June 15th to 18th 2015, Philadelphia

Regulatory News:

OSE Pharma SA (ISIN: FR0012127173; Mnémo: OSE), a biotechnology company based in France, developing T specific immunotherapy treatments against invasive and metastatic cancers, is pleased to announce its participation to the Bio International Convention, in Philadelphia from June 15th to 18th, 2015.

Best known international business convention among biotechnology and pharmaceutical industry players, BIO International Convention is the world’s largest biotechnology gathering, which includes business meeting’s sessions, conferences and exhibition’s area.

It is a unique place to meet industry players, scientific experts and financial investors and to enter into discussions over partnership agreements. Emile Loria, Chairman, Dominique Costantini, Chief Executive Officer and Alexis Peyroles, Chief Financial Officer will represent OSE Pharma at BIO.

“Our recent Initial Public Offering (IPO) on Euronext in Paris will allow us to finance our pivotal clinical phase 3 in non small cell lung cancer treatment and we also can plan our first exploratory new phase 2 study through a partnership in therapeutic combination or for new indications against other cancers. The BIO Convention brings together all the key players of the biotechnology’s world and pharmaceutical’s industry. We intend to take advantage of the recent signing of an exclusive long term agreement with RAFA Laboratories on Tedopi® in Israel to initiate other contacts for our new exploratory phase 2 study and potential licensing agreements in growth and emerging countries,” explained Dominique Costantini, CEO of OSE Pharma.

About OSE Pharma

OSE Pharma is a European cancer immunotherapy company with a multi-epitope technology named Memopi® that directs the body’s immune system to generate a specific cytotoxic T response to prevent cancer cell growth.

OSE Pharma’s lead product, Tedopi®, combines 10 “neo-epitopes” directed against five tumour associated antigens. In its most advanced application, it is about to enter a pivotal Phase III study in patients with advanced non-small cell lung cancer (NSCLC) who express HLA-A2 and failed first line therapy. Tedopi® has orphan drug status in the USA and is considered as personalized medicine in Europe in HLA-A2 positive patients.

OSE Pharma is also planning a new Phase II clinical trial in combination with another immunotherapy treatment in NSCLC.

Tedopi® targets five tumour associated antigens (TAA), selected because their presence is linked to a poor prognosis and the severity of various cancers. Tedopi® contains ten optimized epitopes, or “neo- epitopes”, designed on the binding of HLA-A2 and TCR. These neo-epitopes generate strong specific T cytotoxic responses that fight cancer and prevent tumour escape.

OSE PHARMA: a new T specific immunotherapy weapon against advanced cancers

  • Immunotherapy in oncology is becoming a clinical reality and raises hope for patients by mobilizing their own immune defence to fight against cancer.
  • For OSE Pharma’s lead product Tedopi®: the Phase 3 clinical programme is scheduled in 2015 and will be active in Europe and in the USA, in order to obtain registration in non-small cell lung cancer. The study will recruit patients with invasive/metastatic non-small cell lung cancer (NSCLC), expressing the HLA-A2 receptor (45% of the NSCLC population).
  • Tedopi® is a patented combination of 10 epitopes. The epitopes (small peptides triggering immune response) are optimized. They have been selected and modified for a stronger binding with immune response receptors (HLA-A2 and TCR). These neo-epitopes trigger a stronger immune response and target 5 tumor associated antigens expressed in several cancers.
  • Tedopi® will enter in new therapeutic combinations in Phase 2 studies with industrial partnerships (other immunotherapy treatments or targeted therapies) to increase clinical efficacy while maintaining high quality of life with late-stage patients.
  • Tedopi® has been granted “orphan drug” status in the USA and is considered a personalised medicine in Europe, enabling accelerated clinical development.

PIVOTAL PHASE 3 STUDY IN LUNG CANCER LAUNCHED IN 2015 IN EUROPE AND IN THE USA

Tedopi® has been tested in a phase 2 study in patients with non-small cell lung cancer1 (NSCLC- the most common form of lung cancer). These patients were HLA-A2 positive, had an invasive or metastatic disease and had received at least one previous line of treatment. The results of this phase 2 trial showed that Tedopi® generated a significant increase in the survival times of patients with NSCLC, which correlates with immune response.

This study showed a one year survival rate of 59% for the group treated with Tedopi®. This compares favourably with the 33% one year survival rate in patients treated with currently approved second line treatments2. The median survival in the group treated was 17 months, compared with 12 months in the group of patients who did not receive the treatment. In addition, 25% of patients treated were still alive after 4 years, with a good quality of life, which is important for patients suffering from principally metastatic tumours3.

OSE Pharma is currently preparing to start a phase 3 study of Tedopi®. The trial protocol is common to Europe and to the USA. The launch of the Phase 3 study of Tedopi® is planned for the second half of 2015.

It will look to enrol 500 patients with invasive/metastatic non-small cell lung cancer (NSCLC), expressing the HLA-A2 receptor. Tedopi® will be used as a second line treatment for patients for whom first line treatments (such as chemotherapy) have not been able to control their disease. Preparatory works and manufacturing of the clinical supplies have started. An agreement has been signed in January 2015 with Orion-Symbec, CRO based in Great-Britain for this international Phase 3 study.

ADVANCED LUNG CANCER: A STRONG MEDICAL NEED

Lung cancer is the deadliest cancer in the world. In 2012, there were 1.58 million new diagnosed lung cancer cases and 1.39 million deaths from this disease globally4. Despite the different treatments available today (surgery, radiotherapy, chemotherapy, targeted therapy), the relative survival rates of these patients at metastatic stage remains very low3. Given the large incidence of NSCLC, OSE Pharma estimates that the potential global sales at peak for Tedopi® for this single indication could be about €2 billion4.

Disclaimer:

This press release may expressly or implicitly contain forward-looking statements relating to OSE Pharma and its activity. Although OSE Pharma’s management believes that the expectations reflected in these forward-looking statements are reasonable, investors are cautioned that such statements are related to known or unknown risks, uncertainties and other factors that could lead actual results, financial conditions, performance or achievements to differ materially from OSE Pharma’s results, financial conditions, performance or achievements expressed, projected or implied by such information and forward-looking statements.

Other than as required by applicable law (article 223-1 et seq of the General Regulation of the AMF), OSE Pharma issues this press release at the date hereof and does not undertake any obligation to update or revise any forward-looking information or statements.

These risks and uncertainties include among other things, the uncertainties inherent in future clinical data and analysis, including post marketing, decisions by regulatory authorities, such as the FDA or the EMA, regarding whether and when to approve any drug, and other matters that could affect the availability or commercial potential of such product candidates, the absence of guarantee that the product candidates if approved will be commercially successful, the future approval and commercial success of therapeutic alternatives,

For a description of risks and uncertainties which could lead to discrepancies between actual results, financial condition, performance or achievements and those contained in the forward-looking statements, please refer to Chapter 4 "Risk Factors" of the company’s Documents de Base filed with the AMF under number I. 14-056 on September, 17th 2014 and Chapter 2 "Risk Factors related to the Offer" in the prospectus approved by the AMF under number 15-078 on 6th March 2015, which can be found on the websites of the AMF (www.amf-france.org) and of OSE Pharma (www.osepharma.com).

1 NSCLC– 88% of lung cancers

2 (Cielanu T et al 2012) (Hanna N et al 2004) (Garassino MC et al 2013)

3 Overall survival rate after 5 years: 1% for metastatic cancers – American Cancer Society – 22/05/2013

4 Based on independent studies, source international epidemiologic data, Globocan 2012

OSE Pharma saDominique Costantini, CEOdominique.costantini@osepharma.comMob +33 6 13 20 77 49orAlexis Peyroles, CFOAlexis.peyroles@osepharma.comMob : +33 6 11 51 19 77orCitigate Dewe RogersonLaurence Bault / Lucie Larguier+33 1 53 32 84 78laurence.bault@citigate.frorHB ComCorpFlorence Portejoie / Anne Hardy+33 6 88 84 81 74 -fportejoie@comcorp.fr

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