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Nasal cytology identifies allergic rhinitis phenotypes for managing allergen immunotherapy in clinical practice

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Abstract

Backgrounds

Allergic rhinitis (AR) and non-allergic rhinitis with eosinophils (NARES) share type 2 inflammation characterized by nasal eosinophilic infiltrate. Allergen immunotherapy (AIT) is the unique specific treatment for AR, but some patients do not respond. AIT failure may depend on possible comorbidity, mainly concerning NARES.

Methods

In all, 33 patients (15 men, mean age 44 years) with AR due to house dust mites allergy were enrolled and treated with sublingual AIT using a monomeric allergoid (LAIS). AIT lasted 3 years. Symptom perception was assessed by visual analog scale (VAS). Symptoms included nasal obstruction, rhinorrhea, sneezing, cough, and olfaction. Nasal cytology evaluated the presence of eosinophils. Patients were evaluated at baseline, after 6 months, and after 1, 2, and 3 years.

Objective

The current study aimed at investigating the role of nasal cytology in identifying non-responders to AIT.

Results

A total of 28 patients significantly (p < 0.001) improved already after 6 months and showed a progressive reduction of eosinophilic infiltrate (p < 0.001). The 5 non-responder patients continued to experience symptoms, and consistent nasal inflammation did not disappear.

Conclusion

Nasal cytology is a fruitful tool to identify non-responder to AIT and phenotype mixed rhinitis, such as AR associated with NARES. Therefore, nasal cytology is useful in AIT management, mainly in non-responders.

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Abbreviations

AIT:

Allergen immunotherapy

AR:

Allergic rhinitis

CRSwNP:

Chronic rhinosinusitis with nasal polyps

MGG:

May-Grünwald-Giemsa

NAC:

Nasal allergen challenge

NARES:

Non-allergic rhinitis with eosinophils

NC:

Nasal cytology

SEM:

Standard error of mean

SLIT:

Sublingual immunotherapy

VAS:

Visual analog scale

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Funding

The study had no funding.

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Correspondence to Giorgio Ciprandi.

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Conflict of interest

P. Luperto, S. Masieri, C. Cavaliere and G. Ciprandi declare that they have no competing interests. E. Compalati and F. Frati are employers of Lofarma and only provided statistical analysis of the data.

Ethical standards

For this article no studies with human participants or animals were performed by any of the authors. All studies performed were in accordance with the ethical standards indicated in each case.

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Luperto, P., Masieri, S., Cavaliere, C. et al. Nasal cytology identifies allergic rhinitis phenotypes for managing allergen immunotherapy in clinical practice. Allergo J Int 31, 51–55 (2022). https://doi.org/10.1007/s40629-021-00188-0

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