Exhibit 99.1
The undersigned agree that this Schedule 13D, and all amendments thereto, relating to the Common Stock of AveXis, Inc. shall be filed on behalf of the undersigned.
DEERFIELD MGMT, L.P. By: J.E. Flynn Capital, LLC, General Partner By: /s/ Jonathan Isler Name: Jonathan Isler Title: Attorney-in-Fact DEERFIELD MGMT III, L.P. By: J.E. Flynn Capital III, LLC, General Partner By: /s/ Jonathan Isler Name: Jonathan Isler Title: Attorney-in-Fact DEERFIELD SPECIAL SITUATIONS FUND, L.P. By: Deerfield Mgmt, L.P., General Partner By: J.E. Flynn Capital, LLC, General Partner By: /s/ Jonathan Isler Name: Jonathan Isler Title: Attorney-in-Fact DEERFIELD PRIVATE DESIGN FUND III, L.P. By: Deerfield Mgmt III, L.P., General Partner By: J.E. Flynn Capital III, LLC, General Partner By: /s/ Jonathan Isler Name: Jonathan Isler Title: Attorney-in-Fact DEERFIELD INTERNATIONAL MASTER FUND, L.P. By: Deerfield Mgmt, L.P., General Partner By: J.E. Flynn Capital, LLC, General Partner By: /s/ Jonathan Isler Name: Jonathan Isler Title: Attorney-in-Fact |
DEERFIELD PARTNERS, L.P. By: Deerfield Mgmt, L.P., General Partner By: J.E. Flynn Capital, LLC, General Partner By: /s/ Jonathan Isler Name: Jonathan Isler Title: Attorney-in-Fact DEERFIELD MANAGEMENT COMPANY, L.P. By: Flynn Management LLC, General Partner By: /s/ Jonathan Isler Name: Jonathan Isler Title: Attorney-in-Fact JAMES E. FLYNN /s/ Jonathan Isler Jonathan Isler, Attorney-in-Fact |