Abstract
Hidradenitis suppurativa (HS) is a chronic disease. Recently, we suggested, chitinase-3-like protein 1 (YKL-40) as a new biomarker for HS since its serum levels were found to be elevated in patients. The objective of this study was to examine YKL-40 tissue expression in HS. The study was conducted on 7 patients with HS. The biopsies were obtained from lesional and non-lesional skin. The tissue expression of YKL-40 was assessed using an immunohistochemical method. Inflammatory infiltrates of various grades were visible in all samples of lesional skin. The inflammatory cells within those infiltrates showed a strong cytoplasmic expression of YKL-40. In non-lesional HS skin the pattern of YKL-40 expression was similar to that observed in healthy skin. Inflammatory infiltrates in HS skin lesions may be responsible for the elevated YKL-40 serum level. YKL-40 can be considered one of the most valuable biomarkers of HS.
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