Opsona Therapeutics Ltd. to present preliminary results from ongoing study in second line lower risk myelodysplastic syndrome at the 58th Annual Meeting of the American Society of Hematology (ASH)

Dublin, Ireland – Opsona Therapeutics Ltd (‘Opsona’), the innate immune drug development company focused on novel therapeutic approaches to treat oncology, autoimmune and other inflammatory diseases, today announces that it will present preliminary results from its ongoing prospective, open label Phase I/II study being conducted with OPN-305 in second-line lower (Low and intermediate-1) risk myelodysplastic syndrome (MDS). The presentation will take place on Saturday, 3 December at the 58th Annual Meeting of the American Society of Hematology (ASH) in San Diego.

Myelodysplastic syndromes are a complex and heterogeneous group of bone marrow failure disorders characterized by ineffective hematopoiesis and poor prognosis. There is an urgent need for the development of novel therapies in the treatment of MDS which can delay progression, improve patient survival and quality of life, and which have fewer adverse effects. Opsona has recently received orphan drug designation (ODD) from the United States Food and Drug

Administration for MDS.

OPN-305 is a novel proprietary humanized IgG4 monoclonal antibody (MAb) against Toll-Like Receptor 2 (TLR2), a key target within the innate immune system.

The study in patients with lower risk MDS who have failed hypomethylating agents is ongoing in collaboration with MD Anderson Cancer Center in Houston USA with additional sites now being added in the USA. The lead principal investigator Professor Guillermo Garcia-Manero will present the preliminary data at ASH and commenting on today’s announcement said “Inhibition of TLR2 with OPN-305 is safe and is currently demonstrating strong clinical activity in patients with lower risk MDS after hypomethylating agent therapy”

Details of the presentation are as follows:

A Clinical Study of OPN-305, a Toll-like receptor 2 (TLR-2) antibody, in patients with Lower Risk Myelodysplastic Syndromes (MDS) that have received prior Hypomethylating Agent (HMA) Therapy

Abstract # 227
Session Name: 637. Myelodysplastic Syndromes—Clinical Studies: Lower Risk MDS Clinical Studies
Session Date: Saturday, December 3, 2016
Session Time: 4:00 PM - 5:30 PM
Presentation Time: 5:00 PM Room: Manchester Grand Hyatt San Diego, Grand Hall C

The ASH abstract is now online can be accessed here:

For further information, please contact:

Mary Reilly (VP Pharmaceutical Development and Operations) or Martin Welschof (CEO), telephone: + 353 16770223, e-mail: mreilly@opsona.com, mwelschof@opsona.com

About Opsona Therapeutics

Opsona is a leading immunology drug development company, focused on novel therapeutic approaches to key targets of the innate immune system associated with a wide range of major human diseases, including cancer, autoimmune and other inflammatory diseases. The company was founded in 2004 by three world-renowned immunologists at Trinity College, Dublin. Opsona has a strong international investor consortium including: Amgen Ventures, BB Biotech Ventures, EMBL Ventures, Enterprise Ireland, Fountain Healthcare Partners, Inventages Venture Capital, Novartis Venture Fund, Omnes Capital, Roche Venture Fund, Seroba Life Sciences, Shire and Sunstone Capital