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Modifying Hy's Law and eDISH for the modern idiosyncratic DILI era.

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|October 25, 2025
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Summary

Hy's Law, a biomarker for drug-induced liver injury (DILI), requires updates due to new drug classes and DILI phenotypes. Current definitions are being re-evaluated for broader applicability in hepatotoxicity assessment.

Keywords:
DILI prognosisHy’s LawSankey plotsdrug-induced liver injuryeDISH

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Area of Science:

  • Hepatology and drug-induced liver injury (DILI) research.
  • Pharmacovigilance and regulatory science.

Background:

  • Hy's Law, established by Dr. Hyman Zimmerman, identifies hepatocellular jaundice as a marker for severe drug-induced liver injury (DILI).
  • The FDA currently defines Hy's Law using specific elevations in ALT/AST and total bilirubin, excluding cholestasis and other causes.
  • Modern DILI cases present challenges to the universal application of the existing Hy's Law definition.

Purpose of the Study:

  • To review proposed updates and modifications to the existing Hy's Law definition.
  • To explore new methodologies for assessing drug-induced liver injury (DILI) and hepatotoxicity.
  • To discuss the evolving landscape of DILI assessment in light of new drug classes and phenotypes.

Main Methods:

  • Review of existing literature and studies on Hy's Law modifications.
  • Analysis of proposed new metrics, such as the R value for hepatocellular injury.
  • Examination of emerging FDA research and visualization tools like Sankey and eDISH plots.

Main Results:

  • Several practical modifications to Hy's Law have been proposed.
  • New metrics and visualization techniques are being developed to refine DILI assessment.
  • The original 2009 Hy's Law guidance is still in use but facing pressure for updates.

Conclusions:

  • Proposed modifications to Hy's Law are likely to be adopted into future FDA recommendations.
  • These updates aim to improve the assessment of drug hepatotoxicity in the evolving DILI landscape.
  • The evolution of Hy's Law reflects advancements in understanding and managing DILI.