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

The objectives of this open-label follow-up study for subjects who previously were randomized and have completed the VIPES study for the treatment of peanut allergy, are: * To assess the efficacy of Viaskin Peanut after up to 36 months of treatment. * To evaluate the safety of long-term treatment with Viaskin Peanut. * To evaluate sustained unresponsiveness to peanut after a period of 2 months without treatment in subjects showing desensitization to peanut after treatment with Viaskin Peanut.

Peanut allergy is a common allergy in the United States, with a prevalence in the general population as high as 1%. 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.