Blueprint Medicines Corp (BPMC) Stock: Deerfield Management Reports New 4.51% Stake

Page 11 of 12

Page 11 of 12 – SEC Filing
 
Exhibit A
Agreement
The undersigned agree that this Schedule 13G, and all amendments thereto, relating to the Common Stock of Blueprint Medicines Corporation shall be filed on behalf of the undersigned.
DEERFIELD MGMT, L.P.
By: J.E. Flynn Capital, LLC, General Partner

 By: /s/ Jonathan Isler

      Jonathan Isler, Attorney-In-Fact
DEERFIELD MANAGEMENT COMPANY, L.P.
By:  Flynn Management LLC, General Partner

 By: /s/ Jonathan Isler

      Jonathan Isler, 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

      Jonathan Isler, 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

      Jonathan Isler, Attorney-In-Fact
 
JAMES E. FLYNN
/s/ Jonathan Isler
Jonathan Isler, Attorney-In-Fact
 

Follow Blueprint Medicines Corp (NASDAQ:BPMC)

Page 11 of 12