June 13, 2017

Special Meeting of OncoGenex Stockholders to Vote on Proposed Merger Scheduled for August 1, 2017

MILL VALLEY, Calif., BOTHELL, Wash. and VANCOUVER, British Columbia, June 13, 2017 /CNW/ — Achieve Life Sciences, Inc. (Achieve) and OncoGenex Pharmaceuticals, Inc. (NASDAQ: OGXI) (OncoGenex) today announced that the Registration Statement on Form S-4 has been declared effective by the Securities and Exchange Commission (“SEC”) on June 13, 2017.

The special meeting of the OGXI stockholders will be held on August 1, 2017, at 9 a.m. PT at 1191 Second Avenue, Floor 10, Seattle, Washington, 98101.

OncoGenex will ask its stockholders to approve the merger with Achieve and the issuance of OncoGenex common stock in the merger pursuant to the merger agreement. Stockholders will be asked to approve an amendment to the OncoGenex certificate of incorporation to effect a reverse stock split of OncoGenex common stock, at a ratio not to exceed 1-for-20, with such specific ratio to be determined by OncoGenex’s board directors, in consultation with Achieve’s board of directors. OncoGenex’s board of directors intends to set the specific ratio at the lowest ratio required to meet the minimum bid price requirements of the NASDAQ Capital Market.

Additionally, approval will be sought for an amendment to the OncoGenex certificate of incorporation to change the OncoGenex corporate name to “Achieve Life Sciences, Inc.”. OncoGenex is also a