CHI3L1 and asthma: Chitinase 3‐like 1 (CHI3L1) gene, encoding YKL‐40, was reported to play a role in asthma, bronchial hyper‐responsiveness, abnormal lung function and hepatitis C virus–induced liver fibrosis,9, 10, 11 while no significant association between CHI3L1 gene variants and cardiovascular diseases was observed.5, 12