Acceleron Pharma to Host Fourth Quarter and Year Ended 2014 Financial Results Conference Call and Webcast on March 2, 2015

Acceleron Pharma Inc. (NASDAQ:XLRN), a clinical stage biopharmaceutical company focused on the discovery, development and commercialization of novel therapeutic candidates that regulate cellular growth and repair, today announced that the company will host a conference call and live audio webcast to report its fourth quarter and year ended 2014 financial results and provide a corporate update on Monday, March 2, 2015, at 8:00 AM EST.

To participate by teleconference, please dial 877-312-5848 (domestic) or 253-237-1155 (international) and refer to the Acceleron Q4 Earnings Call. To access the live webcast, please select “Events & Presentations” in the Investors & Media section on the Company’s website (www.acceleronpharma.com). To ensure a timely connection, it is recommended that users register at least 15 minutes before the scheduled webcast.

A replay of the webcast will be archived on the Company’s website and available beginning approximately two hours after the event.

About Acceleron

Acceleron is a clinical stage biopharmaceutical company focused on the discovery, development and commercialization of novel therapeutic candidates that regulate cellular growth and repair. The company is a leader in understanding the biology of the Transforming Growth Factor-Beta (TGF-β) protein superfamily, a large and diverse group of molecules that are key regulators in the growth and repair of tissues throughout the human body, and in targeting these pathways to develop important new medicines. Acceleron has built a highly productive R&D platform that has generated innovative clinical and preclinical protein therapeutic candidates with novel mechanisms of action. These protein therapeutic candidates have the potential to significantly improve clinical outcomes for patients with cancer and rare diseases. For more information, please visit www.acceleronpharma.com.