Efficacy and Safety Study of TOLAMBA™ in Ragweed-Allergic Adults

Ragweed allergy is the most common seasonal allergy in North America. Allergen immunotherapy
is a therapeutic option for patients who have allergy symptoms that cannot be adequately
controlled by avoidance of the allergen or medication. It may also be appropriate for those
who cannot tolerate their medications due to side effects or have difficulties with
medication compliance. This study compares the safety and efficacy of two different dosing
regimens of TOLAMBA™ with placebo in reducing the symptoms of ragweed-allergic adults over
two consecutive ragweed pollen seasons.

Comparison(s): Subject-rated allergy symptoms of subjects treated with TOLAMBA™ dose-intense
regimen or TOLAMBA™ lower-dose regimen, compared with subjects treated with placebo.

Inclusion Criteria:

- Has a history of ragweed allergic rhinitis (hayfever) during at least the last 2
consecutive seasons that has required treatment with antihistamines, decongestants
and/or nasal steroids, but where symptom relief has been incomplete

- Is willing to stay in their ragweed area during the historical peak period of the
local ragweed season, and willing to travel for no more than 2 weeks (cumulative time)
outside of their ragweed area during the entire season

Exclusion Criteria:

- Has had any hospital admissions for asthma

- Has smoked within the past year, or has a ≥10-pack per year smoking history

- Has had any previous immunotherapy with ragweed pollen extract, or was in a previous
clinical trial with TOLAMBA™

- Has used Xolair within the past 12 months

- Has a history of anaphylaxis