Sunesis Pharmaceuticals Announces Poster Presentation on Preliminary Results from the Phase 1A Healthy Volunteer Study Evaluating Oral Non-Covalent BTK-inhibitor SNS-062 at the European School of Haematology’s 2nd International Conference on New Concepts

SOUTH SAN FRANCISCO, Calif., Sept. 01, 2016 -- Sunesis Pharmaceuticals, Inc. (Nasdaq:SNSS) today announced that a poster detailing preliminary results from the Company’s Phase 1A study in healthy volunteers evaluating oral non-covalent BTK-inhibitor SNS-062 will be presented at the European School of Haematology’s 2^nd International Conference on New Concepts in B-Cell Malignancies being held September 9-11, 2016, at the Estoril Congress Centre in Estoril, Portugal.

The details for the poster presentation are as follows:

Date & Time: Saturday, September 10, 2016, from 6:50 p.m. to 8:20 p.m. Central European Time

Poster Title: A Phase 1a Study to Investigate the Safety, Pharmacokinetics, and Pharmacodynamics of the Noncovalent Bruton Tyrosine Kinase (BTK) Inhibitor SNS-062 in Healthy Subjects: Preliminary Results

The poster will be available on the Sunesis website following the presentation.

Conference Call and Webcast Information
Sunesis will host a conference call and slide webcast on, Monday, September 12 at 8:00 a.m. Eastern Time. The call can be accessed by dialing (844) 296-7720 (U.S. and Canada) or (574) 900-1148 (international), and entering passcode 70718677. To access the live audio webcast, or the subsequent archived recording, visit the "Investors and Media - Calendar of Events" section of the Sunesis website at www.sunesis.com. The webcast will be recorded and available for replay on the company's website for two weeks.

About SNS-062
SNS-062 is a novel, second-generation BTK inhibitor, a class of kinase inhibitors that selectively inhibits the enzyme Bruton's tyrosine kinase (BTK). This target mediates signaling through the B-cell receptor, which is critical for adhesion, migration, proliferation and survival of normal and malignant B-lineage lymphoid cells. Unlike other drugs in its class, SNS-062 has a distinct kinase selectivity profile and binds non-covalently to the BTK enzyme, potentially providing an opportunity to address the leading resistance mechanism, a mutation in the enzyme’s binding site required for covalent binding. In preclinical studies, SNS-062 demonstrated potent activity against Cys-481S mutated B-cell malignancies, and is currently being studied in healthy subjects in a Phase 1A, randomized, double-blind, placebo-controlled dose-ranging study to investigate the drug’s safety, pharmacokinetics, and pharmacodynamics. With a successful study outcome, SNS-062 is expected to proceed to a Phase 1B/2 study in patients with B-cell malignancies around year end 2016.

About Sunesis Pharmaceuticals
Sunesis is a biopharmaceutical company focused on the development and commercialization of new oncology therapeutics for the potential treatment of solid and hematologic cancers. Sunesis has built a highly experienced cancer drug development organization committed to improving the lives of people with cancer. Currently, the company is focused on pursuing regulatory approval in Europe for its lead product candidate, vosaroxin, for the treatment of relapsed or refractory acute myeloid leukemia in patients aged 60 and older, as well as advancing its novel kinase-inhibitor pipeline, which includes its proprietary non-covalent BTK-inhibitor, SNS-062.

For additional information on Sunesis, please visit http://www.sunesis.com.

SUNESIS and the logos are trademarks of Sunesis Pharmaceuticals, Inc.

Investor and Media Inquiries:
David Pitts
Argot Partners
212-600-1902

Eric Bjerkholt
Sunesis Pharmaceuticals Inc.
650-266-3717