Oral Cladribine in Patients who Change From First-Line Disease Modifying Treatments for Multiple Sclerosis: Protocol of a Prospective Effectiveness and Safety Study (CLAD CROSS).

CLAD CROSS will provide efficacy data on cladribine tablets, used as a follow-up treatment to first-line DMDs in the real-world setting, will further establish its safety profile and will collect information to support pharmacoeconomic studies.