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Lecanemab and donanemab slow Alzheimer’s decline, but is the benefit worth the cost?

February 17, 2025
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New analysis reveals that lecanemab and donanemab can gradual cognitive decline and prolong sufferers’ independence in each day actions. However with excessive prices and dangers, are these therapies really significant for Alzheimer’s sufferers and their households?

Examine: Assessing the scientific meaningfulness of slowing CDR-SB development with disease-modifying therapies for Alzheimer’s illness. Picture Credit score: Shutterstock AI Generator / Shutterstock.com

A latest Alzheimer’s and Dementia research explores the results of remedy on the time sufferers with Alzheimer’s illness (AD) spend remaining unbiased in primary actions of each day residing (BADLs) and instrumental actions of each day residing (IADLs).

Present therapies for AD

AD is a neurodegenerative dysfunction characterised by cerebral accumulation of amyloid and tau pathology, inflicting synaptic and neuronal damage resulting in progressive dementia. A number of therapies, together with anti-amyloid monoclonal antibodies, have been developed to scale back cerebral amyloid burden which will delay AD development.

In July 2023, america Meals and Drug Administration (FDA) authorized lecanemab as a disease-modifying remedy (DMT) to fight early symptomatic AD. Quickly thereafter, in July 2024, donanemab was additionally authorized. Nevertheless, in some circumstances, each therapies have been related to minimal scientific relevance in slowing dementia development.

Each lecanemab and donanemab are pricey therapies which will enhance the chance of amyloid-related neuroimaging abnormalities (ARIA). In consequence, some physicians are reluctant to provoke these therapies, as any remedy must reveal scientific significance to outweigh the potential dangers and prices.

Assessing AD severity

Scientific Dementia Score (CDR) is a world scale used to find out dementia standing and its severity by measuring the extent of cognitive loss in numerous domains. These domains embrace reminiscence, judgment, orientation, and problem-solving, together with purposeful expertise in group affairs, residence, and private care.

Every CDR area is rated from zero to a few, reflecting wholesome and severely impaired cognition. The summation of the scores of the person CDR domains or “containers” yields the CDR-Sum of Packing containers (CDR-SB), a steady measure with scores starting from zero to 18.

Though there isn’t a clear consensus on a ‘clinically significant’ profit for AD dementia, cognition and performance efficiency should be assessed to know the advantages of AD remedy. Scientific advantages defined by way of statistical significance don’t all the time assist caregivers or relations perceive remedy outcomes. In consequence, different metrics like IADLs and BADLs can be utilized to quantify purposeful independence in AD sufferers.

In regards to the research

The present longitudinal research was carried out on the Knight Alzheimer Illness Analysis Heart (KnightADRC) at Washington College. Each cognitively unimpaired and cognitively impaired community-living individuals who agreed to bear amyloid positron emission tomography (PET) and lumbar puncture (LP) had been included within the evaluation. All research individuals additionally supplied cerebrospinal fluid (CSF) samples for amyloid beta (Aβ) and tau protein evaluation.

All individuals underwent scientific and cognitive assessments to acquire the CDR rating. Primarily based on normal standards and a world CDR rating, a scientific prognosis of AD dementia was decided.

Examine findings

This research included 282 individuals, 67% of whom had very delicate AD dementia and 33% with delicate AD dementia, which was scored with a CDR of 1. About 56% of the research cohort had been male, 88% had been non-Hispanic White, and 10% had been Black or African American.

Most CDR 0.5 individuals had been unbiased, whereas solely 40% of CDR 1 individuals had been unbiased. At baseline, practically all individuals had been unbiased in BADLs.

4 IADL parts had been thought of features of the CDR-SB rating, enabling the estimation of the extent of independence. These parts included paying payments, driving, remembering medicines/appointments, and meal preparation.

Primarily based on this strategy, roughly 50% of research individuals had been dependent. Some individuals may independently put together their meals and keep in mind appointments/remedy at a better CDR-SB rating however did not pay payments and drive effectively.

A powerful relationship between CDR and ADLs was noticed. Roughly 93% of individuals with CDR-SB of lower than 4.5 had been unbiased in IADLs, whereas 87% of individuals with CDR-SB of over 4.5 didn’t have independence in IADLs.

Furthermore, 97% of individuals with CDR-SB lower than 11.5 had been unbiased in BADLs. Comparatively, 85% of individuals with CDR-SB exceeding 11.5 didn’t exhibit independence in BADLs.

The typical annual CDR-SB enhance was 1.30. Nevertheless, when this metric was modeled as a operate of baseline CDR, the CDR-SB elevated by 1.05 yearly for people with CDR 0.5 and one at baseline. Total, a linear enhance in CDR-SB was noticed over time.

The anticipated time to lose independence in IADLs was about 29 months. Curiously, the extra years of independence in IADLs and BADLs correlated with lecanemab or donanemab therapies, which might be on account of a slower price of decline in CDR-SB.

Assuming a constant lower within the price of CDR-SB rating after remedy, an extra 10 and eight months of independence in IADLs had been related to lecanemab and donanemab therapies, respectively. For donanemab remedy, an extra 13 months of independence in IADLs was noticed for the low/medium tau PET group, whereas 4 months of independence in IADLs was measured for the excessive tau PET.

Conclusions

The present research gives new insights into the connection between CDR-SB scores and purposeful independence. These findings additionally spotlight the scientific meaningfulness of AD therapies and whether or not sufferers and their households could make extra knowledgeable remedy selections.

Journal reference:

Hartz, M. S., Schindler, S. E., Streitz, M. L., et al. (2025) Assessing the scientific meaningfulness of slowing CDR-SB development with disease-modifying therapies for Alzheimer’s illness. Alzheimer’s and Dementia 11. doi:10.1002/trc2.70033



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Tags: AlzheimersBenefitCostDeclinedonanemabLecanemabSlowWorth
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