Comprehensive analysis of vitreous specimens for uveitis classification: a prospective multicentre observational...

Area of Science:

• Ophthalmology
• Immunology
• Infectious Diseases

Background:

• Uveitis classification can be challenging, necessitating advanced diagnostic tools.
• Vitreous analysis offers a direct route to identifying intraocular inflammation markers.

Purpose of the Study:

• To evaluate the clinical relevance and diagnostic value of vitreous biomarkers in classifying diverse uveitis etiologies.
• To assess the utility of T-cell subsets, B-cell subsets, and pathogen DNA in vitreous fluid.

Main Methods:

• A prospective, observational study involving 191 patients with various uveitis causes.
• Analysis of vitreous samples using flow cytometry, cytology, and multiplex PCR.
• Primary outcomes included diagnostic values of biomarkers; secondary outcome was visual acuity post-vitrectomy.

Main Results:

• Distinct vitreous biomarker profiles were observed for sarcoidosis (CD4/CD8 ratio, CD4+), viral infections (pathogen DNA, CD8+), and intraocular tumors (CD19+).
• Specific differences in lymphocyte subsets (CD4/CD8, CD4+, CD8+, CD19+) were noted across uveitis etiologies.
• Visual acuity significantly improved following vitrectomy across all patient groups.

Conclusions:

• Vitreous biomarker profiles, particularly infiltrating lymphocytes, effectively differentiate uveitis etiologies.
• Analysis of CD4/CD8 ratio, T-lymphocyte, B-lymphocyte subsets, and pathogen DNA in vitreous samples provides high diagnostic value for uveitis classification.
• These analyses are safe and contribute significantly to understanding and managing uveitis.