Prognostic tools for hypertrophic scar formation based on fundamental differences in systemic immunity

Area of Science:

• Immunology
• Dermatology
• Surgical Pathology

Background:

• Hypertrophic scarring (HS) affects ~35% of surgeries, causing physical and psychological distress.
• Understanding HS mechanisms and developing prognostic tools are essential.
• Existing methods lack predictive accuracy for identifying individuals prone to HS.

Purpose of the Study:

• To investigate systemic immunological differences between patients developing HS and normotrophic scars (NS).
• To assess if these immunological differences can predict HS development.
• To evaluate the potential of cytokine profiles and skin irritation thresholds as prognostic markers.

Main Methods:

• Prospective cohort study comparing NS and HS groups.
• Analysis of cytokine release from peripheral blood mononuclear cells (PBMC).
• Evaluation of skin irritation threshold (IT) using sodium lauryl sulphate patch testing.

Main Results:

• Low levels of MCP-1, IL-8, IL-18, and IL-23 in PBMCs strongly correlated with HS development (AUC 0.790-0.883).
• Combinations of cytokines (e.g., TNF-a, MCP-1, IL-23) significantly improved predictive accuracy (AUC 0.942).
• The HS group exhibited a lower skin IT compared to the NS group, with 68% accuracy.

Conclusions:

• Significant immunological differences exist between individuals who develop HS and those who do not.
• Cytokine assays offer a basis for a predictive prognostic test for HS.
• The skin irritation patch test presents a more accessible, less invasive option for clinical practice.