NCT06451744

Cellular and Molecular Biomarkers in Patients With Lichen Planus

Evaluation of the Clinical Specificity of Cellular and Molecular Biomarkers Identified in Patients With Lichen Planus

• Status: Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 70 (estimated)
• Sponsor: Institut Pasteur · Industry
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

Lichen planus (LP) is a chronic inflammatory disease of unknown aetiology, affecting the skin and mucous membranes, characterised by a CD8+ cytotoxic T-cell infiltrate, associated with epithelial cell death and disruption of the basement membrane zone. In previous work, T cell antigen receptor (TCR) repertoire studies were performed. In all patients tested, whether with erosive or non-erosive LP, unique nucleotide sequences, called clonotypes, have been identified. They appear during the process of TCR gene rearrangement. These clonotypes are specific for human papillomavirus (HPV) in blood and lesions, suggesting antigenic stimulation of these clonotypes by a viral epitope of HPV, which crosses with an epitope on keratinocytes. The diagnosis of LP is made on the basis of clinical and histological criteria, but in some patients and in some anatomical locations, the diagnosis is difficult to make and LP may be confused with other skin conditions.

Detailed description

Lichen planus (LP) is a chronic inflammatory disease of unknown aetiology, affecting the skin and mucous membranes, characterised by a CD8+ cytotoxic T-cell infiltrate, associated with epithelial cell death and disruption of the basement membrane zone. Several triggers have been proposed for LP, including viral antigens. In previous work, T cell antigen receptor (TCR) repertoire studies were performed, i.e. investigating the diversity of TCRs expressed on the surface of an individual's lymphocyte population. In all patients tested, whether with erosive or non-erosive LP, unique nucleotide sequences, called clonotypes, have been identified. They appear during the process of TCR gene rearrangement. These clonotypes are specific for human papillomavirus (HPV) in blood and lesions, suggesting antigenic stimulation of these clonotypes by a viral epitope of HPV, which crosses with an epitope on keratinocytes. The diagnosis of LP is made on the basis of clinical and histological criteria, but in some patients and in some anatomical locations, the diagnosis is difficult to make and LP may be confused with other skin conditions.

Conditions

• Lichen Planus

Interventions

Type	Name	Description
OTHER	Blood samples collection	50 mL blood sample
OTHER	Skin or mucous membrane brushing	brushing on skin or mucous membrane lesions
OTHER	Skin or mucous membrane biopsy	6 mm biopsy

Timeline

• Start date: 2023-11-01
• Primary completion: 2026-04-30
• Completion: 2027-04-30
• First posted: 2024-06-11
• Last updated: 2025-07-01

Locations

6 sites across 1 country: France