3003 Prognostic value of on-treatment serum neurofilament light chain for neT2 lesions relapsing MS patients: pooled analysis of ASCLEPIOS I/II by Jeannette Lechner-Scott, Wenjia Wei, Heinz Wiendl, Xavier Montalban, Stephen L Hauser, Tjalf Ziemssen, Douglas L Arnold, Enrique Alvarez, Tobias Derfuss, Thomas P Leist, Alit Bhatt, Ibolya Boer