Attached files

file filename
EX-10.20 - EX-10.20 - TESARO, Inc.a2209741zex-10_20.htm
S-1/A - S-1/A - TESARO, Inc.a2209741zs-1a.htm

QuickLinks -- Click here to rapidly navigate through this document


Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

        We consent to the reference to our firm under the caption "Experts" and to the use of our report dated May 3, 2012, in Amendment No. 4 to the Registration Statement (Form S-1) and the related Prospectus of TESARO, Inc.

                        /s/ Ernst & Young LLP

Boston, Massachusetts
May 23, 2012




QuickLinks

Consent of Independent Registered Public Accounting Firm