Sio Gene Therapies Inc. CEO Pavan Cheruvu said the company sees no “significant rate limiters to moving forward” with FDA fast-tracked AXO-AAV-GM1 for the treatment of GM1 gangliosidosis. Shares of the New York-based firm (NASDAQ:SIOX) closed at $2.36, up 21 cents, as Wall Street welcomed positive interim data from the ongoing phase I/II study with the adeno-associated viral vector 9-based gene therapy for GM1 gangliosidosis.