YKL-40 is a CSF biomarker of intrathecal inflammation in secondary progressive multiple sclerosis. Burman J, Raininko R, Blennow K, Zetterberg H, Axelsson M, Malmeström C J Neuroimmunol. 2016 Mar 15; 292:52-7. Epub 2016 Jan 22. PMID: 26943959. Abstract CommentRecommendBookmarkWatch