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NCT Number: NCT03682965

Texan Allergy & Sinus Center Mountain Cedar Intra-Lymphatic Immunotherapy Study

TX-SMILE is an investigator-initiated, multi-center, randomized, double-blind, parallel-group, placebo-controlled study to evaluate the efficacy, safety, and tolerability of intra-lymphatic administration of an approved allergenic extract for the immunotherapy treatment of allergic rhinitis and conjunctivitis due to pollen from the conifer Mountain Cedar.

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Key information

Conditions

Allergic Rhinitis Due to Tree Pollen Allergic Conjunctivitis Allergic Rhinoconjunctivitis Conjunctival Diseases Conjunctivitis Conjunctivitis, Allergic Eye Diseases Hypersensitivity Hypersensitivity, Immediate Immune System Diseases Nose Diseases Otorhinolaryngologic Diseases Respiratory Hypersensitivity Respiratory Tract Diseases Rhinitis Rhinitis, Allergic Rhinitis, Allergic, Seasonal

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2

Primary location

Texan Allergy & Sinus Center, Austin, Texas, United States

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About this study

TX-SMILE is an investigator-initiated, multi-center, randomized, double-blind, parallel-group, placebo-controlled study to evaluate the efficacy, safety, and tolerability of an alternative injection site and associated adjustments to dosing and treatment regimen for allergen immunotherapy with a commercially-available, FDA-approved allergenic extract for the immunotherapy treatment of allergic rhinitis and conjunctivitis due to pollen from the conifer Mountain Cedar (Juniperus ashei).

The purpose of this study is to evaluate the effect of a three-dose treatment series of ultrasonography-guided, intra-lymphatic immunotherapy injections over a two-month period prior to the start of the 2018-2019 Mountain Cedar allergy season in central Texas. Patients will be evaluated for safety and tolerability during the treatment period and for efficacy during the 2018-2019 Texas Mountain Cedar pollen season.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Both male and female adult patients with a history of Season Allergic Rhinitis (SAR) with bothersome symptoms due to Mountain Cedar pollinosis confirmed using the Modified Quantitate Test (MQT; defined as a wheal greater than or equal to 3 millimeters larger than the diluent control)
  • Patients must be willing to provide written, informed consent
  • Patients must be willing and able to comply with study procedures
  • Women of childbearing potential must agree to use an acceptable form of contraception during the trial

Exclusion criteria

  • Patients less than 18 years of age
  • Clinically-significant chronic sinusitis, as determined by the investigator
  • History of anaphylaxis during Mountain Cedar skin prick testing
  • Participation in another clinical trial or use of an experimental medication within 30 days of enrollment
  • Medically significant co-morbidities that, in the opinion of the investigator, place the subject at increased risk during the study, including but not limited to:
  • Autoimmune diseases, other than allergic rhinitis (AR), stable allergic asthma, eczema and food sensitivities
  • Pulmonary or respiratory diseases other than stable asthma
  • Cancer other than basal cell carcinoma
  • Coronary artery disease or hypertension treated with beta-blockers
  • Clinically significant impairment of renal or hepatic function
  • Use of concomitant medications that, in the opinion of the investigator, may reduce the effectiveness of rescue treatments for anaphylaxis (e.g. beta-blockers) or alter the immune response to allergen immunotherapy (e.g., immunosuppressants, systemic corticosteroids)
  • Previously completed immunotherapy for Mountain Cedar pollinosis, that in the opinion of the investigator would interfere with the assessment or treatment of the patient
  • Inability to access suitable lymph nodes for intralympahtic injections
  • Plans to leave the area for a significant period of the upcoming Mountain Cedar pollen season
  • Pregnant or lactating females

Treatment and study plan

Intra-lymphatic allergenic extract

Biological

Mountain Cedar pollen allergenic extract is an FDA-approved, commercially available product for diagnosis and hypo-sensitization treatment of allergies. The labeled use is deep subcutaneous or percutaneous injection. Hyposensitization treatment is typically a series of 30 - 70 injections over 3 - 5 years into the upper aspect of the arm. This investigation is a proof-of-concept study to evaluate an alternative hyposensitization regimen of 3 injections directly into an inguinal lymph node.

Other names: NDC02686614

Intra-lymphatic placebo

Biological

The control group will receive a regimen of 3 injections of diluent (placebo) directly into an inguinal lymph node on the same schedule as the active treatment group.

Primary outcomes

  1. Average Daily Total Combined Score (TCS)

    Time frame: Up to 4 months

    The TCS is the preferred endpoint for rhinoconjunctivitis as recommended by the European Academy of Allergy and Clinical Immunology. Scoring of the TCS is from 0 to 38 on each day that it is assessed. The TCS is the sum of the symptom scores for "runny nose", "stuff nose", "sneezing", "itchy nose", "gritty/itchy eyes", and "watery eyes" rated from no symptoms = 0 to severe symptoms = 3 plus the score for use of rescue medications for allergy symptoms 6 points for oral antihistamine, 6 points for eye drops, and 8 points for a nasal corticosteroid. Thus, a lower score represents fewer symptoms and associated need for allergy medication, while a higher score reflects more severe symptoms and the use of medication to treat symptoms. The TCS will be measured during the 2018-2019 Mountain Cedar pollen se

Secondary outcomes

  1. Number of Peak Pollen Season Days With a Lower Group Average Total Combined Score

    Time frame: Assessed up to 4 months, number of actual peak pollen season days was 27

    Evaluated during the 2018-2019 Texas Mountain Cedar allergy season. The number of days with a lower group average Total Combined Score, comparatively, in each Arm/Group are reported. Scoring of the TCS is from 0 to 38 on each day that it is assessed.The TCS is the sum of the symptom scores for "runny nose", "stuff nose", "sneezing", "itchy nose", "gritty/itchy eyes", and "watery eyes" rated from no symptoms = 0 to severe symptoms = 3 plus the score for use of rescue medications for allergy symptoms 6 points for oral antihistamine, 6 points for eye drops, and 8 points for a nasal corticosteroid. Thus, a lower score represents fewer symptoms and associated need for allergy medication, while a higher score reflects more severe symptoms and the use of medication to treat symptoms.

  2. Patient Reported Pain or Discomfort Following Intra-lymphatic Injections

    Time frame: Immediately after the ILIT procedure

    Patient reported pain will be measured immediately after ILIT procedure using the Numeric Rating Scale 11 (NRS-11 rating scale). The NRS-11 asks patients to rate their pain on a scale from 0 (no pain or discomfort) to 11 (worst possible pain).

  3. Patient-reported Treatment Satisfaction at the End of Study

    Time frame: Up to 4 months

    Percentage of patients reporting satisfaction with their treatment

  4. Percentage Change in Allergen-specific Serum IgE

    Time frame: Assessed prior to the first injection and to 4-8 weeks after the end of the 2018-2019 pollen season

    Percentage change in allergen-specific serum IgE from baseline to the end-of-study visit between active ILIT and placebo.

  5. Total Safety Score (TSS) for Active and Placebo Treatment Groups

    Time frame: 8 weeks

    The total safety score is a is based on World Allergy Organization grading for allergic reactions. Following allergen or placebo exposure via intra-lymphatic injection, patients are monitored for local and systemic allergic reactions for up to 60 minutes post-procedure. At each exposure, a score is rated on a scale from none = 0, local reactions only = 1, mild systemic reactions (WAO Grade 1/2) = 2, moderate systemic reaction (WAO Grade 3) = 3, and severe systemic reaction (WAO grade 4) = 4. The total safety score for each group is the sum of the individual scores of each patient across all three treatments (exposures). Thus, the subject may have a score from 0 to 12 with 0 reflecting no allergic reaction to the allergen and 12 reflecting severe allergic reactions, and the TSS for a group is the sum for all patients in the group. The TSS is used to elicit and grade adverse events of interest rather than for statistical analysis.

  6. Number of Subjects Who: Experienced Anaphylaxis, Were Treated With Epinephrine, or Experienced Any Other Treatment-emergent SAE Within 60 Minutes of Any of Three Planned ILIT Procedures

    Time frame: 8 weeks

    To evaluate the safety of ILIT for Mountain Cedar pollinosis relative to placebo control based on the proportion of subjects receiving allergenic extract versus the proportion of subjects receiving placebo that:

    • experience anaphylaxis, or
    • are treated with epinephrine, or
    • experience any other treatment-emergent, serious adverse event (SAE) within 60 minutes of any of the three planned ILIT procedures.

Other outcomes

  1. Total Number of Rescue Inhaler Uses by Patients With Asthma

    Time frame: Up to 4 month

    Relative use of rescue inhalers by patients with comorbid asthma between active and placebo groups during the 2018-2019 Mountain Cedar pollen season.

Sponsors and collaborators

Lead sponsor

Christopher Thompson, MD

Other

Registry information

Acronym: TX-SMILE

Important dates

Study start
2018
Primary completion
2019
Study completion
2019
First posted
Sep 25, 2018
Registry last updated
Apr 20, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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