Effect of erenumab on the reversion from chronic migraine to episodic migraine in an Asian population: A post hoc analysis of the DRAGON study

Background Erenumab is a fully human monoclonal antibody that selectively targets the calcitonin gene–related peptide receptor. It has been proven to be safe and efficacious in patients with episodic migraine (EM) and chronic migraine (CM) as demonstrated in phase 2 and 3 clinical trials including patients from Europe, Japan, and the United States. Reversion from CM to EM, as indicated by a reduction in the frequency of headache days, is an important indicator for efficacy outcome, though it has not been analyzed widely in patients with CM to date. Objective Primary results of the DRAGON study demonstrated the efficacy and safety of erenumab in patients with CM from China and other Asian countries. This post hoc analysis evaluated the rate of reversion from CM to EM in the overall population and in subgroups of patients defined by baseline demographic and clinical characteristics (age, body mass index, gender, prior preventive treatment failure, medication overuse status, and disease duration). Methods Reversion from CM to EM was defined as a reduction in headache frequency to