Attached files

file filename
EX-32.2 - EX-32.2 - MERRIMACK PHARMACEUTICALS INCmack-ex322_7.htm
EX-32.1 - EX-32.1 - MERRIMACK PHARMACEUTICALS INCmack-ex321_6.htm
EX-31.2 - EX-31.2 - MERRIMACK PHARMACEUTICALS INCmack-ex312_8.htm
EX-31.1 - EX-31.1 - MERRIMACK PHARMACEUTICALS INCmack-ex311_9.htm
EX-21.1 - EX-21.1 - MERRIMACK PHARMACEUTICALS INCmack-ex211_11.htm
EX-10.21 - EX-10.21 - MERRIMACK PHARMACEUTICALS INCmack-ex1021_773.htm
EX-10.7 - EX-10.7 - MERRIMACK PHARMACEUTICALS INCmack-ex107_805.htm
EX-10.6 - EX-10.6 - MERRIMACK PHARMACEUTICALS INCmack-ex106_806.htm
EX-4.6 - EX-4.6 - MERRIMACK PHARMACEUTICALS INCmack-ex46_804.htm
EX-4.5 - EX-4.5 - MERRIMACK PHARMACEUTICALS INCmack-ex45_803.htm
10-K - 10-K - MERRIMACK PHARMACEUTICALS INCmack-10k_20161231.htm

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Forms S-3 (No. 333-194312) and S-8 (Nos. 333-180996, 333-186370, 333-194313, 333-202346 and 333-209745) of Merrimack Pharmaceuticals, Inc. of our report dated March 1, 2017 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Boston, Massachusetts

March 1, 2017