OMED Oncomed Pharmaceuticals, Inc.

OncoMed Pharmaceuticals, Inc. (Nasdaq:OMED), a clinical-stage biopharmaceutical company focused on discovering and developing novel anti-cancer therapeutics, today announced that the Company will report fourth quarter and full year 2017 financial results and operational highlights on Thursday, March 8th, 2018. OncoMed management will host a conference call and webcast at 4:30 p.m. Eastern Time (ET) / 1:30 p.m. Pacific Time (PT).

Analysts and investors can participate in the conference call by dialing (855) 420-0692 (domestic) and (484) 756-4194 (international) using the conference ID# 4997704. The webcast of the conference call can be accessed live on the Investor Relations section of the OncoMed website, http://www.oncomed.com, and will be available for replay through June 30th, 2018.

An audio replay of the conference call can be accessed by dialing (855) 859-2056 (domestic) or (404) 537-3406 (international) utilizing the conference ID number listed above.

About OncoMed Pharmaceuticals OncoMed Pharmaceuticals is a clinical-stage biopharmaceutical company focused on discovering and developing novel anti-cancer therapeutics. OncoMed has internally discovered a broad pipeline of investigational drugs intended to address the fundamental biology driving cancer's growth, resistance, recurrence and metastasis. Navicixizumab (anti-DLL4/VEGF bispecific, OMP-305B83), rosmantuzumab (anti-RSPO3, OMP131-R10) and anti-TIGIT (OMP-313M32) are part of OncoMed's strategic alliance with Celgene Corporation. OncoMed is independently developing GITRL-Fc (OMP-336B11), as well as continuing to pursue new drug discovery research. For further information about OncoMed Pharmaceuticals, please see www.oncomed.com.

Investor Relations Contact:

Peter RahmerTrout Groupprahmer@troutgroup.com(646) 378-2973

Mike ZanoniTrout Groupmzanoni@troutgroup.com(646) 378-2924