The Effect of Omalizumab on Responses to Cat Allergen Challenge

This is an interventional basic science trial for Allergic Rhinitis focused on measuring Basophils, Mast Cells, IgE, IgE receptors, omalizumab Read More

Inclusion Criteria:

• Ability to understand and provide informed consent
• Male or Female (non-pregnant), age 18-50
• Females must be: Surgically sterile (hysterectomy, bilateral oophorectomy, bilateral tubal ligation), OR postmenopausal (at least 1 year since last menses), OR using a medically acceptable form of birth control throughout the duration of the study.
• Clinical history of seasonal or perennial allergic rhinitis for at least two years, with or without mild persistent asthma
• Positive puncture skin test greater than or equal to 5 mm diluent control
• Positive Immunocap to Fel d 1 > 0.35 kallikrein unit/L
• Positive intranasal cat allergen challenge as defined by > 5 sneezes or a tripling of measured nasal lavage mediators
• In vitro assay of basophil responsiveness to cat allergen with greater than 20% histamine release
• The use of antihistamines, cromolyn, leukotriene modifiers and other non-steroid (astelin and topical decongestants), nasal medications will be allowed, but they will be withheld for 5 days prior to each nasal allergen provocation session. Inhaled corticosteroids for mild asthma will be permissible.
• No known contraindications to therapy with omalizumab

Exclusion Criteria:

• Asthma with forced expiratory volume at one second (FEV1) < 80%, moderate to severe asthma classification per National Asthma Education and Prevention Program Expert Panel (NAEP) Standards (1997 National Asthma Education and Prevention Program Expert Panel Report II guidelines)
• Serum IgE levels less than 30 IU/mL or greater than 700 IU/mL at the time of enrollment will be excluded
• Unexplained elevation of erythrocyte sedimentation rate (ESR), hematocrit < 32%, white blood cell (WBC) count 2400/microliter lower limit of normal, platelet < 75000/microliter, creatinine > 141.4 micromolar/L, or aspartate aminotransferase (AST) > 100 IU/L
• Body weight less than 30 kg or greater than 150 kg will be excluded.
• Plans to become pregnant or breastfeed will be excluded from the study
• A perforated nasal septum, structural nasal defect, large nasal polyps causing obstruction, evidence of acute or chronic sinusitis
• A life expectancy less than 6 months
• A terminal illness as determined by the investigator
• A history of malignancy, anaphylaxis or bleeding disorder are also exclusion illnesses.
• Mental illness or history of drug or alcohol abuse that, in the opinion of the investigator, would interfere with the participant's ability to comply with study requirements.
• Inability or unwillingness of a participant to give written informed consent or comply with study protocol
• Use of any investigational drugs within 8 weeks of participation
• Contraindications to omalizumab include patients with a previous hypersensitivity to omalizumab
• Recent recipient of any licensed or investigational live attenuated vaccine(s) within two months of study initiation such as flu mist.
• Prior use of omalizumab
• Frequent sinusitis (>2/ documented episodes per year) or active sinusitis within 2 weeks of enrollment
• Use of immunotherapy within the last 5 years