Glycyphagus Domesticus Allergen Extract. Determination of the in Vivo Biological Activity in Histamine Equivalent Units (HEP).

NCT ID: NCT00917488

Last Updated: 2011-06-20

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE2
• Total Enrollment: 27 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2009-05-31
• Study Completion Date: 2010-07-31

Brief Summary

The main purpose of the trial is to prove the therapeutic value of the product and enable an effective and safe dosage schedule to be recommended

Detailed Description

The objective of this study is to determine the biologic activity of a Glycyphagus domesticus allergen extract in histamine equivalent prick (HEP) units, in order to be used as in-house reference preparation (IHRP).

The skin testing procedure, based on the Nordic Guidelines is the reference method for the biological calibration of in-House Reference Preparations (IHRP). The method is not intended for routine testing of allergen extracts. The use of this procedure is the basis for the definition of biological activity units: "the activity of an allergen extract is 10,000 Biological Units (BU) per ml (10 HEP per ml), when the extract provokes an specific skin reaction in the median sensitive patient with a wheal of the same size as a wheal provoked by a positive reference solution consisting of histamine 54.3 mmol/l (for example histamine dihydrochloride 10 mg/ml), when both solutions are administrated using the same technique (prick testing) on at least 20 individuals who are clinically allergic and cutaneously reactive to the allergen concerned".

Conditions

Rhinitis, Allergic, Seasonal; Conjunctivitis, Allergic

Study Design

• Allocation Method: NON_RANDOMIZED
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: DIAGNOSTIC
• Blinding Strategy: NONE

Study Groups

A

Four concentrations of Glycyphagus domesticus allergen extract, together with a positive and negative control, using 10 mg/ml histamine dihydrochloride solution and a glycerinated phenol saline solution, respectively, was tested in every patient in duplicate on the volar surface of the forearm.

Group Type: EXPERIMENTAL

Standardization of allergenic extract (Gly. domesticus)

Intervention Type: OTHER

Allergenic extract for cutaneous prick-test

Interventions

Standardization of allergenic extract (Gly. domesticus)

Allergenic extract for cutaneous prick-test

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

1. A documented positive case history with inhalation allergy (rhinitis and/or rhinoconjunctivitis and/or asthma) related to Glycyphagus domesticus.

2. Positive skin prick test with an available preparation of the same allergen extract (a wheal major diameter of at least 3 mm) and/or a positive test for specific IgE.

3. Mean of the areas of the wheals provoked by histamine dihydrochloride (10 mg/ml) ≥ 7 mm2.

4. Age ≥ 18 years and ≤ 50 years

5. Subject can be male or female

6. Subject must be capable of providing written informed consent

Exclusion Criteria

1. Subjects should not be excluded due to low or high sensitivity to Glycyphagus domesticus.

2. Immunotherapy in the past 2 years with an allergen preparation known to interfere with the allergens to be tested.

3. Use of drugs that may interfere with the skin reactions.

4. Pregnancy, dermographism, atopic dermatitis (locally at the test site), urticaria.

5. Any disease which prohibits the use of adrenaline (hyperthyroidism, arterial hypertension, cardiopathy, etc.)

6. Lack of cooperation which may interfere with the study, or subjects with severe psychiatric, psychological or neurological disorders.

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 50 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Laboratorios Leti, S.L.

INDUSTRY

Sponsor Role: lead

Responsible Party

Laboratorios LETI S.L.Unipersonal

Principal Investigators

Francisco Moreno, MD, PhD

Role: PRINCIPAL_INVESTIGATOR

Locations

Clinica Dr. Lobatón

Cadiz, Cadiz, Spain

Countries

Spain

Other Identifiers

2007-000904-33

Identifier Type: EUDRACT_NUMBER

Identifier Source: secondary_id

108-PR-PRI-147

Identifier Type: -

Identifier Source: org_study_id