A Study to Evaluate Safety, Tolerability and Immune Response in Adolescents Allergic to Peanut After Receiving Intradermal Administration of ASP0892 (ARA-LAMP-vax), a Single Multivalent Peanut (Ara h1, h2, h3) Lysosomal Associated Membrane Protein DNA Plasmid Vaccine

Inclusion Criteria:

- Subject has a body mass index (BMI) ≥ 3rd percentile and ≤ 97th percentile.

- Subject has a physician-diagnosed peanut allergy or history of peanut allergy.
Subjects with history of nonsevere anaphylaxis (Grade ≤ 3) to peanuts (including mild
wheezing or dyspnea without hypoxia) will be enrolled.

- Subject has an anti-Ara h2 Immunoglobulin E (IgE) measured by ImmunoCAP > 0.35 kU/L.

- Subject has a positive Skin prick test (SPT) to peanut with a change in wheal diameter
≥ 3 mm as compared to a negative control.

- Subject has a positive peanut Double-blinded placebo-controlled food challenge
(DBPCFC) at Screen 2 visit with an eliciting dose ≤ 300 mg peanut protein (≤ 444 mg
cumulative reactive dose [CRD]).

- Female subject must either:

- Be of non-childbearing potential, clearly premenarchal; documented surgically
sterile (e.g., hysterectomy, bilateral salpingectomy, bilateral oophorectomy).

- Or, if of childbearing potential, agrees not to try to become pregnant during the
study; and have a negative urine pregnancy test at screening and at day 1
(predose); and if heterosexually active, agrees to consistently use 1 form of
highly effective birth control starting at screening and throughout the study
period.

- Female subject must agree not to breastfeed starting at screening and throughout the
study period, and for 28 days after the final study drug administration.

- Female subject must not donate ova starting at screening and throughout the study
period, and for 28 days after the final study drug administration.

- A heterosexually active male subject with female partner(s) who are of childbearing
potential is eligible if:

- Agrees to use a male condom starting at screening and continue throughout study
treatment and for 28 days after the final study drug administration. If the male
subject has not had a vasectomy or is not sterile, the subjects female partner(s)
is utilizing 1 form of highly effective birth control starting at screening and
continue throughout study treatment and for 90 days after the male subject
receives his final study drug administration.

- Male subject must not donate sperm starting at screening and throughout the study
period, and for 90 days after the final drug administration.

- Subject and subject's parent(s) or legal guardian agree that the subject will not
participate in another interventional study while participating in the present study.

Exclusion Criteria:

- Subject has severe anaphylaxis to peanuts (Grades 4 or 5 including dyspnea associated
with hypoxia, cyanosis, hypotension or neurological compromise) per the Grading of
Food-Induced Anaphylaxis According to Severity of Clinical Symptoms based on
historical clinical symptoms.

- Subject develops a Grade 4 or 5 reaction during the DBPCFC, per the Grading of Food-
Induced Anaphylaxis According to Severity of Clinical Symptoms based on historical
clinical symptoms.

- Subject has received or is planning to receive administration of any vaccine (other
than injectable Influenza vaccine) within 28 days prior to the administration of the
study vaccine or at any time during the study.

- Subject received any specific immunotherapy for allergy (e.g., epicutaneous
immunotherapy [EPIT], sublingual immunotherapy [SLIT], Subcutaneous immunotherapy
[SCIT] and oral immunotherapy [OIT]) during the past 12 months, currently or plans to
receive during the course of the study.

- Subject has used the following drug(s) prior to the dosing of the study vaccine:

- Within 2 months prior to study vaccine administration: Systemic (or inhaled)
steroid, chemical mediator-isolation inhibitor, T helper cell type 2 (Th2)
cytokine inhibitor, thromboxane A2 synthesis inhibitor, thromboxane A2 receptor
antagonist, β-blocker, angiotensin-converting enzyme inhibitors and/or
angiotensin-receptor blockers

- Within 3 months prior to study vaccine administration: Biologics and/or immune
modulators (including anti-TNFα antibody and anti-IgE monoclonal antibody)

- Subject has history of allergic reactions such as anaphylactic shock, angioedema with
airway constriction or hypotension caused by food other than peanut and/or medical
products (including vaccine) in the past.

- Subject's laboratory test results at screening or prior to study drug dosing on day 1
are outside the normal limits and are considered clinically significant.

- Subjects with anti-Lysosomal associated membrane protein (LAMP)-1 antibodies above the
cut-point for the Tier 1 assay and who are confirmed positive in the Tier 2 assay at
Screen 1 visit (baseline).

- Subject had a positive test result for hepatitis B surface (HBs) antigen, hepatitis C
virus (HCV) antibody or human immunodeficiency virus (HIV) antigen/antibody.

- Subject had a positive urine drug screen result.

- Subject has immune disorders (including autoimmune disease) and/or diseases requiring
immunosuppressive drugs.

- Subject was diagnosed with immunodeficiency in the past.

- Subject has uncontrolled hypertension.

- Subject has a history of cardiovascular disease, arrhythmias, chronic lung disease,
active eosinophilic gastrointestinal disease or any other medical or surgical
conditions, which, places the subject at increased risk for participation in the
study.

- Subject has a complication or medical history of respiratory disease, which requires
medical treatment.

- Subject has a complication or medical history of malignant tumor.

- Subject has mental conditions such as schizophrenia, bipolar disorder, dementia and
major depressive disorder.

- Subject has severe or poorly controlled atopic dermatitis or generalized eczema.

- Subject is unable to discontinue antihistamines within 7 days or 5 half-lives
(whichever duration is longer) prior to SPT and oral food challenge procedures.

- Subject has asthma other than mild intermittent asthma (National Heart, Lung and Blood
Institute [NHLBI] Guidelines, July 2007) and has a forced expiratory volume in 1
second value < 80% and/or requiring chronic maintenance treatment (i.e., inhaled
corticosteroids).

- Subject has already received injection of Lysosomal associated membrane protein
(LAMP)-vax such as ASP0892.

- Subject has received investigational therapy within 35 days or 5 half-lives, whichever
is longer, prior to screening.

- Subject's parent(s) or legal guardian is an employee of the Astellas Group or vendors
involved in the study.

- Subject has any condition, which, makes the subject unsuitable for study
participation.