Table 4.

List of studies on the relationship between Behçet disease and YKL-40 (chitinase-3-like protein-1, human cartilage glycoprotein-39).

Authors, year	Study design	Main study findings
Seo J et al., 2016 84	-Comparison of plasma levels of YKL-40 in 112 Behcet's disease patients and 45 healthy volunteers.	• Serum YKL-40 might be a provider of the pathophysiology of Behcet's disease and useful marker for monitoring Behcet's disease patients.
Bilen H et al, 2016 85	-Comparison of plasma levels of chitinase-3-like 1 protein and its association with malondialdehyde in 51 Behcet's disease patients and 28 healthy controls by SPSS 20.	• Chitinase-3-like 1 protein might be associated with Behcet's disease. • The levels of malondialdehyde had no significant correlation with Chitinase-3-like 1 protein.

Abbreviations: SPSS: statistical package for social science.