Age

18–any

Sex

ALL

Healthy volunteers

Not accepted

Clinical diagnosis of RRMS at DMF initiation
Minimum of 3 months of continuous treatment with DMF\*
Initiation of DMF between January 1st, 2016 and December 15th, 2020
Minimum of 2 ALC assessments:
1. 1 ALC at DMF initiation (or within 6 months before DMF initiation); or under DMF treatment
2. 1 ALC before the database extraction (15/06/2021).
* to avoid the early DMF discontinuations for reasons other than lymphopenia.

Participants will be excluded from the study entry if they express their opposition to collect the data upon the information.

Real World Analysis on Lymphocyte Reconstitution After Lymphopenia in Participants Treated by Tecfidera