Onxeo to Present Overview of AsiDNA™ for Treatment of Solid Tumors at DNA Damage Response Therapeutics Summit 2019

Regulatory News:

Onxeo S.A. (Euronext Paris, NASDAQ Copenhagen: ONXEO FR0010095596), a clinical-stage biotechnology company specializing in the development of innovative drugs in oncology, targeting tumor DNA Damage Response (DDR) to fight resistant cancers, today announced that the Company was invited to present an overview of AsiDNA™ for the treatment of solid tumors at the 2^nd DNA Damage Response Therapeutics Summit (DDRTS) to be held January 29-31, 2019, in Boston, MA.

This leading industry summit provides the opportunity to gain exclusive insights on the latest innovations in the field of tumor DNA Damage Response. The presence of prominent pharmaceutical groups and research institutions testifies to the attractiveness of this rapidly growing field.

Onxeo will present an overview of AsiDNA™, the Company’s first-in-class compound targeting tumor DNA break repair pathways, during a session entitled, "New Developments in PARP Inhibitors & Novel DDR Pathway Targets.”

Françoise Bono, Chief Scientific Officer of Onxeo, said: "AsiDNA™ has shown unique properties in translational research, notably its ability to prevent resistance to PARP inhibitors and to potentiate their activity in cancer cells, regardless of genetic mutation status. Its strong synergy with DNA-damaging agents, such as chemotherapies and PARP inhibitors, could also open new therapeutic options in difficult-to-treat cancers. We are pleased to have been selected to present at this benchmark event among the world’s most recognized stakeholders in DNA Damage Response. This is the ideal forum to update the industry, scientific and clinical experts on the recent clinical development progress achieved with AsiDNA™, a highly-differentiated molecule acting upstream of multiple DNA damage response pathways.”

Session: New Developments in PARP Inhibitors & Novel DDR Pathway Targets
Date: Wednesday, January 30, 2019
Time: 2:00 pm
Location: Revere Hotel Boston Common, 200 Stuart St., Boston, MA 02116
Onxeo’s presentation: AsiDNA™, A First-in-Class Decoy Oligonucleotide Targeting DNA Repair to Kill Tumor Cells

• AsiDNA™ is an innovative global DNA damage response inhibitor preventing recruitment of enzymes involved in DSB and SSB repair at the damage site
• AsiDNA™ is synergistic with PARP inhibitors, prevents and reverses PARPi-acquired resistance
• Recent outcomes from the phase 1 clinical study of AsiDNA™

For further information, please visit the DNA Damage Response Therapeutics Summit website.

About Onxeo

Onxeo (Euronext Paris, NASDAQ Copenhagen: ONXEO) is a clinical-stage biotechnology company developing innovative oncology drugs targeting tumor DNA-binding functions through unique mechanisms of action in the sought-after field of DNA Damage Response (DDR). The Company is focused on bringing early-stage first-in-class or disruptive compounds (proprietary, acquired or in-licensed) from translational research to clinical proof-of-concept, a value-creating inflection point appealing to potential partners.

Onxeo is developing AsiDNA™, a first-in-class, highly differentiated DNA Damage Response (DDR) inhibitor based on a unique decoy & agonist mechanism acting upstream of multiple DDR pathways. Translational research has highlighted the unique properties of AsiDNA™, notably its ability to oppose and even reverse tumor resistance to PARP inhibitors regardless of the genetic mutation status, and its strong synergy with other tumor DNA-damaging agents such as chemotherapy and PARP inhibitors. AsiDNA™ is currently being evaluated for systemic (IV) administration in advanced solid tumors in the DRIIV-1 phase I study (DNA Repair Inhibitor administered IntraVenously).

AsiDNA™ is the first compound generated from platON™, the Company’s proprietary chemistry platform of decoy oligonucleotides dedicated to generate new innovative leads and broaden Onxeo’s pipeline.

Onxeo’s portfolio also includes belinostat, an HDAC inhibitor (epigenetics). Belinostat is already conditionally FDA-approved in the US as a 2^nd line treatment for patients with peripheral T cell lymphoma and marketed in the US by Onxeo’s partner, Spectrum Pharmaceuticals, under the name Beleodaq® (belinostat IV form).

For further information, please visit www.onxeo.com

Forward looking statements

This communication expressly or implicitly contains certain forward-looking statements concerning Onxeo and its business. Such statements involve certain known and unknown risks, uncertainties and other factors, which could cause the actual results, financial condition, performance or achievements of Onxeo to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. Onxeo is providing this communication as of this date and does not undertake to update any forward-looking statements contained herein as a result of new information, future events or otherwise. For a discussion of risks and uncertainties which could cause actual results, financial condition, performance or achievements of Onxeo to differ from those contained in the forward-looking statements, please refer to the section 5.7.1.4 "Risk Factors” ("Facteurs de Risque") of the 2017 registration document filed with the Autorité des marchés financiers on April 25, 2018 under number D.18-0389, which is available on the Autorité des marchés financiers website (www.amf-france.org) or on the Company’s website (www.onxeo.com).

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