Abstract
Introduction
As research continues, new drugs will no doubt be added to the current pool of treatments for moderate-to-severe atopic dermatitis (AD). This raises the need for studies to determine prescriber preferences for different pharmacological options and the factors that influence their choice of treatment. Here we aim to explore physician preferences in the systemic treatment of moderate-to-severe AD, identify the sociodemographic characteristics that can influence physician preferences, and evaluate their satisfaction with current AD therapies.
Methods
A discrete-choice experiment (DCE) survey was administered to physicians treating patients with AD in Spain. Results were analyzed using a conditional logit model to estimate the relative importance of each attribute and the maximum risk accepted to achieve therapeutic benefit.
Results
A total of 28 respondents completed the DCE survey (67.9% female, mean age 45.9 years). Participants identified objective clinical efficacy and risk of severe adverse events (AEs) as the most important attributes, followed by improvement in sleep and pruritus and faster onset of action from the start of the treatment. Respondents gave less importance to mode of administration and therapeutic benefit in other atopic conditions. Respondents were willing to accept an increased risk of severe AEs and mild-to-moderate AEs leading to treatment discontinuation due to intolerance in order to obtain improvements in efficacy, sleep, and pruritus, and long-term clinical benefit.
Conclusion
Our findings can help prescribers choose the most appropriate systemic AD therapy.
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Avoid common mistakes on your manuscript.
Why carry out this study? |
The pool of treatments for moderate-to-severe atopic dermatitis (AD) is increasing |
Physician preferences and factors influencing them need to be explored |
Discrete-choice experiments allow one to identify physician preferences in patient treatment |
What was learned from the study? |
Treatment efficacy and safety, and symptom relief, were the most important features, while the route and frequency of administration were considered less relevant |
These observations can guide therapeutic choices in AD both now and in the future and will also help other decision-makers involved in the treatment of this highly disabling disease |
Introduction
Atopic dermatitis (AD) is a chronic, relapsing inflammatory disease that is characterized by eczematous lesions [1]. Onset usually occurs in childhood, even though it can present at any age, and has a prevalence of 10–20% [2, 3]. Adult AD has a prevalence of 5–10% [4, 5]. AD diagnosis is based on clinical criteria that include the presence of pruritus and dermatitis [6]. It is also associated with multiple comorbidities that compromise functionality and productivity and affect the patient’s health-related quality of life (HRQoL) [1, 6,7,8,9,10]. Moreover, AD negatively impacts mental and psychological health, HRQoL, sleep, work productivity, and activity in adults [11]. Children with AD experience a significant burden with deep impact on HRQoL as well as bullying at school and concerning the domains of daily activities, school, leisure, and personal relationships [12].
According to a study carried out in three areas of Spain, the prevalence of severe AD in adults was 0.08% (95% CI, 0.07–0.09%) [13], representing approximately 10% of patients with AD [14]. As disease symptoms in moderate-to-severe AD are usually not properly controlled with only topical treatment, systemic drugs are usually prescribed [14].
Cyclosporin A and oral corticosteroids are currently the only conventional systemic immunomodulators approved for the treatment of adults with moderate-to-severe AD [15]. Other immunosuppressants, such as methotrexate, azathioprine, and mycophenolate, are used off-label [14].
Biological treatments have recently become available for the treatment of patients with AD. Of these, dupilumab was the first to be licensed for use in moderate-to-severe forms of the disease in children, adolescents, and adults, and marked a paradigm shift in AD management. The use of this human monoclonal antibody (mAb) directed against the IL-4 α-chain receptor gives rapid and sustained improvement in the signs and symptoms of moderate-to-severe AD and in the patient’s HRQoL [16, 17]. Since its introduction, evidence of its long-term safety at all ages has been collected [18, 19], even during the COVID-19 pandemic [12]. Recently, the anti-IL-13 mAb tralokinumab has shown a positive benefit/risk profile and has also been approved for use in adults with AD in Europe [20]. Moreover, several phase 2/3 trials evaluating the efficacy and safety profile of other therapeutic alternatives, such as the mAbs lebrikizumab and nemolizumab, are currently ongoing [21, 22].
Following these advances in the treatment of AD, Janus kinase inhibitors (JAKi) have also been suggested as promising treatments for this disease [23,24,25]. Among them, upadacitinib and baricitinib, which were originally conceived and marketed for the treatment of rheumatic conditions and were already used off-label in AD, have recently been approved by the European Medicines Agency for their use in AD [26, 27]. Upadacitinib can be used for patients aged 12 years and older, while baricitinib is approved only in adults. Abrocitinib, another JAKi that has shown efficacy and a good safety profile in patients with AD [28, 29], has recently been approved by the UK’s Medicines and Healthcare products Regulatory Agency (MHRA) and Japan’s Ministry of Health, Labour and Welfare (MHLW) for use in adolescents and adults with moderate-to-severe AD. JAKis offer a different mechanism and onset of action, efficacy, safety profile, and response over time compared with previous treatments, and are thus a valid therapeutic alternative to biologics [30, 31].
As research continues, new drugs will no doubt be added to the current pool of treatments for moderate-to-severe AD [32]. All this raises the need for studies to determine prescriber preferences for different pharmacological options and the factors that influence their choice of treatment.
We performed a discrete-choice experiment (DCE) to elicit and analyze physician preferences with respect to moderate-to-severe AD treatment. The main aim of this study was to explore physician preferences for systemic treatment of moderate-to-severe AD. Secondary objectives were to identify the sociodemographic characteristics that influence physician preferences and to determine their degree of satisfaction with current AD therapies and with others that will become available soon.
Methods
Statement of Ethics Compliance
In Spain, studies not involving patients are not required to be reviewed by a research ethics committee. Therefore, a research ethics committee approval was not applicable in this study.
Study Development
The study workflow is shown in Fig. 1.
DCE Design
Choice of treatment attributes and levels. We conducted a review of articles published in PubMed over the last 10 years to identify the specific treatment attributes and attribute levels of AD systemic therapies. A focus group consisting of dermatologists and allergists (n = 6) was formed and asked to rank a list of attributes extracted from the literature on the basis of their importance in the clinical decision-making process. The group was also asked to suggest other attributes to be included in the DCE that had not been identified in the literature review, and to list the attribute levels according to their relevance in their experience in clinical practice in Spain.
Scenario design and participant selection. Once the attributes and their levels in systemic AD treatments had been defined, the systemic treatment scenarios to be included in the DCE were constructed and selected using a balanced orthogonal design (each attribute level is an independent variant, and each level appears the same number of times). We used fractional factorial analysis to minimize as far as possible the different scenario combinations in order to avoid fatigue when completing the survey and the resulting risk of bias in the answers [33]. The final survey included 12 different scenarios and nine attributes, and participants were asked to choose between two treatment alternatives or neither. The final list of attributes and their levels is presented in Table 1, and Fig. 2 shows an example of a choice task from the DCE. All applicable good practices for the design of DCEs [33,34,35] were followed.
Ad hoc questionnaire. Participant sociodemographic variables, including sex, age, years of experience with AD, hospital seniority, and region where they work, were collected in an online questionnaire. Physician satisfaction with current drugs used in the systemic treatment of moderate-to-severe AD was also assessed using a series of 5-point Likert-scale questions graded from “strongly disagree” to “strongly agree.”
Participants and sample size. A minimum sample size of 28 participants was estimated on the basis of the recommendations of Orme with regard to DCE methodology for attributes with two levels [36]. A total of 58 dermatologists and allergists with wide experience in treating AD were invited to participate.
Survey. The survey was administered online; participants received an email invitation containing the link to the survey portal, where they were then asked to register by entering their email and setting a new password. The survey was available between May and June 2021.
Statistical Analyses
An initial descriptive analysis of participant characteristics was performed using the statistic software IBM SPSS Statistics v25.
A conditional logit (clogit) model was used to analyze the DCE, following the good practices in Conjoint Analysis recommended by the International Society for Pharmacoeconomics and Outcomes Research [34]. Clogit is a mathematical regression model in which the physician’s choice is the dependent variable (V) and the levels of each attribute are the independent variables (β1–βi):
The utility, that is, the eligibility of a particular alternative was estimated by considering the sum of the attribute importance score of each of the attributes included in the DCE.
The relative importance of each attribute was estimated as the ratio between the range of importance scores of each attribute (maximum to minimum) and the sum of the utility ranges of all attributes.
We performed multiple regression analysis to identify the extent to which physician characteristics influence their preference for each attribute. In this model, the dependent variable was the importance score of each attribute, and the independent variables were the sociodemographic characteristics. The independent variables considered were, in no particular order: (1) age, (2) sex, (3) Autonomous Community in Spain, (4) hospital seniority, (5) years of experience as a specialist, (6) patients with AD treated per month, and (7) degree of satisfaction with available systemic AD treatments.
As a secondary objective of the study, the maximum acceptable risk (MAR) was calculated to show the extent to which physicians were willing to trade a determined risk or a less desirable characteristic for a clinical benefit.
Results
Focus Group Results
According to the physicians, the most important attributes when prescribing a systemic AD treatment and therefore the ones finally selected were, in no particular order: (1) objective clinical efficacy, (2) onset of action, (3) improvement of sleep and pruritus, (4) long-term efficacy, (5) risk of severe adverse events (AEs), (6) risk of mild-to-moderate undesirable AEs leading to treatment discontinuation due to intolerance, (7) mode of administration, (8) therapeutic benefit in other atopic manifestations, and (9) possible dose modification to individualize therapies.
Respondent Characteristics
A total of 58 dermatologists and allergists were invited to take part in the survey, of whom 35 accepted the invitation and 28, corresponding to the minimum estimated sample size, finally completed the DCE survey. Most were women (67.9%), and the mean age (SD) was 45.9 (8.9) years. Their sociodemographic characteristics are summarized in Table 2.
Preference Weighting
Results from the clogit model are summarized in Table 3 and plotted in Fig. 3. Physicians participating in the DCE preferred, on average, an objective clinical efficacy of 100%, a ≥ 7 improvement in sleep and pruritus on the visual analog scale (VAS), and long-term efficacy lasting > 1 year (p < 0.001, p < 0.001, and p = 0.039, respectively). Respondents showed their preference for a < 1% risk rate for severe AEs and for < 10% mild-to-moderate undesirable AEs leading to treatment discontinuation due to intolerance (p < 0.001 in both cases). Respondents were indifferent with regard to the remaining attributes, such as onset of action from the start of treatment, mode of administration, the therapeutic benefit in other atopic manifestations, and the possibility of individualizing treatment, as no statistically significant differences were observed between the levels of these attributes in the DCE.
Objective clinical efficacy was the most important attribute, given the range of attribute levels included in the DCE design, and showed the greatest difference (sixfold) between the lowest (50%) and the highest (100%) utility. The second most important attribute was the risk of severe AEs [nearly fourfold difference in utility from the highest (≥ 1%) to the lowest (< 1%) risk]. These were followed by improvement in sleep and pruritus, onset of action from the start of the treatment, and the risk of mild-to-moderate AEs.
Maximum Acceptable Increase in Risk
Clogit analyses were also used to determine the MAR of AEs in return for an improvement in any of the efficacy-related attributes [37]. Resulting MAR values are presented in Table 4. Respondents were willing to trade a noticeably high MAR (nearly 150%) of mild-to-severe AEs for a 50–100% increase in objective clinical efficacy. Respondents were also willing to accept increases of nearly 70% in the risk of AEs for an improvement of < 7 to ≥ 7 on the VAS in sleep and pruritus, and an increase of nearly 40% in the risk of AEs to achieve a long-term efficacy of > 1 year.
In contrast, respondents were not willing to trade an increase in the risk of AEs for improvements in any of the other attributes included in the DCE survey.
Subgroup Analyses
We analyzed whether the respondents’ sociodemographic characteristics influenced their preferences for a particular attribute (Supplementary Material, Table S1). According to our analysis, women are more likely to prefer 100% efficacy than men (p = 0.031), in other words, women attach more importance to objective treatment efficacy than men. Women also showed a stronger preference for minimizing the risk of mild-to-severe AEs than men (p = 0.015). None of the other factors included in the analysis showed a significant impact on clinician preferences.
Respondents’ Degree of Satisfaction with Available Systemic AD Treatments
Respondents were also asked to rate their degree of satisfaction with the available systemic AD treatments in terms of the attributes included in the DCE survey. The majority were satisfied with current systemic AD therapies in terms of their clinical efficacy (75.00%, n = 21), onset of action (67.86%, n = 19), improvement in sleep and pruritus (67.86%, n = 19), risk of severe AEs (60.72%, n = 17), and mode of administration (67.86%, n = 19). The degree of satisfaction with the other aspects included in the analysis was around 40%. Thus, 57.14% (n = 16) of respondents were generally satisfied with current treatments.
The results of these questionnaires were also used to perform an analysis to determine the extent to which the respondents’ degree of satisfaction influences their preferences. Only three of the comparisons between respondent preferences and degree of satisfaction were statistically significant. Respondents who were fairly dissatisfied with the risk of mild-to-moderate or severe AEs associated with current systemic AD therapies showed preference for a ≥ 7 improvement in sleep and pruritus (p = 0.041 and p = 0.005 for mild-to-moderate and severe AEs, respectively). Also, as expected, respondents who were dissatisfied with the long-term efficacy of current systemic AD therapies preferred a long-term efficacy of > 1 year (p = 0.005).
Discussion
In the context of a new era in the treatment of AD following the approval of several new active principles and the wide range of AD drugs already available, we analyzed prescriber preferences for the different attributes of systemic treatments for moderate-to-severe AD in Spain. Our results show that the main attributes that experts in Spain take into consideration when choosing an AD drug are, in this order, objective efficacy, the risk of severe AEs, improvement in sleep and pruritus, onset of action from start of the treatment, and the risk of mild-to-moderate AEs. MAR analysis showed that experts were willing to trade an increased risk of severe and mild-to-moderate AEs for increased benefit in terms of objective efficacy and improvement in sleep and pruritus.
This is in line with the results of a similar study performed in Japan, in which physicians were more likely to value the efficacy of biological therapies in the treatment of AD [38]. In terms of AEs, another study in the USA comparing physician and patient preferences reported that the former are more concerned with the possibility of long-term AEs than the latter [39].
As in the aforementioned studies [38, 39], two recently published DCEs performed in patients with moderate-to-severe AD [40] and in adults, adolescents, and caregivers of children with mild-to-severe AD [41] showed that respondents gave similar importance to efficacy and safety of systemic AD treatments. In Boeri et al. [40], adult patients valued the probability of skin clearance at 16 weeks as the most important efficacy attribute, while patients participating in the recent study by Ervin et al. [41] valued the speed and duration of symptom relief as the most important attribute included in the DCE. Systemic short-term and long-term AD drug-related AEs, particularly malignancy, serious infection, and venous thromboembolism [40], were of equal importance for respondents in both studies [40, 41]. Prescriber and patient opinions differed in the case of other attributes. As previously seen in other preference studies, clinicians in our study rated the mode of administration as not very important, while patients with AD tend to give it considerable importance [38, 39, 41] and prefer oral drugs over injectables [40].
The differences in physician preferences were not significantly influenced by any of the respondents’ sociodemographic characteristics except for sex, with women showing a slightly greater preference for high efficacy and less risk of mild-to-moderate AEs compared with men. However, men represented less than 30% of the sample, and these differences in opinions may be influenced by sample composition. Further research is needed to confirm this trend.
The results of our study can also be used to infer physician preference for a particular drug over another when treating moderate-to-severe AD. Compounds such as mAb and JAKis that reduce AD symptoms and improve the likelihood of skin clearance [27, 42] might be preferred by physicians prescribing systemic AD treatments, since our respondents rated improvement of dermatitis as the most important attribute. Similarly, dupilumab, which does not increase the risk of long-term AEs, might also be preferred over other systemic immunosuppressants, such as methotrexate or azathioprine, which increase the risk of malignancy [43]. Safety issues with JAKis have also been reported [44], although this aspect in the context of AD remains unclear.
Most respondents were generally satisfied with current systemic AD treatments, although the overall satisfaction rate was less than 60%. Satisfaction was lower for some attributes, including long-term maintenance of clinical efficacy, risk of mild-to-moderate AEs, possibility of dose adjustment, and benefit in other atopic conditions. This suggests that opinions differ considerably among physicians, and the drugs currently available do not meet all their needs. This, however, did not greatly influence the treatment preferences of our respondents. Our correlation analysis shows that low satisfaction with mild-to-moderate AE risk correlated with a preference for greater improvement in sleep and pruritus, and low satisfaction with the duration of efficacy of current treatments correlated with a greater preference for long-term clinical efficacy.
Although the utility of DCEs in determining patient and physician preferences has been demonstrated [33,34,35], this study has limitations inherent to its specific design. The definition of attributes and levels, a critical step in this method, inevitably depends on the group of experts that prioritized them from evidence available in the literature. However, we were careful to include both dermatologists and allergists in the focus group in order to collect both points of view and minimize bias. However, as the sample of this study was not stratified by specialty, we are not able to compare preferences according to this factor. Our decision to limit the number of levels to two per attribute for the sake of simplifying the choice task might also have oversimplified the complexity of AD treatment. The scenarios included in the DCE survey are hypothetical; thus, the combinations of attributes that are rated in the DCE may not exist in clinical practice. However, the purpose of the study is to determine which characteristics are most highly valued by clinicians, and this may help in decision-making.
Conclusion
Even considering the study limitations, this is one of the first studies to describe physician preferences in the context of systemic treatment in patients with moderate-to-severe AD, and the only study of its kind in Spain. The definition of the attributes that prescribers consider the most important and the risks they are willing to assume in order to obtain a clinical benefit will, we believe, guide therapeutic choices in AD both now and in the future, and will also help other decision-makers involved in the treatment of this highly disabling disease.
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Acknowledgements
The authors thank the patient for participating in this project.
Funding
Sponsorship for this study was funded by Pfizer Spain SLU, Alcobendas, Spain. The journal’s Rapid Service Fee was also funded by the sponsor.
Medical Writing, Editorial, and Other Assistance
Medical writing support under the guidance of the authors was provided by Javier Arranz-Nicolás, PhD, from Medical Statistics Consulting (MSC), Valencia, Spain, and was funded by Pfizer Spain, Alcobendas, Spain, in accordance with Good Publication Practice (GPP3) guidelines (Battisti, WP et al. Ann Intern Med. 2015).
Authorship
All named authors meet the International Committee of Medical Journal Editors (ICMJE) criteria for authorship for this article, take the responsibility for the integrity of the work as a whole, and have given their approval for this version to be published.
Author Contributions
Conceptualization: José Manuel Carrascosa Carrillo, Maria Giovanna Ferrario, and Francisco José Rebollo Laserna; Methodology/Software/Validation/Visualization: Maria Giovanna Ferrario; Project administration: Francisco José Rebollo Laserna; Formal analysis and investigation/Writing-original draft/Writing-review and editing: José Manuel Carrascosa Carrillo, Eulalia Baselga Torres, Yolanda Gilaberte Calzada, Yanina Nancy Jurgens Martínez, Gastón Roustan Gullón, Juan Ignancio Yanguas Bayona, Susana Gómez Castro, Maria Giovanna Ferrario, and Francisco José Rebollo Laserna; Funding acquisition: Susana Gómez Castro, Francisco José Rebollo Laserna; Resources: Francisco José Rebollo Laserna; Supervision: José Manuel Carrascosa Carrillo, Francisco José Rebollo Laserna.
Disclosures
José Manuel Carrascosa Carrillo has been an advisory board member and/or participated in clinical trials and/or received speaker’s fees from Pfizer, Sanofi, Galderma, Lilly, Abbvie, and LEO Pharma; Eulalia Baselga Torres has been an advisory board member and/or participated in clinical trials and/or received speaker’s fees from Sanofi, Pierre Fabre, Abbvie, Pfizer, LEO Pharma, Viatris, and Ferrer; Yolanda Gilaberte Calzada has been an advisory board member and/or participated in clinical trials and/or received speaker’s fees from Pfizer, La Roche-Posay, Lilly, Abbvie, Almirall, and ISDIN; Yanina Nancy Jurgens Martínez declares no conflicting interests; Gastón Roustan Gullón has been an advisory board member, participated in clinical trials and received speaker’s fees from Pfizer, Sanofi, Abbvie, and Janssen; Juan Ignacio Yanguas Bayona has collaborated with Pfizer, Abbvie, Lilly, Novartis, Almirall, and LEO Pharma; Susana Gómez Castro was an employee and shareholder of Pfizer Spain SLU at the time of this analysis; Maria Giovanna Ferrario is an employee of Medical Statistics Consulting, the consulting company which has given support to all phases of this study including study design and performance, focus group leadership, online questionnaire design and implementation, and medical writing; and Francisco José Rebollo Laserna is an employee of Pfizer Spain SLU.
Compliance with Ethics Guidelines
In Spain, opinion studies not involving patients are not required to be reviewed by a research ethics committee. Therefore, a research ethics committee approval was not applicable in this study.
Data Availability
All data generated or analyzed during this study are included in this published article/as ementary information files.
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Carrascosa Carrillo, J.M., Baselga Torres, E., Gilaberte Calzada, Y. et al. Quantifying Physician Preferences for Systemic Atopic Dermatitis Treatments Using a Discrete-Choice Experiment. Dermatol Ther (Heidelb) 12, 1197–1210 (2022). https://doi.org/10.1007/s13555-022-00723-z
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DOI: https://doi.org/10.1007/s13555-022-00723-z