DBV Technologies Forms Research Collaboration with Inserm to Develop Viaskin® for Refractory Hemophilia A Disease

This Proof of concept study aims to capitalize on DBV’s safe and non-invasive technology and Inserm’s unique expertise to address refractory Hemophilia A, a severe orphan disease with no cost-effective and convenient treatment today available to patients

BAGNEUX, FRANCE, October 22nd, 2013 – DBV Technologies (Euronext: DBV – ISIN: FR0010417345), creator of Viaskin®, a
new standard in the treatment of allergies, announced today that it has entered into a research collaboration with Institut
national de la Santé et de la recherche médicale, Inserm and Inserm Transfert, to investigate the effect of epicutaneous
delivery of recombinant Factor VIII (FVIII) protein via Viaskin in an animal model of hemophilia A. DBV and Inserm are
teaming up to combine the Viaskin® technology and a world-class expertise in hemophilia A to develop a potential standard
of care for refractory hemophilia A patients, by providing a cost-effective, and non-invasive treatment.

Dr. Sébastien Lacroix-Desmazes, CNRS (Inserm Team UMRS 872, Immunopathology and Therapeutic Immuno-
Intervention), said, “Preventing the immune response to therapeutic proteins upon induction of tolerance is the approach of
choice for patients with hemophilia A. To date, the only strategy to induce tolerance to FVIII in patients who have developed
anti-FVIII antibodies consists in flooding the immune system with enormous amounts of FVIII every day, for periods that can
extend up to several months or years. This obviously faces issues with patients’ compliance and treatment costs. Being able
to induce FVIII-specific tolerance in hemophilia A patients using low doses of antigen, such as is the case with the Viaskin
delivery system, would drastically improve the life of alloimmunized hemophilia A patients and solve a crucial societal

Dr. Pierre-Henri Benhamou, Chairman and CEO of DBV Technologies, said, “The establishment of a partnership with Dr.
Sebastien Lacroix-Desmazes and Inserm, with their extensive expertise in Hemophilia A, can potentially open a new path for
Viaskin to become the future of hemophilia A treatment as a non-invasive, prophylactic alternative against an alloimmune
response to therapeutic Factor VIII.” Dr. Pierre-Henri Benhamou concluded: “This research should reinforce the relevance of
the Viaskin® platform, as a technology enabling deep and durable modulation of inappropriate immune responses.”

The protective effect conferred by the immunological response induced by epicutaneous immunotherapy using Viaskin®
will be tested at the humoral level, and is expected to induce tolerance to FVIII in mice with severe hemophilia A. The DBVInserm
research collaboration will last 12 months. Different mice cohorts will be treated with Viaskin containing the FVIII
protein versus placebo for 45 days. After 45 days, all mice will be subject to a protocol of replacement therapy for 4 weeks.
The levels of anti-FVIII IgG and of FVIII inhibitors will then be assessed by immunological and functional assays. Various
approaches have investigated treatments aimed at inducing tolerance to exogenous FVIII in hemophilic mice. Through the
Viaskin platform, DBV Technologies has developed a first-in-class approach to deliver antigens of choice to immunosensitized
organisms as a method to induce antigen-specific tolerance, and in this case, tolerance to therapeutic FVIII in
hemophilia A.

About Hemophilia A
Hemophilia A is a rare X chromosome-linked recessive hemorrhagic disorder that affects one individual out of 5,000—
10,000. Genetic abnormalities in the gene encoding FVIII result in the absence of production of FVIII or in the production of
defective FVIII molecules. In up to 30% of the patients, replacement therapy is complicated by the occurrence of anti-drug
antibodies, referred to as inhibitory anti-FVIII antibodies (or FVIII inhibitors), that preclude the use of FVIII as treatment.
Inhibitory anti-FVIII antibodies are of the IgG isotypes, and mostly part of the IgG1 and IgG4 subclasses. Mortality is high
and ranging between 12.5% and 22%, usually because of fatal hemorrhage.

About Inserm
Understand and improve human health
Founded in 1964, the French National Institute of Health and Medical Research (Inserm) is a public scientific and technological institute
which operates under the joint authority of the French Ministry of Health and French Ministry of Research.
As the only French public research institute to focus entirely on human health, in 2008 Inserm took on the responsibility for the
strategic, scientific and operational coordination of biomedical research. This key role as coordinator comes naturally to Inserm thanks to
the scientific quality of its teams and its ability to conduct translational research, from the laboratory to the patient’s bed.
In April 2009, national coordination was strengthened by Aviesan, the Alliance nationale pour les sciences de la vie et de la santé (French
National Alliance for Life and Health Sciences), which Inserm co-founded with other research institutes and the Conférence des
présidents d’université (Association of University Presidents).

About DBV Technologies
DBV Technologies is opening up a decisive new approach to the treatment of allergy – a major public health issue that is constantly
increasing in prevalence. Food allergies represent a true handicap in everyday life for millions of people and thus constitute a major
unmet medical need. DBV Technologies has developed a unique, proprietary, worldwide-patented technology for administering an
allergen to intact skin and avoiding massive transfer to the blood. The Viaskin® technology combines efficacy and safety as part of a
treatment that seeks to improve the patient’s tolerability of peanut and thus considerably lower the risk of a systemic, allergic reaction in
the event of accidental exposure to the allergen. The company’s significant development program has taken this revolutionary method
through to the industrial stage in Europe, initially. The product’s clinically proven safety of use enables the application of effective
desensitization techniques (the efficacy of which is acknowledged worldwide) in the most severe forms of the allergy. DBV Technologies
is focusing on food allergies (milk and peanut) for which there are currently no effective treatments. It has developed two products:
Viaskin® Peanut and Viaskin® Milk. The clinical development program for Viaskin® Peanut has received Fast Track designation from the
US Food and Drug Administration. The company will subsequently develop a Viaskin® patch for young children with house dust mite
allergy – a true public health issue because this pathology is one of the main risk factors for childhood asthma. DBV Technologies shares
are traded on segment C of Euronext Paris (Ticker: DBV, ISIN code: FR0010417345).
For more information on DBV Technologies, please visit our website: www.dbv-technologies.com

CAUTION: Viaskin® is not approved for sale in the USA.

Forward Looking Statement
The forward-looking statements, objectives and targets contained herein are based on the Company’s management strategy, current
views and assumptions. Such statements involve known and unknown risks and uncertainties that may cause actual results, performance
or events to differ materially from those anticipated herein. Furthermore, the Research and Development process involves several stages
each of which involve the substantial risk that the Company may fail to achieve its objectives and be forced to abandon its efforts with
regards to a product in which it has invested significant sums. Therefore, the Company cannot be certain that favorable results obtained
during pre-clinical trials will be confirmed subsequently during clinical trials, or that the results of clinical trials will be sufficient to
demonstrate the safe and effective nature of the product concerned. DBV technologies’ business is subject to the risk factors outlined in
its registration documents filed with the French Autorité des Marchés Financiers.

DBV Contacts
DBV Technologies
David Schilansky
Chief Financial Officer
Tél. : +33(0)1 55 42 78 75

US & UK investors
The Trout Group
Investor Relations
Alan S. Roemer
Tél. : +1 (646) 378-2945

French investors
Financial Communication and investor relations
Emmanuel Huynh / Valentine Brouchot
Tél. : +33(0)1 44 71 94 94
US press & media
Ronald Trahan Associates Inc.
Press relations
Ronald Trahan, APR
Tél. : +1 508 359 4005
Inserm Contacts
Tel. : +33(0)1 44 23 60 97