Exhibit 31.1
CERTIFICATION
I, Leon O. Moulder, Jr., certify that:
| 1. |
| I have reviewed this Amendment No. 1 to the Quarterly Report on Form 10-Q of TESARO, Inc.; and |
| 2. |
| Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. |
Date: March 22, 2017 |
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| /s/ Leon O. Moulder, Jr. |
| Leon O. Moulder, Jr. |
| Chief Executive Officer |
| (principal executive officer) |
