As Sanofi SA gets ready to welcome a new CEO, the company along with partner Regeneron Pharmaceuticals Inc. said a happy hello as well to robust sales of Dupixent (dupilumab, dupi) and gained U.S. FDA clearance for the IL-4 receptor alpha antagonist to treat children, ages 2 to 11, with chronic spontaneous urticaria who remain symptomatic despite histamine-1 antihistamine treatment.