acedeep learning models predicting conversion from mild cognitive impairment to Alzheimer's disease
Source article: Predicting Conversion from Mild Cognitive Impairment to Alzheimer's Disease: A Systematic Review of Deep Learning Models for Early-Stage Disease Classification
Abstract: Introduction Alzheimer's disease (AD) is a progressive neurodegenerative disorder for which early diagnosis-particularly the accurate prediction of conversion from mild cognitive impairment (MCI) to AD-is essential to enable timely and effective therapeutic interventions. Deep learning (DL) models have demonstrated substantial promise in this domain; however, critical challenges persist, including multiclass staging of disease progression, longitudinal data modeling, and effective multimodal data integration. Th…
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This PRISMA-guided systematic review examined 60 studies published between 2019 and February 2026 that used deep learning to classify Alzheimer's stages and predict conversion from mild cognitive impairment to Alzheimer's disease. It found cross-sectional designs predominant, CNNs dominant for neuroimaging, and growing use of RNNs and transformers for longitudinal data, with multimodal approaches in 24 studies.
The findings matter because accurate early prediction of MCI-to-AD conversion is essential for timely intervention, yet the review shows current models are not ready for routine care. As of the September 2026 publication date, strong reported accuracies coexist with unresolved generalizability, validation heterogeneity, and interpretability gaps that must be addressed before clinical deployment.
- Review included 60 studies from PubMed, Scopus, IEEE Xplore, and Web of Science between January 1, 2019 and February 20, 2026.
- Cross-sectional approaches dominated with 47 studies versus 13 longitudinal studies.
- 42 of 60 studies relied on the ADNI dataset, limiting generalizability.
- CNNs dominated neuroimaging modeling with 21 studies, while RNNs and transformers each appeared in 4 studies for longitudinal dependencies.
Deep learning models showed promising and often strong performance for predicting conversion from mild cognitive impairment to Alzheimer's disease, supporting early diagnosis and timely therapeutic intervention.
Deep learning models for MCI-to-AD conversion face substantial barriers to routine clinical use due to heavy reliance on ADNI, lack of diverse multicenter data, overfitting, and poor interpretability.
The rundown
The review screened literature from 2019 to February 2026 and synthesized 60 studies on DL for AD staging and MCI-to-AD conversion, extracting study design, datasets, modalities, architectures, and tasks.
Binary pMCI vs sMCI classification was the most challenging task with accuracy ranging 71.71-96.3%, and performance declined as class number increased in multiclass settings.
Authors call for greater emphasis on longitudinal analysis, intelligent multimodal fusion, interpretable architectures, diverse multicenter datasets, and personalized time-to-event models.
Findings are constrained by heavy reliance on a single dataset, methodological heterogeneity preventing direct comparison, and common issues of overfitting and poor interpretability.
Sources
- Peer-reviewedAgeing Research Reviews2026-09-11
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