Clinical trial NCT00599872: Efficacy Study of Sublingual Immunotherapy to Treat Ragweed Allergies
Official title: Parallel, Randomized, Double-Blind, Placebo-Controlled Trial in Adults for the Sublingual-Oral Immunotherapy (SLIT) of Allergic Rhinoconjunctivitis With or Without Asthma Caused By Ragweed Pollen
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE3
Conditions: Allergic Rhinitis
Keywords: Allergy
Sublingual Immunotherapy
Allergic Rhinitis
Lead sponsor: Greer Laboratories
Sponsor class: INDUSTRY
First posted: 2008-01-24
Enrollment: 430
Sex: ALL
Minimum age (years): 18
Maximum age (years): 50
Standard ages: ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: The purpose of this study is to determine an effective dose range for the administration of ragweed allergenic extract via the sublingual route of administration

Detailed description: Specific allergen immunotherapy as currently practiced in the USA and described in product labeling comprises the subcutaneous injection of incrementally increasing doses to a targeted maintenance dose ("build-up") followed by maintenance injections of allergenic extract/vaccine. Up to 30-40 injections may be required during the build-up phase over a 3-6 month period. When adequate maintenance doses are reached, this form of immunotherapy (SCIT) has been shown to be highly effective and safe.

Standard practices recommend that the injections be given under the supervision of trained physicians and that the patient remain in the physician's office at least 20 to 30 minutes after an injection. The administration of immunotherapy injections are not recommended at home because of the risk of inadequate recognition and treatment of systemic reactions. The inconvenience and expense of traveling for allergy injections and the discomfort of the repeated injections is a disincentive to this form of treatment particularly in pediatric patients. For example, dropout rates exceeding 50% over a multi-year course of injection treatment have been reported.

Alternative routes for immunotherapy have been explored, especially in Europe in an attempt to improve patient compliance and to minimize the risk of serious adverse reactions. For example, sublingual-oral immunotherapy (SLIT), which is the administration of the allergenic extract/vaccine under the tongue for 1-2 minutes followed by swallowing, has been proven to be efficacious and safe in several double-blind, placebo-controlled studies. A recent Cochrane Review concluded, "SLIT is a safe treatment, which significantly reduces symptoms and medication requirements in allergic rhinitis."

Efficacy studies support the use of SLIT for the treatment of rhinitis or rhinitis and asthma. However, dosage schedules are highly variable and optimal maintenance doses have not yet been established. Thus, dosing studies should be designed to investigate not only the safety profile but to determine optimal doses for maintenance therapy of patients built-up by injection IT and for build-up regimens of previously untreated patients.

Much of the United States medical community's hesitation to embrace sublingual immunotherapy as a viable treatment option for allergy patients has stemmed from limited information using U.S. licensed allergenic extracts for this treatment route. Additionally, the cost-effectiveness of one form of therapy over the other has not been clearly evaluated and the third-party payers have not accepted SLIT for insurance coverage.

Eligibility criteria: Inclusion Criteria:

* Adult ragweed-sensitive Subjects with allergic rhinoconjunctivitis with or without asthma during ragweed pollen season.
* Subjects must be 18 to 50 years of age.
* Test Subjects will have a history of moderate to severe isolated or unseasonal allergic rhinoconjunctivitis with or without mild intermittent asthma symptoms attributable to ragweed pollen for a minimum of 2 years before study entry.
* Subjects with or with out a history of asthma will possess FEV1 and PEF greater than or equal to 80% predicted at the beginning of the study established by spirometry and defined by the Knudson predicted set.
* Sensitivity to the relevant allergen will be documented by a positive skin prick test result performed along with negative (saline) and positive (histamine) control skin tests. A positive test will be defined as the skin reaction having the longest wheal diameter of 5mm or greater or the longest erythema diameter of 10 mm or greater at 15-20 minutes after application.
* All female Subjects of child-bearing potential will be required to provide a urine sample for pregnancy testing that must be negative before being allowed to participate in the study.
* Subjects must be planning to remain in the study area during the trial (see exclusion criteria # 14).
* Subjects must be trained on the proper use of the EpiPen, and sign the EpiPenTraining Form before being allowed to enroll in the study.
* Subjects must be mentally and physically capable of self-administering oral drug.

Exclusion Criteria:

* Subjects having a history of anaphylaxis or history consistent with persistent asthma
* Subjects taking antihistamines or nasal steroids medications greater than twice a week in the months of January and/or February.
* Subjects with chronic sinusitis unstable angina, significant arrhythmia, uncontrolled hypertension, or other chronic or immunological diseases that in the opinion of the investigator might interfere with the evaluation of the test drug or pose additional risk to the Subject.
* Subjects having perennial or structurally related rhinitis or rhinitis medicamentosa (from excessive use of nasal decongestants) that will interfere with the evaluation of symptoms due to ragweed allergy.
* Subjects with an FEV1 or PEF less than 80% predicted (moderate persistent asthma) with or without controller medication.
* Subjects who have received an experimental drug in the 30 days prior to admission into this study or who plan to use an experimental drug during the study.
* Subjects who have received Anti-IgE medications (Xolair) or similar compounds in the last 12 months.
* Subjects who have received ragweed allergen immunotherapy in the last 3 years prior to admission into this study.
* Subjects who are current users of inhaled, oral, intramuscular, intravenous corticosteroids, tricyclic antidepressants, beta blockers, or MAO inhibitors.
* Subjects using beta-agonist more than twice a month unless being taken prior to exercise.
* Subjects using medications that could induce adverse gastrointestinal reactions during the study. Subjects using such medications must prove stable with no side effects for at least 3 months prior to enrollment.
* Subjects refusing to sign the EpiPen Training Form will be excluded from the study.
* Pregnant or breast feeding females.
* Subjects who plan to leave the study area for more than 2 consecutive weeks during the study.
* Subjects with a positive skin prick test to cat and/or dog, and own the pet(s) to which they are allergic.
* Subjects who sleep during the day due to working third shift.
* Subjects unable to achieve dose #2 or higher during preliminary dosing will be excluded.

Primary outcomes:
measure: Scores on a Scale (Average of Daily Rhinoconjunctivitis Symptom Score (RSS) Recorded During the Ragweed Season
timeFrame: Ragweed pollen season, 08/01/08 to 10/30/08, approximately 3 months
Secondary outcomes:
measure: Scores on a Scale (Average Daily RSS During the Highest Pollen Count Week)
timeFrame: 09/01/2008-09/07/2008
measure: Scores on a Scale (Average Daily AM RSS and the Average Daily PM RSS During the Ragweed Season)
timeFrame: Ragweed pollen season 08/01/08 to 10/30/08
measure: Scores on a Scale (Average Daily RSS During the Ragweed Season for Each of the Three Organ) Systems (Ocular, Nasal, Ears);
timeFrame: Ragweed pollen season 08/01/08 to 10/30/08
measure: Scores on a Scale (Total Allergy Relief Medication Score During the Ragweed Season) for Each Subject
timeFrame: Ragweed pollen season 08/01/08 to 10/30/08
measure: Scores on a Scale (The Average Combined Allergy Symptom and Medication Score During the Ragweed Season for Each Subject)
timeFrame: Ragweed pollen season 08/01/08 to 10/30/08
Other outcomes:
Locations:
city: Normal
country: United States
facility: Sneeze, Wheeze, & Itch Associates
state: Illinois
city: Evansville
country: United States
facility: Welborn Clinic
state: Indiana
city: Iowa City
country: United States
facility: Iowa Clinical Research Corporation
state: Iowa
city: Iowa City
country: United States
facility: University of Iowa Hospitals and Clinics
state: Iowa
city: Overland Park
country: United States
facility: College Park Family Care Center
state: Kansas
city: Overland Park
country: United States
facility: Kansas City Allergy and Asthma
state: Kansas
city: Louisville
country: United States
facility: Family Allergy and Asthma Respiratory Institute
state: Kentucky
city: Minneapolis
country: United States
facility: Clinical Research Institute
state: Minnesota
city: Rolla
country: United States
facility: Clinical Research of the Ozarks
state: Missouri
city: St. Louis
country: United States
facility: Midwest Clinical Research, LLC
state: Missouri
city: Lincoln
country: United States
facility: Asthma, Immunology and Allergy Association, LLC
state: Nebraska
city: Omaha
country: United States
facility: Midwest Allergy and Asthma Clinic, PA
state: Nebraska
city: Omaha
country: United States
facility: Creighton University
state: Nebraska
city: Brick
country: United States
facility: Ocean Allergy and Respiratory Research Center
state: New Jersey
city: Summit
country: United States
facility: Pulmonary and Allergy Associates, PA
state: New Jersey
city: Canton
country: United States
facility: Allergy and Respiratory Center
state: Ohio
city: Cincinnati
country: United States
facility: Bernstein Clinical Research Center
state: Ohio
city: Cleveland
country: United States
facility: Cleveland Clinic
state: Ohio
city: Sylvania
country: United States
facility: Toledo Center for Clinical Research
state: Ohio
city: Oklahoma City
country: United States
facility: Oklahoma Allergy & Asthma Clinic, PC
state: Oklahoma
city: Oklahoma City
country: United States
facility: Allergy, Asthma and Clinical Research Center
state: Oklahoma
city: Bethlehem
country: United States
facility: Valley Clinical Research Center
state: Pennsylvania
city: Blue Bell
country: United States
facility: Allergy and Asthma Specialists, PC
state: Pennsylvania
city: Pittsburgh
country: United States
facility: Allegheny General Hospital
state: Pennsylvania
city: Upland
country: United States
facility: Asthma and Allergy Research Associates
state: Pennsylvania
city: Nashville
country: United States
facility: Vanderbilt ASAP Research
state: Tennessee
city: Dallas
country: United States
facility: Pharmaceutical Research & Consulting, Inc
state: Texas
city: Greenfield
country: United States
facility: Allergy, Asthma and Sinus Center, SC
state: Wisconsin
city: Madison
country: United States
facility: University of Wisconsin
state: Wisconsin
city: Milwaukee
country: United States
facility: Aurora Advanced Healthcare, Inc
state: Wisconsin
Study officials:
affiliation: Greer Laboratories, Inc.
name: Robert E. Esch, PhD
role: STUDY_DIRECTOR
References: