Alemtuzumab-related thyroid dysfunction in a phase 2 trial of patients with relapsing-remitting multiple sclerosis.

Context: Alemtuzumab, an anti-CD52 monoclonal antibody, increased the risk of thyroid dysfunction in CAMMS223, a phase 2 trial in relapsing-remitting multiple sclerosis.

Objective: The objective of the study was a detailed description of thyroid dysfunction in CAMMS223.

Design: Relapsing-remitting multiple sclerosis patients (n=334) were randomized 1:1:1 to 44 μg sc interferon-β-1a (SC IFNB-1a, Rebif) or annual courses of 12 or 24 mg iv alemtuzumab.