Liver Injury in Immune Stevens-Johnson Syndrome and Toxic Epidermal Necrolysis: Five New Classification Types

Area of Science:

• Dermatology
• Hepatology
• Pharmacovigilance

Background:

• Liver injury is a complex complication of Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN).
• Causes are diverse, including drugs, heavy metals, infections, and radiation, leading to diagnostic challenges.
• SJS/TEN represents a spectrum of immune-mediated disorders, with TEN being the most severe form.

Purpose of the Study:

• To analyze diagnostic algorithms for causality assessment in SJS/TEN liver injury.
• To characterize different types of SJS/TEN liver injury based on etiology and diagnostic methods.
• To propose a new typology for SJS/TEN to enhance homogeneity and understanding.

Main Methods:

• Extensive literature search for case reports, cohorts, and reviews.
• Inclusion of search terms: Stevens-Johnson Syndrome, Toxic Epidermal Necrolysis, Roussel Uclaf Causality Assessment Method (RUCAM), and Algorithm of Drug Causality for Epidermal Necrolysis (ALDEN).
• Development of a five-type SJS/TEN typology based on culprit (drug/non-drug/unknown) and assessment tools (ALDEN/RUCAM/other).

Main Results:

• SJS/TEN liver injury lacks cohort homogeneity due to varied causes and diagnostic approaches.
• A new five-type typology for SJS/TEN is proposed: Type 1 (drug, ALDEN & RUCAM), Type 2 (drug, ALDEN only), Type 3 (drug, other tools), Type 4 (non-drug), Type 5 (unknown).
• This typology aims to standardize classification and improve characterization of SJS/TEN liver injury.

Conclusions:

• The proposed SJS/TEN typology addresses issues of inhomogeneity in liver injury classification.
• This new classification facilitates better individual feature characterization and personalized treatment strategies.
• Clarifying pathogenetic specifics for each of the five disease types is a key outcome.