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bioRxiv · 10.64898/2026.07.02.736062

PredHLM: quantitative and interpretable prediction of metabolic half-life in human liver microsomes

Jang, J.·Cho, N.-C.·Oh, K.-S.
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Abstract

MotivationHuman liver microsome (HLM)-based metabolic stability assays are fundamental in early drug discovery, shaping pharmacokinetic profiles and oral bioavailability. However, these experimental assays are labor-intensive and time-consuming, limiting their application in large-scale virtual screening. Computational models can prioritize compounds at scale, yet most are classification-based, leaving quantitative and interpretable prediction of HLM half-life limited. ResultsIn this study, we developed a quantitative machine learning model for the direct prediction of HLM half-life (T1/2) by integrating 11,790 compounds combining in-house and curated public data. Among various combinations of molecular features and learning algorithms, the XGBoost model with RDKit 2D descriptors achieved the best predictive performance, with an RMSE of 0.507 and an R2 of 0.431 on an independent test set. Shapley Additive Explanations (SHAP) analysis identified lipophilicity and known metabolic soft-spot features as the primary contributors to the predictions. These results suggest that this quantitative approach provides a practical framework for defining metabolic stability margins, thereby supporting rapid Go/No-go decisions in preclinical drug discovery. AvailabilityThe source code, data, and trained model are available at https://github.com/joshua-416/PredHLM. Graphical abstract O_FIG O_LINKSMALLFIG WIDTH=200 HEIGHT=77 SRC="FIGDIR/small/736062v1_ufig1.gif" ALT="Figure 1"> View larger version (17K): org.highwire.dtl.DTLVardef@7d94c1org.highwire.dtl.DTLVardef@b13e71org.highwire.dtl.DTLVardef@7aa684org.highwire.dtl.DTLVardef@4a2668_HPS_FORMAT_FIGEXP M_FIG C_FIG

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Jang, J., Cho, N.-C., Oh, K.-S.. 2026-07-08. PredHLM: quantitative and interpretable prediction of metabolic half-life in human liver microsomes. https://doi.org/10.64898/2026.07.02.736062

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