Application of elastic net for clinical outcome prediction and classification in progressive supranuclear palsy: A...

Previous studies have used machine learning to identify clinically relevant atrophic regions in progressive supranuclear palsy (PSP). This study applied Elastic Net (EN) in PSP to uncover key atrophic patterns, offering a novel approach to understanding its pathology.

This study included baseline data from 74 patients with PSP enrolled in the Study of Comprehensive ANd multimodal marker-based cohort of PSP (SCAN-PSP, NCT05579301) in Seoul between January 2022 and August 2023. Participants were evaluated with PSP-rating scale (PSPRS) and Schwab & England Activity of daily living (SEADL). EN regression was used to identify regions with high explanatory power for clinical outcomes, which were combined with clinical parameters to build prediction models. Features selected from EN classification were applied to discriminate between the two groups.

EN identified the third ventricle, right anterior cingulate cortex, and left lateral orbitofrontal cortex as significant features, and multivariate linear regression models incorporating these regions with clinical variables showed high explainability for PSPRS (adjusted R² = 0.62) and SEADL (adjusted R² = 0.74). The EN-predicted values demonstrated strong correlation with actual scores of PSPRS (r = 0.75, p = 2·10^-14) and SEADL (r = 0.82, p = 2·10^-19). The combined EN-selected features and clinical parameters model robustly distinguished PSP-Richardson from the subcortical types (AUC = 0.94) and those with severe downgaze palsy from without (AUC = 0.90).

This study demonstrated that EN effectively identified significant regional atrophies in PSP, with a modest sample size. Future studies could incorporate multimodal analysis to identify markers for monitoring disease progression.