Galcanezumab Effects on Migraine Severity and Symptoms in Japanese Patients with Episodic Migraine: Secondary Analysis of a Phase 2 Randomized Trial

INTRODUCTION: Galcanezumab, a humanized monoclonal antibody against calcitonin gene-related peptide, is a preventive migraine treatment. In global, randomized, placebo-controlled trials, galcanezumab reduced migraine headache severity and the frequency of migraine headaches associated with nausea and/or vomiting, photophobia and phonophobia, prodromal symptoms, or aura. We report secondary analyses from a Japanese phase 2 trial that assessed the effect of galcanezumab on migraine headache severity, frequency of migraine-associated symptoms, and frequency of migraine headaches during menstrual periods in Japanese patients with episodic migraine. METHODS: Adults with migraine (International Classification of Headache Disorders, 3rd edition; 4–14 migraine headache days/month) were randomized (2:1:1) to a monthly placebo (n = 230), 120 mg galcanezumab (240 mg loading dose; n = 115), or 240 mg galcanezumab (n = 114) for 6 months (double-blind). Patients recorded migraine headache days, severity, and symptoms in an electronic diary. Changes from baseline were analyzed (mixed model for repeated measures). RESULTS: Both galcanezumab doses significantly reduced the number of monthly moderate-to-severe and severe migraine headache days compared with placebo, overall (difference in least-squares mean change from baseline, 120 mg/240 mg versus placebo: moderate-to-severe, −1.9/−1.8 days; severe: −0.4/−0.4 days) and in each month; mean severity score was significantly reduced in the 240 mg group. Both galcanezumab doses significantly reduced the number of migraine headache days with nausea/vomiting (−1.1/−1.0 days), photophobia/phonophobia (−2.3/−1.7 days), prodromal symptoms (−0.7/−0.8 days), and aura (−0.7/−0.7 days). In most cases, the proportion of migraine headache days with these symptoms was reduced by galcanezumab. Both galcanezumab doses reduced the number of migraine headache days occurring during menstrual periods (n = 269; −0.8/−0.9 days). CONCLUSION: Once-monthly galcanezumab significantly reduced the frequency of migraine headache days with moderate-to-severe or severe headache, migraine headache days with migraine-associated symptoms, and migraine headache days during menstrual periods in Japanese patients with episodic migraine, consistent with results from global studies. Trial Registration: ClinicalTrials.gov (NCT02959177). SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s40120-022-00410-3.