Randomized, double-blind placebo-controlled phase I trial with the primary aim to investigate safety and tolerability of three ascending dosing schemes of DM-101-PX in birch pollen allergic adults. As an explorative objective, the trial will also investigate the effect of DM-101PX on the allergic symptoms following birch pollen allergen exposure in a chamber. Expanded access to the study treatment is not available.

The study will be carried out in a single study site located in Canada

Inclusion Criteria:

• Either sex or any race, aged 18 to 65 years
• Good general health
• A documented clinical history of moderate to severe birch pollen induced allergic rhinitis or rhinoconjunctivitis with symptoms that interfere with daily activities or sleep and remain bothersome despite the use of relevant symptomatic medication, and have been present over at least 2 previous birch pollen seasons
• Birch pollen specific IgE ≥ 0.7 kU/L
• Positive SPT to birch pollen allergen, with wheal diameter ≥ 3 mm
• Body weight ≥ 50 kg and body mass index within the range of 18-35 kg/m2

Exclusion Criteria:

• History or findings on physical examination of any significant disease or disorder which, in the opinion of the Investigator, could put the subject at risk because of participation in the trial, influence the results of the trial or subject's ability to participate in the trial
• Current diagnosis of persistent asthma, or moderate to severe asthma requiring GINA Step 2 or higher treatment, or asthma partially controlled or uncontrolled according to GINA classification in the 6 months before screening
• Significant rhinitis, sinusitis, significant and/or severe allergies not associated with the birch pollen season
• History of asthma deterioration that resulted in emergency treatment or hospitalization in the past 12 months before screening, or a life-threatening asthma attack at any time in the past
• A Forced Expiratory Volume in one second (FEV1) ≤ 75% of predicted value
• History of severe drug allergy, severe angioedema, or systemic allergic reaction of Grade 3 or grater, according to World Allergy Organization (WAO) scale, due to any cause

All individual participant data that underlie publicly available results will be considered for sharing

Anonymized participant data will be considered for sharing once the indication has been approved by a regulatory body, if there is legal authority to share the data and there is not a reasonable likelihood of participant re-identification.

Qualified researchers may request access to patient level data and related study documents: patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants. Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants after Desentum has received marketing authorization from major health authorities (e.g. FDA, EMA), has the legal authority to share the data, and has made the study results publicly available.

Double (Participant, Investigator)