Follow-up of the VIPES Study to Evaluate Efficacy and Safety of Viaskin Peanut in Adults and Children

Peanut allergy is a common allergy in the United States, with a prevalence in the general
population as high as 1%. So far, there is no approved treatment of peanut allergy. Peanut
allergy management is based on strict peanut avoidance and injectable epinephrine after the
allergic systemic reactions have started. Specific Immunotherapy methods currently available
have shown some limitations in their use because of safety issues. Hence, there is an
important unmet medical need for efficient and safe treatment of peanut allergy.

DBV Technologies has developed an epicutaneous delivery system, called Viaskin, a method
based on delivering precise quantity of the allergen on the upper layers of the skin.
Avoiding contact between the allergen and the bloodstream should confer to epicutaneous
immunotherapy (EPIT) a higher level of safety as systemic reactions should be circumvented

The OLFUS-VIPES study is an open-label follow-up study for subjects who previously were
randomized and have completed the VIPES efficacy and safety study. Subjects will be offered
enrollment in this follow-up study to receive an additional 24 months of Viaskin Peanut
treatment followed by a period of 2 months without treatment while maintaining a peanut-free
diet.

The trial will be conducted at the same sites as the VIPES study with investigators and staff
trained and experienced in the diagnosis and the management of peanut allergy and
anaphylaxis, and who are capable of performing a double-blind placebo-controlled food
challenge (DBPCFC) in adult and/or pediatric subjects.

According to the current amended study protocol, all subjects enrolling into the OLFUS-VIPES
study after having completed the VIPES study will receive the highest dose of Viaskin Peanut,
i.e. 250 mcg peanut protein, regardless of prior treatment (placebo, 50 mcg, 100 mcg or 250
mcg Viaskin Peanut) they were receiving in the VIPES study. Subjects who already enrolled
into the OLFUS-VIPES study under the initial protocol design will all switch to receive the
250 mcg dose at Month 6 or at Month 12 of treatment in the OLFUS-VIPES study upon approval of
the amended protocol at their sites. The study will remain blinded for all subjects until the
VIPES study is unblinded. All subjects completing the OLFUS-VIPES study should receive
overall 24 months of active treatment followed by a period of 2 months without treatment for
those subjects being assessed for sustained unresponsiveness.

Inclusion Criteria:

- Adult and pediatric subjects (≥7 years) who completed the VIPES study, with a
mandatory and documented DBPCFC at Month 12 in the VIPES study.

- Signed informed consent from adult subjects or parent(s)/guardian(s) of children <18
years and children's assent for children >7 years or as per country-specific
regulations or laws. This consent should be signed no later than Visit 11 in the VIPES
study.

- Negative pregnancy test for women of childbearing potential at Visit 10 in the VIPES
study.

- Female subject of childbearing potential must use effective methods of contraception
to prevent pregnancy and agree to continue to practice an acceptable method of
contraception for the duration of participation in the study. Documented sexual
abstinence will be accepted as an effective method of contraception for girls below 15
years of age.

- Subjects and/or parents/guardians willing to comply with all study requirements during
their participation in the study.

Exclusion Criteria:

- Severe reaction during the DBPCFC at Month 12 in the VIPES study, defined as need for
intubation, hypotension persisting after epinephrine administration, and/or the need
for more than two doses of epinephrine.

- Pregnancy or lactation.

- Females of childbearing potential planning a pregnancy in the coming 2 to 3 years.

- Subjects who became allergic to chocolate or who do not want to consume the chocolate
study challenge vehicle anymore.

- Subjects who developed hypersensitivity to excipients of the Viaskin patches or of the
food challenge formula used during the VIPES study.

- Inability to discontinue short-acting antihistamines for three days or long-acting
antihistamines for five to seven days (depending on half-life) prior to skin prick
testing or food challenges.

- Subjects with asthma that has evolved and now fulfills any of the criteria defined as
follows:

- uncontrolled persistent asthma by National Asthma Education and Prevention
Program Asthma guidelines (2007) or by Global Initiative for Asthma (2011) or
being treated with combination therapy of medium dose inhaled corticosteroid with
a long acting inhaled β2-agonists.

- at least two systemic corticosteroid courses for asthma in the past year or one
oral corticosteroid course for asthma in the past three months.

- prior intubation for asthma in the past year.

- Subjects receiving β-blocking agents, angiotensin-converting enzyme inhibitors,
angiotensin-receptor blockers, calcium channel blockers or tricyclic antidepressant
therapy.

- Subjects receiving or planning to receive anti-tumor necrosis factor drugs or anti-IgE
drugs (such as omalizumab) or any biologic immunomodulatory therapy.

- Subjects receiving or planning to receive any type of immunotherapy to any food (e.g.
oral immunotherapy, sublingual immunotherapy, specific oral tolerance induction)
during their participation in the study.

- Subjects receiving or planning to receive any aeroallergen immunotherapy during their
participation in the study.

- Allergy or known history of reaction to Tegaderm® with no possibilities to use an
alternative dressing approved by the sponsor.

- Subjects suffering from generalized dermatologic disease (e.g. severe atopic
dermatitis, uncontrolled generalized eczema, ichthyosis vulgaris) with no intact zones
to apply the patches.

- Any new disorder in which epinephrine is contraindicated such as coronary artery
disease, uncontrolled hypertension, or serious ventricular arrhythmias.

- A history of non compliance in the VIPES study. Non compliance is defined as subjects
not applying the patch at all for 60 days or more (this can be either consecutive or
intermittent non-application of the patches) during the whole VIPES study duration

- Participation in another clinical intervention study in the past year, other than the
VIPES study.

- Subjects on any experimental drugs in the past year, other than those used in the
VIPES study.

Other inclusion/exclusion criteria may apply.