Course of respiratory allergy by treatment strategy based on German routine data

Care with allergen immunotherapy for allergic respiratory diseases in Germany-Predictors and deficits

BACKGROUND

Allergen immunotherapy (AIT) represents the only possibility of causal therapy for allergic respiratory diseases. Although the prevailing high prevalence of allergic diseases and restrictions in the daily lives of patients, AIT is offered to a suboptimal number of patients in Germany.

METHODS

Insured patients with documented allergic respiratory disease of one of the largest statutory health insurances in Germany, 'DAK-Gesundheit', were contacted by postal mail and asked to participate in the study. In case of written consent, primary and secondary data of patients were collected and analysed. Patient characteristics, predictors of being offered AIT, predictors of performing AIT and guideline-compliant care were analysed.

RESULTS

2505 subjects were included in the VerSITA study. Allergy to tree pollen and native speaking were identified as predictors, which increase the probability of being offered AIT. The probability was significantly decreased by the characteristics allergic rhinitis only, allergic asthma only, age in years, non-German citizenship, no graduation and lower secondary qualification. Significant positive predictors for an AIT to be actually performed were: Allergy to tree pollen and male sex. Predictors that decrease the likelihood that AIT is performed were: only allergic asthma, current smoker, former smoker, age and non-German citizenship. Furthermore, it was possible to identify characteristics in which guideline-compliant patients differed significantly from the rest of the study population.

CONCLUSIONS

Based on statutory health insurance data and patient survey data, the VerSITA study provides a broad and in-depth overview of the care situation with regard to AIT in Germany and identifies deficits.

Long-term effects of asthma medication on asthma symptoms: an application of the targeted maximum likelihood estimation

Background

Long-term effectiveness of asthma control medication has been shown in clinical trials but results from observational studies with children and adolescents are lacking. Marginal structural models estimated using targeted maximum likelihood methods are a novel statistiscal approach for such studies as it allows to account for time-varying confounders and time-varying treatment. Therefore, we aimed to calculate the long-term risk of reporting asthma symptoms in relation to control medication use in a real-life setting from childhood to adulthood applying targeted maximum likelihood estimation.

Methods

In the prospective cohort study SOLAR (Study on Occupational Allergy Risks) we followed a German subsample of 121 asthmatic children (9–11 years old) of the ISAAC II cohort (International Study of Asthma and Allergies in Childhood) until the age of 19 to 24. We obtained self-reported questionnaire data on asthma control medication use at baseline (1995–1996) and first follow-up (2002–2003) as well as self-reported asthma symptoms at baseline, first and second follow-up (2007–2009). Three hypothetical treatment scenarios were defined: early sustained intervention, early unsustained intervention and no treatment at all. We performed longitudinal targeted maximum likelihood estimation combined with Super Learner algorithm to estimate the relative risk (RR) to report asthma symptoms at SOLAR I and SOLAR II in relation to the different hypothetical scenarios.

Results

A hypothetical intervention of early sustained treatment was associated with a statistically significant risk increment of asthma symptoms at second follow-up when compared to no treatment at all (RR: 1.51, 95% CI: 1.19–1.83) or early unsustained intervention (RR:1.38, 95% CI: 1.11–1.65).

Conclusions

While we could confirm the tagerted maximum likelihood estimation to be a usable and robust statistical tool, we did not observe a beneficial effect of asthma control medication on asthma symptoms. Because of potential due to the small sample size, lack of data on disease severity and reverse causation our results should, however, be interpreted with caution.

In-vivo diagnostic test allergens in Europe: A call to action and proposal for recovery plan-An EAACI position paper

Diagnostic allergens are defined as medicinal products in the EU. Marketing authorization by national authorities is necessary; however, diagnostic allergens are not homogeneously regulated in different EU member states. Allergen manufacturers argue with increasing costs forcing them to continuously reduce the diagnostic allergen portfolios offered to allergists. In contrast, EAACI and national European Allergy Societies see the need for the availability of a wide range of high-quality diagnostic allergens for in vivo diagnosis of IgE-mediated allergies not only covering predominant but also less frequent allergen sources. In a recent EAACI task force survey, the current practice of allergy diagnosis was shown to rely on skin tests as first option in almost 2/3 of all types of allergic diseases and in 90% regarding respiratory allergies. With the need to ensure the availability of high-quality diagnostic allergens in the EU, an action plan has been set up by EAACI to analyse the current regulatory demands in EU member states and to define possible solutions stated in this document: (a) simplification of authorization for diagnostic allergens; (b) specific regulation of special types of diagnostic allergens; (c) new models beyond the current model of homologous groups; (d) simplification of pharmacovigilance reporting; (e) reduction of regulation fees for diagnostic allergens; (f) reimbursement for diagnostic allergens. Joining forces of allergists, manufacturers and authorities are of high importance to ensure remaining relevant allergens in the EU markets to facilitate a sustainable and comprehensive service for the diagnosis and treatment of allergic diseases.

Impact of increasing treatment rates on cost-effectiveness of subcutaneous immunotherapy (SCIT) in respiratory allergy: a decision analytic modelling approach

BACKGROUND

Specific immunotherapy is the only causal treatment in respiratory allergy. Due to high treatment cost and possible severe side effects subcutaneous immunotherapy (SCIT) is not indicated in all patients. Nevertheless, reported treatment rates seem to be low. This study aims to analyze the effects of increasing treatment rates of SCIT in respiratory allergy in terms of costs and quality-adjusted life years (QALYs).

METHODS

A state-transition Markov model simulates the course of disease of patients with allergic rhinitis, allergic asthma and both diseases over 10 years including a symptom-free state and death. Treatment comprises symptomatic pharmacotherapy alone or combined with SCIT. The model compares two strategies of increased and status quo treatment rates. Transition probabilities are based on routine data. Costs are calculated from the societal perspective applying German unit costs to literature-derived resource consumption. QALYs are determined by translating the mean change in non-preference-based quality of life scores to a change in utility. Key parameters are subjected to deterministic sensitivity analyses.

RESULTS

Increasing treatment rates is a cost-effective strategy with an incremental cost-effectiveness ratio (ICER) of 3484€/QALY compared to the status quo. The most influential parameters are SCIT discontinuation rates, treatment effects on the transition probabilities and cost of SCIT. Across all parameter variations, the best case leads to dominance of increased treatment rates while the worst case ICER is 34,315€/QALY. Excluding indirect cost leads to a twofold increase in the ICER.

CONCLUSIONS

Measures to increase SCIT initiation rates should be implemented and also address improving adherence.