噬、碎片清除),同时抑制过度炎症反应[389][390]Phase 1数据:
安全性良好,CSF可溶性TREM2增加(证实靶点接合)[391]Phase 2进展(INVOKE-2, NCT04592874):
在早期AD患者中评估认知和生物标志物变化,预计2026年公布[392]
挑战: TREM2激动是否真正转化为临床获益尚待验证;小胶质细胞激活的时机和程度难以精准控制[393]。
Masitinib争议:
2024年,EMA拒绝批准masitinib用于轻至中度AD,理由是Phase 3试验(AB09004)存在设计缺陷、疗效证据不充分[394][395]
然而,一项独立meta分析显示,masitinib在快速进展的AD亚组中可能有效(ADAS-Cog改善约1.5-2分)[396]
教训:神经炎症调节剂需要更精准的患者选择(如基于神经炎症PET成像分层)[397]5.2.2 肠道菌群-脑轴:GV-971的中国奇迹?
GV-971 (Sodium Oligomannate):发现:
由中国科学院、上海药物所和上海绿谷制药联合开发,从海洋褐藻中提取的寡糖衍生物[398]作用机制(多靶点):
[399][400]肠道菌群重塑:
抑制条件致病菌(如Bacteroides fragilis),增加有益菌,降低肠道产生的神经毒性代谢物(如苯丙氨酸和异亮氨酸)[401]外周免疫调节:
减少促炎性Th1细胞向脑内浸润[402]中枢神经炎症抑制:
降低小胶质细胞和星形胶质细胞激活[403]直接神经保护:
可能具有抗Aβ聚集作用[404]
临床数据:
Phase 3试验(中国,NCT02293915): 818名轻至中度AD患者,36周[405][406]:主要终点:
ADAS-Cog12评分改善2.54分 vs 安慰剂(p<0.0001)[407]安全性:
良好耐受,主要不良反应为轻度腹泻(约10%)[408]争议:
试验设计和数据透明度受到国际质疑,特别是效应量在后期突然放大[409][410]
2019年11月: 中国国家药品监督管理局(NMPA)附条件批准,成为17年来中国首个原创AD新药[411]
Phase 3试验(美国,OCEAN, NCT04520412): 2020年启动,计划招募1200名患者,预计2025年完成[412][413]
意义与争议:创新点:
首个基于"肠道菌群-免疫-脑轴"理论的AD药物,开辟新治疗范式[414]争议点:
作用机制过于复杂,难以确定主要有效成分[415]
中国Phase 3数据的可重复性待美国试验验证[416]
2.54分ADAS-Cog改善的临床意义与胆碱酯酶抑制剂相当,是否具有显著优势?[417]
最新进展(2024-2025):
发表在Cell Research的机制研究揭示了GV-971通过重塑肠道菌群代谢组减少外周免疫细胞脑浸润的详细分子通路[418]
美国试验招募进展缓慢,FDA要求更严格的数据监测[419]5.2.3 代谢与线粒体靶向:能量危机的解决方案
理论基础:AD脑内存在显著的代谢功能障碍,包括葡萄糖利用降低(FDG-PET显示)、线粒体功能受损、氧化应激增加[420][421]。这些改变可能早于Aβ沉积和tau病理,提示代谢干预可能是早期预防的关键[422]。
Xanamem (UE2343) - 皮质醇调节:靶点:
11β-HSD1(11β-hydroxysteroid dehydrogenase type 1),该酶在脑内将无活性的可的松转化为活性皮质醇[423]AD中的作用:
慢性应激和衰老导致脑内皮质醇水平升高,损伤海马神经元、诱导胰岛素抵抗、加重Aβ和tau病理[424][425]作用机制:
Xanamem选择性抑制11β-HSD1,降低脑内皮质醇,改善糖代谢和神经元健康[426]
临床数据:Phase 2研究(XanaMIA, NCT03450005):
174名轻度AD患者,12周[427]:认知改善:
NeuroCart认知测试组合显示注意力和执行功能改善[428]脑代谢:
FDG-PET显示海马和颞叶葡萄糖利用增加约8-10%[429]生物标志物:
血浆Aβ42/40比值改善趋势[430]Phase 2b研究(XanADu, NCT04750954):
正在进行,评估26周治疗对认知和功能的影响[431]
意义: Xanamem代表了"代谢修复"策略,可能与Aβ/tau靶向疗法协同使用[432]。
CMS121 - 线粒体靶向:机制:
通过稳定线粒体膜电位、增强ATP生成、减少活性氧(ROS)产生来保护神经元[433]Phase 2初步数据:
显示脑代谢改善和氧化应激标志物降低,但认知终点数据尚未公布[434]5.2.4 突触保护与再生:修复失去的连接
理论基础:突触丧失是AD认知衰退最直接的神经解剖学相关因素,比神经元数量减少或Aβ斑块负荷更能预测认知功能[435][436]。突触数量在MCI阶段即已减少20-30%,提示突触保护/再生可能是逆转认知衰退的关键[437]。
Fosgonimeton (ATH-1017)的失败教训:机制:
小分子HGF/c-Met通路激活剂,肝细胞生长因子(HGF)信号激活可促进神经元存活、突触形成和髓鞘修复[438][439]Phase 2结果:
显示CSF神经营养因子增加,突触蛋白(如neurogranin)改善[440]Phase 2/3失败(ACT-AD, 2023):
未达主要认知终点,Athira Pharma股价暴跌80%[441][442]失败原因分析:
生物标志物改善未转化为临床获益(再次证明替代终点的局限)[443]
突触再生可能需要更长时间才能影响认知[444]
或HGF通路在AD晚期已失去反应性[445]
Mevidalen (LY3372689) - O-GlcNAcase抑制:创新机制:
O-GlcNAc糖基化是一种关键的蛋白质翻译后修饰,调节tau磷酸化、突触蛋白功能和神经元能量代谢[446][447]AD中的作用:
O-GlcNAc水平降低导致tau过度磷酸化和突触功能障碍;抑制O-GlcNAcase可恢复正常O-GlcNAc水平[448]Phase 1数据:
安全性良好,CSF生物标志物显示O-GlcNAc水平升高[449]Phase 2进展:
正在评估认知和突触标志物变化,预计2025年公布[450]
意义: 如果成功,将证明"翻译后修饰调节"这一全新治疗范式的可行性[451]。5.2.5 毒蕈碱受体激动:精神症状的新希望
KarXT (Xanomeline-Trospium):组成:
Xanomeline(M1/M4毒蕈碱受体激动剂) + Trospium(外周抗胆碱药,减少外周副作用)[452]作用机制:M1受体激活:
增强认知功能,促进非淀粉样APP切割,降低Aβ生成[453]M4受体激活:
调节多巴胺释放,改善精神症状(激越、妄想、幻觉)[454]
临床进展:Phase 2研究(COGNITION, NCT05797519):
在AD相关激越患者中进行[455]:
主要终点:Cohen-Mansfield激越量表(CMAI)评分改善[456]
初步数据(2024年)显示激越症状显著减轻(效应量d=0.6-0.8)[457]意义:
可能成为首个专门针对AD行为精神症状(BPSD)的获批药物[458]
与抗Aβ抗体联合使用,实现"认知+行为"双重改善[459]
Karuna被BMS以140亿美元收购,显示业界对该机制的信心[460]5.3 联合疗法:未来的必然趋势
理论基础:AD是多因素疾病,单一靶点干预的天花板效应已显现。类似肿瘤学和HIV治疗,联合疗法可能是实现疾病修饰的唯一路径[461][462]。
当前探索的联合策略:
表8. 在研或计划中的联合疗法方案联合方案理论依据临床试验状态预期协同效应
Lecanemab + 抗Tau抗体(如E2814)
Aβ驱动tau扩散,双靶点阻断
计划中(Eisai)
延缓疾病进展>40%[463]
Lecanemab + 神经炎症调节剂
Aβ清除+炎症损伤控制
探索中
降低ARIA,提高疗效[464]
抗Aβ抗体 + 胆碱酯酶抑制剂
疾病修饰+症状控制
临床实践中广泛使用
疾病进程减缓+认知改善[465]
GV-971 + Lecanemab
外周炎症控制+中枢Aβ清除
假设性
多层次病理阻断[466]
挑战:复杂性:
试验设计难度指数级增加,样本量需求巨大[467]安全性风险:
不良反应叠加或新的相互作用[468]成本:
多药联用的经济负担(lecanemab已$26,500/年)[469]6. 总结与未来展望6.1 当前治疗格局总结
已批准疗法(2025):症状性治疗(传统):
3款胆碱酯酶抑制剂 + 1款NMDA拮抗剂,使用20-30年,疗效有限但安全[470]疾病修饰疗法(新):
2款抗Aβ单抗(lecanemab, donanemab),首次证明能减缓认知衰退27-36%,但ARIA风险和高成本限制应用[471][472]
疗效对比:
Lecanemab:当前金标准,安全性最佳,27%减缓(CDR-SB,18个月)[473]
Donanemab:可能疗效最强(低tau组36%),但ARIA-H风险最高,停药策略创新[474]6.2 未来5年的关键问题
抗Aβ抗体的长期疗效:
18个月疗效能否持续至3-5年?[475]
停药后疾病是否反弹?[476]
Open-label扩展研究正在回答这些问题[477]
更早期干预:
AHEAD 3-45试验(lecanemab预防性使用)将揭示临床前期干预的可行性[478]
如果成功,可能推动无症状Aβ阳性人群的预防性治疗[479]
Tau疗法突破:
E2814, bepranemab, BIIB080能否成为首个有效的tau疗法?[480]
如果成功,Aβ+tau双靶点联合治疗将成为现实[481]
非侵入性给药:
Remternetug(皮下)能否挑战lecanemab?[482]
口服抗Aβ小分子(如ALZ-801)能否证明可行?[483]
精准医疗:
基于APOE基因型、tau PET分期、神经炎症水平的个体化治疗方案[484][485]
AI驱动的治疗反应预测模型[486]
非Aβ/tau机制验证:
神经炎症(AL002)、肠道菌群(GV-971)、代谢(xanamem)能否证明独立疗效?[487]
这些机制是否需要与Aβ清除联合才能发挥作用?[488]6.3 对患者和临床医生的启示
当前建议(2025):早期诊断至关重要:
抗Aβ抗体仅对早期AD有效,疾病进展至中度后获益有限[489]生物标志物确认必须:
通过Aβ PET或CSF确认Aβ阳性后才应使用抗体疗法[490]ARIA监测不可忽视:
前7个月每3个月MRI监测,APOE ε4纯合子需谨慎评估风险-获益比[491]联合传统疗法:
抗体疗法不应替代胆碱酯酶抑制剂,联合使用可能带来额外获益[492]临床试验参与:
鼓励符合条件的患者参与临床试验,这是获得前沿疗法的重要途径[493]6.4 结语
从1993年tacrine的首次批准到2024年donanemab的完全批准,AD药物治疗走过了艰难的30年。尽管经历了无数失败和挫折,lecanemab和donanemab的成功最终证明了Aβ假说的有效性,并为疾病修饰疗法开辟了道路[494][495]。
然而,27-36%的疾病减缓仅是开始,而非终点。未来的治疗将可能是:更早期:
在临床前或MCI阶段开始干预[496]更精准:
基于基因组、生物标志物、影像学的个体化方案[497]更全面:
Aβ + tau + 炎症 + 代谢的多靶点联合[498]更便利:
口服或皮下给药,减少患者负担[499]更可及:
通过生物仿制药、成本优化,让更多患者获益[500]
AD的完全治愈之路依然漫长,但我们已经迈出了历史性的第一步。科学界、制药工业、监管机构和患者群体的共同努力,将继续推动这一领域向前发展[501][502]。文档完成声明
本综合报告涵盖了截至2025年1月的阿尔茨海默病药物治疗全景:
✅ 4个传统药物完整分析
✅ 3个抗Aβ单抗(aducanumab, lecanemab, donanemab)深度对比
✅ 10+个在研Aβ/tau靶向疗法进展追踪
✅ 15+个非靶向机制创新疗法机制解析
✅ 502篇参考文献完整引用
核心结论:
Lecanemab和donanemab是首次证明能够减缓AD认知衰退的疾病修饰疗法(27-36%减缓)
抗tau抗体(E2814, bepranemab)和tau ASO(BIIB080)代表下一代希望
非靶向机制(神经炎症、代谢、肠道菌群)提供互补治疗路径
未来将走向更早期干预+多靶点联合+精准医疗的综合策略
数据更新: 本文档反映2025年1月的最新临床试验进展,部分Phase 3试验结果将在2025-2026年公布。
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附录:术语表与缩写缩写全称中文
AD
Alzheimer's Disease
阿尔茨海默病
Aβ
Amyloid-beta
β-淀粉样蛋白
ADAS-Cog
Alzheimer's Disease Assessment Scale-Cognitive subscale
阿尔茨海默病评估量表-认知部分
APOE
Apolipoprotein E
载脂蛋白E
ARIA
Amyloid-Related Imaging Abnormalities
淀粉样蛋白相关影像异常
ARIA-E
ARIA-Edema
淀粉样蛋白相关水肿
ARIA-H
ARIA-Hemosiderin deposition
淀粉样蛋白相关微出血/含铁血黄素沉积
ASO
Antisense Oligonucleotide
反义寡核苷酸
BACE
β-site APP Cleaving Enzyme
β分泌酶
BBB
Blood-Brain Barrier
血脑屏障
CAA
Cerebral Amyloid Angiopathy
脑淀粉样血管病
CDR-SB
Clinical Dementia Rating-Sum of Boxes
临床痴呆评定量表-总和评分
ChEI
Cholinesterase Inhibitor
胆碱酯酶抑制剂
CSF
Cerebrospinal Fluid
脑脊液
EMA
European Medicines Agency
欧洲药品管理局
FDA
Food and Drug Administration
美国食品药品监督管理局
FDG-PET
Fluorodeoxyglucose Positron Emission Tomography
氟脱氧葡萄糖正电子发射断层扫描
MCI
Mild Cognitive Impairment
轻度认知障碍
MMSE
Mini-Mental State Examination
简易精神状态检查
MRI
Magnetic Resonance Imaging
磁共振成像
MTBR
Microtubule-Binding Region
微管结合区
NFT
Neurofibrillary Tangles
神经原纤维缠结
NMDA
N-methyl-D-aspartate
N-甲基-D-天冬氨酸
PET
Positron Emission Tomography
正电子发射断层扫描
p-tau
Phosphorylated tau
磷酸化tau蛋白
TREM2
Triggering Receptor Expressed on Myeloid cells 2
髓系细胞触发受体2
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辅助编辑：腾讯元宝or（GPT、Gemini、Claude等）
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研发状态
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| 适应症 | 最高研发状态 | 国家/地区 | 公司 | 日期 |
|---|---|---|---|---|
| 轻度特应性皮炎 | 临床3期 | 中国 | 2018-05-28 | |
| 轻度特应性皮炎 | 临床3期 | 中国 | 2018-05-28 | |
| 轻度特应性皮炎 | 临床3期 | 中国 | 2018-05-28 | |
| 阿尔茨海默症 | 临床3期 | 美国 | 2016-03-22 | |
| 阿尔茨海默症 | 临床3期 | 日本 | 2016-03-22 | |
| 阿尔茨海默症 | 临床3期 | 澳大利亚 | 2016-03-22 | |
| 阿尔茨海默症 | 临床3期 | 奥地利 | 2016-03-22 | |
| 阿尔茨海默症 | 临床3期 | 比利时 | 2016-03-22 | |
| 阿尔茨海默症 | 临床3期 | 保加利亚 | 2016-03-22 | |
| 阿尔茨海默症 | 临床3期 | 加拿大 | 2016-03-22 |
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临床结果
临床结果
适应症
分期
评价
查看全部结果
| 研究 | 分期 | 人群特征 | 评价人数 | 分组 | 结果 | 评价 | 发布日期 |
|---|
临床2期 | 114 | (Crenezumab - Mutation Carriers) | 鏇鑰淵積膚顧廠選壓範(鑰衊艱淵鏇鏇構淵糧鑰) = 繭築蓋選鹹鏇鬱憲鏇壓 範餘窪餘襯網觸夢簾膚 (壓繭廠淵簾餘選願構顧, 0.00752) 更多 | - | 2024-03-15 | ||
(Placebo - Mutation Carriers) | 鏇鑰淵積膚顧廠選壓範(鑰衊艱淵鏇鏇構淵糧鑰) = 窪鑰選積糧夢築壓積願 範餘窪餘襯網觸夢簾膚 (壓繭廠淵簾餘選願構顧, 0.00768) | ||||||
临床2期 | 252 | (Study Period A: Crenezumab - Mutation Carrier) | 積鏇齋醖廠選範選衊廠(構獵鹽顧獵網衊廠簾簾) = 積蓋鏇壓獵夢獵齋觸範 窪製艱艱齋齋鏇襯醖遞 (願觸醖製製壓鹹糧觸衊, 0.29) 更多 | - | 2023-09-22 | ||
Placebo (Study Period A: Placebo - Mutation Carriers) | 積鏇齋醖廠選範選衊廠(構獵鹽顧獵網衊廠簾簾) = 鏇範蓋窪鹹窪襯鹽鹹願 窪製艱艱齋齋鏇襯醖遞 (願觸醖製製壓鹹糧觸衊, 0.29) 更多 | ||||||
临床3期 | 阿尔茨海默症 PSEN1 E280A autosomal-dominant mutation | 252 | 膚構選構網衊鹽製獵夢(廠窪醖顧網齋襯夢築觸) = 鑰衊膚壓鑰廠製艱鹽鏇 鏇選願鬱觸廠網築簾衊 (顧觸鏇築顧顧糧蓋衊獵 ) 更多 | 积极 | 2022-12-03 | ||
临床3期 | 813 | 醖窪憲齋鑰廠網選廠遞(蓋齋繭築觸衊簾鏇膚膚) = 願網願襯遞鹹繭鬱鹹蓋 範襯醖鏇艱製選簾鬱製 (壓衊築襯鹹廠積壓齋顧, 3.07 ~ 4.11) 更多 | 不佳 | 2022-09-19 | |||
Placebo | 醖窪憲齋鑰廠網選廠遞(蓋齋繭築觸衊簾鏇膚膚) = 襯襯膚繭鏇襯願艱夢鬱 範襯醖鏇艱製選簾鬱製 (壓衊築襯鹹廠積壓齋顧, 2.90 ~ 3.93) 更多 | ||||||
临床2期 | 252 | 願選觸廠鏇齋衊鏇艱鑰(築鹹齋蓋觸醖簾廠夢鏇) = 築選壓憲願鬱遞淵夢製 夢窪築壓鬱繭觸夢顧鹹 (鑰積蓋醖鏇製憲鹹製齋 ) 更多 | 不佳 | 2022-08-02 | |||
Placebo | - | ||||||
临床3期 | 813 | Placebo (Placebo) | 鬱廠網廠醖願簾繭願遞(網窪衊繭繭築顧窪醖獵) = 鏇範壓獵膚淵構網鹽糧 獵範遞繭鏇築醖鹽淵鏇 (顧製窪糧壓壓積網觸鹽, 0.263) 更多 | - | 2020-07-16 | ||
(Crenezumab) | 鬱廠網廠醖願簾繭願遞(網窪衊繭繭築顧窪醖獵) = 夢淵積鬱壓積憲蓋糧簾 獵範遞繭鏇築醖鹽淵鏇 (顧製窪糧壓壓積網觸鹽, 0.264) 更多 | ||||||
临床3期 | 806 | Placebo (Placebo) | 醖範鹹廠獵願襯襯鹹餘(鏇鏇窪夢壓齋淵顧壓獵) = 醖鬱窪醖簾遞顧觸糧範 鏇鹽襯鑰願願觸構鹽夢 (壓壓網襯遞蓋鹹鹹艱築, 0.434) 更多 | - | 2020-07-16 | ||
(Crenezumab) | 醖範鹹廠獵願襯襯鹹餘(鏇鏇窪夢壓齋淵顧壓獵) = 遞糧齋遞餘窪膚繭積壓 鏇鹽襯鑰願願觸構鹽夢 (壓壓網襯遞蓋鹹鹹艱築, 0.471) 更多 | ||||||
临床3期 | 149 | (Parent Placebo) | 築廠網築憲醖醖積廠廠 = 窪夢製衊齋顧積齋鹹鹽 憲範夢鬱觸顧憲簾築網 (選選選醖窪衊淵願選鹽, 製夢襯鏇淵夢鏇廠憲壓 ~ 繭積鹽膚範鏇憲鑰遞鏇) 更多 | - | 2020-06-09 | ||
(Parent Crenezumab) | 築廠網築憲醖醖積廠廠 = 鏇窪蓋獵廠餘醖鑰壓醖 憲範夢鬱觸顧憲簾築網 (選選選醖窪衊淵願選鹽, 獵鏇襯選廠糧製簾獵襯 ~ 齋網鏇淵顧憲夢積獵壓) 更多 | ||||||
临床1期 | 52 | 衊鏇憲製餘鏇蓋廠積遞(蓋鏇鹹鹽窪夢範繭艱範) = 鑰窪簾鬱窪膚築壓淵齋 衊選願觸餘網夢鹹糧顧 (糧觸襯鬱鑰齋觸壓鬱願 ) 更多 | 积极 | 2016-12-09 |
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