Amgen has announced positive top-line results from the global Phase 2 study evaluating the efficacy and safety of erenumab (AMG 334) in chronic migraine prevention. The study met its primary endpoint of change in monthly migraine days. The reduction in migraine days was statistically significant for both the 70 mg and 140 mg doses.
"Migraine is the sixth leading cause of disability worldwide. Three to seven million Americans spend more than half of each month living with the debilitating symptoms of chronic migraine," said Sean E. Harper, M.D., executive vice president of Research and Development at Amgen. "These positive results are exciting because they add to the growing body of evidence supporting erenumab for the prevention of migraine. We look forward to Phase 3 episodic migraine data later this year."
At baseline, patients enrolled in this study were experiencing approximately 18 migraine days per month. Patients were randomized to receive either placebo, or one of two erenumab doses - 70 mg or 140 mg - subcutaneously, once monthly. Patients experienced a 6.6-day reduction from baseline in monthly migraine days in each of the erenumab treatment arms as compared to a 4.2-day reduction in the placebo arm, a statistically significant reduction in each erenumab treatment arm.
The safety profile of erenumab was similar to placebo across both treatment arms. No adverse event was reported in greater than five percent of patients treated with erenumab; the most common adverse events were injection site pain, upper respiratory tract infection and nausea.
Additional analyses of these data are ongoing and will be submitted to a future medical meeting and for publication.
About the 20120295 Study
The 20120295 study is a global Phase 2, randomized, 12-week, double-blind, placebo-controlled study evaluating the safety and efficacy of erenumab in chronic migraine prevention. In the study, 667 patients were randomized to receive once-monthly subcutaneous placebo or erenumab (70 mg or 140 mg) in a 3:2:2 ratio, respectively. The primary endpoint was change in monthly migraine days from baseline to the last four weeks of the 12-week treatment phase in patients with chronic migraine (the number of migraine days between weeks 9 and 12). Secondary study endpoints included reduction of at least 50 percent from baseline in monthly migraine days, change from baseline in monthly acute migraine-specific medication days and change from baseline in cumulative monthly headache hours.
Erenumab is a fully human monoclonal antibody under investigation for the prevention of migraine. Erenumab specifically targets the Calcitonin-Gene-Related-Peptide (CGRP) receptor, which is believed to transmit signals that can cause incapacitating pain. Erenumab is currently under evaluation in several large global, randomized, double-blind, placebo-controlled trials to assess its safety and efficacy in migraine prevention.