Exhibit A
JOINT FILING STATEMENT
I, the undersigned, hereby express my agreement that the attached Schedule 13D (and any amendments thereto) relating to the Common Stock of Tesaro, Inc. is filed on behalf of each of the undersigned.
Date: July 12, 2012
INTERWEST PARTNERS X, L.P.
| By: | InterWest Management Partners X, LLC | |
| Its: | General Partner | |
| By: | /s/ W. Stephen Holmes | |
| W. STEPHEN HOLMES III | ||
| Managing Director | ||
| INTERWEST MANAGEMENT PARTNERS X, LLC | ||
| By: | /s/ W. Stephen Holmes | |
| W. STEPHEN HOLMES III | ||
| Managing Director | ||
/s/ Katie A. Passalacqua | ||
| Katie A. Passalacqua, Attorney-in-Fact for Harvey B. Cash | ||
/s/ Katie A. Passalacqua | ||
| Katie A. Passalacqua, Attorney-in-Fact for Philip T. Gianos | ||
/s/ W. Stephen Holmes | ||
| W. Stephen Holmes III | ||
/s/ Katie A. Passalacqua | ||
| Katie A. Passalacqua, Attorney-in-Fact for Gilbert H. Kliman | ||
/s/ Katie A. Passalacqua | ||
| Katie A. Passalacqua, Attorney-in-Fact for Arnold L. Oronsky | ||
/s/ Katie A. Passalacqua | ||
| Katie A. Passalacqua, Attorney-in-Fact for Thomas L. Rosch | ||
/s/ Katie A. Passalacqua | ||
| Katie A. Passalacqua, Attorney-in-Fact for Bruce A. Cleveland | ||
/s/ Katie A. Passalacqua | ||
| Katie A. Passalacqua, Attorney-in-Fact for Christopher B. Ehrlich | ||
/s/ Katie A. Passalacqua | ||
| Katie A. Passalacqua, Attorney-in-Fact for Nina Kjellson | ||
/s/ Katie A. Passalacqua | ||
| Katie A. Passalacqua, Attorney-in-Fact for Khaled A. Nasr | ||
/s/ Katie A. Passalacqua | ||
| Katie A. Passalacqua, Attorney-in-Fact for Douglas A. Pepper | ||
/s/ Katie A. Passalacqua | ||
| Katie A. Passalacqua, Attorney-in-Fact for Keval Desai | ||
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