REGENXBIO Inc. (Nasdaq: RGNX), a leading clinical-stage biotechnology company seeking to improve lives through the curative potential of gene therapy based on its proprietary NAV® Technology Platform, today announced that it has received an accelerated license payment of $100 million under its license agreement (the License Agreement) with AveXis, Inc. (AveXis) for the development and commercialization of products to treat spinal muscular atrophy (SMA), due to the acquisition of AveXis by Novartis AG (Novartis).