Patient and physician preferences for attributes of biologic medications for severe asthma

Introduction

Severe asthma affects approximately 10% of all asthma patients and is difficult to control with traditional therapies.^1,2 The US, real-world Epidemiology and Natural History of Asthma: Outcomes and Treatment Regimens (TENOR) study of patients with severe or difficult-to-treat asthma demonstrated high rates of health care use by patients with asthma despite use of multiple long-term controller medications.³ Recent identification of different inflammatory asthma endotypes and the availability of targeted treatments, including biologics, have changed the treatment approach for patients with severe asthma.^4–6 However, attributes of available biologic therapies differ, and patient and physician preferences for these attributes remain largely unknown.

While preference research has been conducted among patients with asthma,^7,8 none of these prior studies included biologic therapies. However, preference research on biologic medications has been conducted in other disease areas, including arthritis (eg, rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis),^9–24 psoriasis,^{10,23,25–33} gastrointestinal disorders (eg, Crohn’s disease, ulcerative colitis, irritable bowel syndrome),^10,34–36 neurologic disorders (eg, multiple sclerosis),²⁰ immunodeficiency,^1,2 cancer (eg, breast cancer, non-Hodgkin’s lymphoma),^37–43 osteoporosis,⁴⁴ and general chronic inflammatory conditions.⁴⁵ This prior research included surveys, qualitative studies, and discrete choice experiments (DCEs) and often explored topics such as efficacy, safety/adverse effects, administration characteristics, and cost. From research using DCE methodology, the most commonly included attributes were mode of administration,^{1,2,9,11,16–18,20,27,39} efficacy,^{9,16,17,20,27,30,33,39,46} and dosing frequency.^{1,2,9,16,17,20,27,46}

Results from prior preference studies in other disease areas reported preference for less frequent dosing. In patients with psoriasis, for example, the majority of both biologic-naïve and biologic-experienced patients preferred the administration frequency of once every 12 weeks over once every 1 or 2 weeks.⁴⁷ In addition, of patients with osteoporosis, the majority preferred once-monthly treatment over once-weekly treatment, citing ease of following the treatment regimen and tolerance of adverse effects as key decision factors.⁴⁴ Several preference studies of biologic treatments in other disease areas reported dispreference for intravenous (IV) administration.^9,11,13,17

The dosing frequency of currently available biologic therapies indicated for severe asthma ranges from once every 2 weeks to once every 8 weeks, but little is known about the importance of dosing frequency to patients and physicians in severe asthma care. Understanding patient and physician perceptions and preferences, as well as identifying factors influencing treatment behaviors, may help guide current treatment decisions and the development of new therapies for severe asthma. The purpose of this study was to understand patient and physician perceptions, barriers to care, and preferences for various attributes, including dosing frequency, formulation, mode of administration, time to onset of action, and administration burden for biologic therapies used to treat severe asthma.

Methods

This was a quantitative and qualitative mixed-methods study involving interviews and surveys of adult patients with severe asthma and of board-certified physicians with at least 5 years of experience treating patients with severe, uncontrolled asthma. Sample size was determined based on power analyses used for the primary hypothesis of the co-primary and key secondary endpoints.

Sample

Patients were recruited from six clinical sites in the United States. These sites were identified through an asthma clinical database of sites that were successful in recruiting patients in prior studies and selected based on site interest and feasibility of recruitment. Key participant inclusion criteria included age ≥18 years; diagnosis of severe asthma of ≥3 years; a candidate for biologic therapy and one of the following: currently on biologic therapy for ≥3 months, previously on biologic therapy and had discontinued within last 18 months, or recommended for biologic therapy but declined and were biologic-naïve at the time of study participation. Key exclusion criteria included diagnosed with asthma <5 years ago; currently or had ever previously enrolled in a clinical trial to receive biologic therapy; had a cognitive, physical, or psychological impairment that would interfere with ability to provide consent and participate in interview; or had COPD or lung cancer.

Board-certified pulmonologists and allergists from the United States with experience in prescribing biologics for severe, uncontrolled asthma were recruited through a health care market research firm with access to physician panels. Physicians were recruited through email and screened by telephone or online. Key inclusion criteria for physicians included: Medical Doctors (MD) or Doctor of Osteopathic Medicine (DO) with ≥15 years of overall experience in medicine; currently a board-certified allergist or pulmonologist; ≥5 years of experience treating patients with severe asthma; and currently treating ≥5 patients with biologics for severe asthma per year. Physicians with limited English proficiency were excluded. The physicians were not recruited from the 6 sites that assisted with patient recruitment and were not aware of the identity of the study sponsor.

Identification of attributes

The design for this study was developed based on a two-step approach. The first step involved identification of attributes, as informed by a targeted literature review and social media search. The information was then used to develop the content of the study materials used for the interview and survey-administration portion of the study.

The targeted literature review was conducted via PubMed between August and September 2017 for key peer-reviewed literature published between 2012 and 2017 related to patient and physician perceptions and preferences relevant to biologic treatment (for severe asthma or other therapeutic areas). Overall, 44 articles were identified and the studies described utilized various research methodologies, including surveys, qualitative studies, and DCEs (Figure S1). Only 2 articles were specific to asthma.^7,8 Different attributes were discussed or utilized in experiments, including efficacy, life expectancy, duration of response, safety/adverse effects (eg, minor or serious adverse events), mode of administration, frequency of administration, time of administration, location of administration, number of injections per administration, and cost.^{1,2,9,11,16–18,20,27,30,33,39,46} Results of the search were used to inform the development of the study protocol, interview guide, and any relevant and important medication attributes to be included in the preference survey.

Concurrent with the targeted search of the scientific literature, a social media search was conducted to identify real-world concerns of asthma patients with regards to their treatment perceptions, outcomes, and preferences related to biologic medications (Figure S2).⁴⁸ Posts from November 2003 to September 2017 were extracted and analyzed from healthboards.com (351 posts), drugs.com (44 posts), and WebMD.com (122 posts). All data collection/selection and aggregation activities were carried out through the use of programmed algorithms (R statistical programming). Specific treatment names and other patient identifiable information were removed and replaced with a generic flag prior to data review. Nine main attributes of relevance were discussed in posts (number of posts range: n=212 [efficacy] to n=1 [formulation, or preparation process or procedures for reconstitution of the medication prior to administration]).⁴⁸ Few posts discussed patients’ direct preferences, but posts often included factual information on the attribute topics indicating that it was relevant from the patient perspective. Overall, the most commonly mentioned positive perceptions about asthma biologics discussed in social media were efficacy in reducing asthma symptoms and the reduced need for using other treatments (Figure S3). The biologic treatment attributes most commonly included in negative comments were related to the cost of the biologics (eg, out-of-pocket), access (eg, insurance coverage, distance, wait times), and adverse effects (Figure S4).

Results from both the literature review and social media data mining helped inform the treatment attributes selected for the design of the study. Eight biologic treatment attributes were evaluated and selected based upon their relevance to the decision to initiate biologic treatment in general or the presence of clear differentiation across available treatments (Table 1). Dosing frequency was a primary area of interest given the existing differences across available biologic treatments for severe asthma.

Table 1 Selected attributes and definitions

Measures and procedures

Participants completed both a qualitative telephone interview and a quantitative survey to elicit information about their preferences for, and perceived barriers to, treatment with biologic medications. Physicians completed a web-based quantitative survey immediately before the interview (Survey–Physician). A paper-and-pencil quantitative survey (Survey–Patient) was mailed to patients ahead of the telephone interview but completed at the end of the interview to ensure that the patient understood the medication features of interest. The interviews were designed to elicit information from the participants, and interviewers did not comment or make judgments on participants’ responses with the exception of clarifying any misconceptions.

In the qualitative telephone interviews, patients and physicians were asked detailed questions to help understand the rationale for their preferences and to understand their experiences with biologic treatments, including any barriers they may have encountered. A semi-structured interview guide was used to guide the discussions, which included an introduction to the interview session, and followed up with specific questions and probes that were designed to facilitate discussion and optimize consistency across interviews. Patients and physicians also completed a sociodemographic form. Data regarding general clinical characteristics of the patients were collected from clinical sites, including type and date of asthma diagnosis, physical characteristics such as height and weight, pulmonary function test and FeNO level in the past 12 months, inhaled corticosteroids history, and exacerbation history.

In the quantitative survey, patients and physicians were asked to rate, rank, and select preferred attributes or features of biologic medications indicated for the treatment of severe asthma (Survey-Physician and Survey-Patient). The various exercises were (1) rate 8 features of biologic treatment by importance (1=not at all important; 10=extremely important); (2) rank the same 8 features in order of importance (1=most important feature; 8=least important feature); and (3) select a preference for specific levels of medication attributes which were categorical in nature. For example, patients and physicians were asked about their preferences on dosing frequency (every 2, 4, or 8 weeks). Finally, patients and physicians (4) selected their preferred medication from 4 anonymized profiles of existing biologic medications that were described based on their mode of administration (subcutaneous [SC] vs. intravenous [IV]), dosing frequency (every 2, 4 or 8 weeks), number of injections per treatment, and for physicians only, the process required for administration (Tables S1a and S1b).

The protocol was approved by Ethical and Independent Review Services, a central institutional review board (Ethical and Independent Review Services, protocol #17156-01, v1.0 date 17Nov17, approved 21Nov17) prior to initiation of the study.

All participants provided informed consent prior to participating. Patients provided written informed consent (mailed forms) and verbal consent, while physicians provided electronic (online form) and verbal consent.

Analyses

Quantitative analyses

Descriptive statistics were used to characterize the sample using SAS version 9.4 (SAS Institute, Cary, NC, USA), Mean, SDs, and ranges were presented for continuous variables, and frequencies and percentages were presented for categorical variables.

Chi-squared goodness-of-fit tests were used for analyses of the co-primary endpoints, testing whether patients reported statistically significant preferences for (1) 2-, 4-, or 8-week dosing frequency, and (2) the amount of time between dosing relative to a 1-month interval (<1 month between treatments, 1 month between treatments, or >1 month between treatments). Secondary endpoints included the same goodness-of-fit analyses described above for physician preferences on dosing interval, and tests across the full study sample (ie, patients and physicians combined). Additional post-hoc chi-squared goodness-of-fit tests were also conducted to examine preferences by variables of interest, including: travel distance for treatment, state of residence, years since diagnosis, employment status, current corticosteroid status, biologic status, and location of clinical practice.

Qualitative analyses

All interviews were digitally recorded and transcribed. A qualitative analysis software program, ATLAS.ti version 8.0+,⁴⁹ was used to organize and categorize the text in the interview transcripts. Using a content analysis approach,⁵⁰ the de-identified data were examined for attributes that patients and physicians consider important when evaluating treatment for their severe asthma. A coding dictionary was developed based on the structure of the interview guide. The first two transcripts were independently coded and the coding was compared for consistency. A constant comparative method—an iterative coding approach moving between consecutive transcripts as new codes emerge⁵¹—was used. Participant quotes were then grouped and summarized by thematic code, and coding outputs were generated based on each utilized code.

Results

Sample characteristics

A total of 47 patients and 25 physicians in the US participated in the study. Only 46 patients were included in the final quantitative analysis as one patient had low literacy that prevented accurate collection of quantitative data; however, that patient’s qualitative feedback and sociodemographic and clinical characteristics are reported.

Patients were recruited from a total of 6 clinical sites in different states (Vermont, Kentucky, California, Massachusetts, Virginia, and Arizona) and included approximately 29 patients currently on biologic therapy (4 of whom also had previous experience with a different biologic), 6 patients who were previously but not currently on biologic therapy, and 12 patients who were biologic-naïve. The mean (±SD) age among patients was 49.9±13.1 years, with most being female (74.5%) and non-Hispanic White (74.5%). Eleven patients (23.4%) identified as Black or African‐American. Mean (SD) time since asthma diagnosis was 26.7±14.4 years, and mean patient-reported asthma exacerbations in the last 12 months were 6.5±15.2. Patients also experienced various comorbid health conditions (Table 2). Site-reported clinical information is presented in Table 3. Mean (SD) body mass index was 33.6±8.0 and site-reported patient asthma exacerbations in the last 12 months were 1.2±1.8. Differences in the number of asthma exacerbations between patient and site reports seem to suggest patients may not report all their exacerbation experiences with their doctors, and/or that patients and physicians have different criteria to define an asthma exacerbation. Nine patients had a diagnosis of severe eosinophilic asthma.

Table 2 Patient-reported sociodemographic characteristics (N=47)

Table 3 Site-reported patient clinical characteristics (N=47)

Physicians included 13 board-certified allergists and 12 board-certified pulmonologists from 15 different US states (Table 4). The mean (SD) age of physician participants was 56.6±6.3 years, and the majority were male (80.0%) and from a group practice (64.0%). Physicians reported seeing between 25 and 350 patients with severe asthma each year (mean (SD) 135.8±93.2) and reported treating severe asthma patients as young as 1-year-old (youngest patient on average: 10.2±7.8 years) and as old as 100 (oldest patient on average: 86.7±10.1 years). The mean (SD) number of severe asthma patients currently on biologic therapy was 28.4±21.4 (range: 5–85). Nearly all physicians (92.0%) indicated that the majority of patients they treat have commercial insurance.

Table 4 Physician sociodemographic characteristics

Rating and ranking the importance of each attribute

Among patients, there were 4 medication features that were consistently ranked among the top 3 most important attributes: out-of-pocket costs (65.3% ranked within the top 3, average rating 9.2), mode of administration (IV vs. SC, 52.2% ranked within the top 3, average rating 6.8), administration setting (45.7% within the top 3, average rating 7.7), and time to onset of efficacy (39.1% within the top 3, average rating 7.7) (Figure 1, Figure S5).

Figure 1 Patients’ rankings of importance of biologic medication attributes (N=46). Only n=46 were included in final analysis. One patient was excluded due to low literacy that prevented accurate collection of quantitative data.

Among physicians, the highest-ranked attributes were: mode of administration (IV vs. SC, 72% within the top 3, average rating 7.8), time to onset of efficacy (60% within the top 3, average rating 8.0), dosing frequency (every 2, 4 or 8 weeks; 56% within the top 3, average rating 8.1), and insurance reimbursement/access (48% within the top 3, average rating 8.1) (Figure 2, Figure S6).

Figure 2 Physicians’ rankings of importance of biologic medication attributes (N=25).

Preference between attribute levels

For specific medication features that can be described through categorical levels and that are relevant to both patients and physicians, the survey also included specific questions asking the participants to indicate which level of each feature they would prefer (Figure 3). Both patients and physicians preferred less frequent administration choosing every 8 weeks versus every 4 or 2 weeks (patients P<0.0001, physicians P<0.0001), as well as more than once a month versus once a month or less than once a month (patients P<0.0001, physicians P<0.01). Frequency of treatment preferences was similar when tested across different patient variables, including travel distance for treatment, state of residence, years since diagnosis, employment status, corticosteroid status, or biologic treatment status. Similarly, preferences were similar among physicians practicing in urban vs. suburban locations.

Figure 3 Preferences for biologic characteristics. Only n=46 were included in final analysis. One patient was excluded due to low literacy that prevented accurate collection of quantitative data.

For the mode of administration, there was an overwhelming preference by both patients (100%) and physicians (96%) for SC over IV injection (P<0.0001). There were mixed preferences for who administers the medication (ie, self- or clinician-administered), and where the medication is administered (ie, at home or in a health care setting such as a clinic). Both patients and physicians were split in their preferences regarding who administers the medication; slightly >50% in each group indicated preferences for health care practitioner (HCP) administration in an office or clinic (preferred by 54% of patients, 52% of physicians) versus at home by patient self-administration or caregiver administration (preferred by 46% of patients, 48% of physicians). Of those who endorsed home administration, most physicians preferred patient administration to caregiver administration. Patients, in contrast, were split on who they preferred to have administered the medication at home, with 24% of patients preferring self-administration at home and 22% preferring a family member or other caregiver to administer the treatment at home.

Preference among 4 biologic treatment profiles

In the last exercise of the survey, both patients and physicians were provided with anonymized profiles (A, B, C, and D) reflecting 4 different biologic treatments that aligned with those currently available for the treatment of severe, uncontrolled asthma at the time of the study (Tables S1a and S1b). The order of presentation of the profiles was randomized. The participants were asked to select the profile that they felt was most preferable. The vast majority of both patients and physicians indicated a preference for (Profile A) the product that was injected subcutaneously, has a dosing frequency of every 8 weeks (after the first 3 doses are given every 4 weeks), requires 1 injection each treatment, and the preparation process requires 30 mins wherein the medication is removed from the refrigerator and allowed to reach room temperature prior to administration (Figure 4).

Figure 4 Preferences among 4 biologic treatment profiles. Only n=46 were included in final analysis. One patient was excluded due to low literacy that prevented accurate collection of quantitative data. Treatment profiles presented to patients provided information on how the medication is administered, the frequency of treatment, and the number of injections in each treatment. The profile descriptions were: Biologic A—injected under the skin, every 8 weeks (after first 3 doses given every 4 weeks), 1 injection per treatment; Biologic B—injected under the skin, every 4 weeks, 1 injection per treatment; Biologic C – injected into a vein, every 4 weeks, 1 injection per treatment; and Biologic D – injected under the skin, every 2 or 4 weeks, 1 to 3 injections per treatment. Treatment profiles presented to physicians contained similar information as patients, but also included information on the process required for administration (based on FDA prescribing information). The profile descriptions were: Biologic A—subcutaneous injection, every 8 weeks (after first 3 doses given every 4 weeks), remove from refrigerator & allow to reach room temperature (30 mins) prior to administration. No health care practitioner (HCP_ action required during that time, 1 injection per treatment; Biologic B—subcutaneous injection, every 4 weeks, needs to reconstitute lyophilized powder: Add sterile water to center of powder, gently swirl for 10 s at 15-s intervals until powder dissolves (5–6 mins); ensure solution is clear to opalescent and colorless to pale yellow, 1 injection per treatment; Biologic C—intravenous injection, every 4 weeks, weight-based dosage; insert into infusion bag & invert; administer immediately after preparation, 1 injection per treatment; and Biologic D—subcutaneous injection, every 2 or 4 weeks, determine dose & dosing frequency by serum total IgE level & body weight using dose charts; need to reconstitute lyophilized powder: vial must be upright to inject sterile water & swirl for 5–10 s every 5 mins to dissolve; takes 15–20 min to dissolve; invert vial before administration, 1–3 injections per treatment.

Key qualitative insights on dosing frequency

Qualitative results provided important additional insights into the rationale behind patient and physician preferences for the biologic medication features. Both patients and physicians were consistent in their preferences for less frequent administration. Patients who preferred longer periods between administration reported convenience as a factor behind their preference, citing that less frequent visits meant less trips to the doctor and more money saved. Physicians who preferred 8 weeks (or more than once a month between treatments) reasoned the longer period between administration would be more convenient for patients, resulting in reduced patient burden and improved compliance. Moreover, physicians were aware that patients generally prefer less frequent injections. One physician also indicated that another advantage of fewer visits meant less administrative burden from the clinical site’s perspective.

Although they represented the minority (24–40%, depending on the question), some physicians noted that they had concerns about the longer intervals between treatments (8 weeks or more than once a month) because patients might forget appointments and because they liked the ability to more closely monitor patients on treatment. However, many other physicians indicated shorter periods between treatments meant more time spent by patients on scheduling and physician visits, causing greater interruption and burden to patient quality of life (eg, missed work or daily events), and potentially greater out-of-pocket costs due to more frequent physician visits. Of patients who preferred 4 weeks (or 1 month between treatments), many indicated that 2 advantages of the monthly treatment are that it fits better into their schedule and is easier for them to remember. Some patients also noted this timeframe is what they are used to and most comfortable with.

Key barriers to biologic medications

Patients and physicians mentioned attributes related to convenience, including setting of administration, time required for the medication to be administered, and scheduling treatment as potential barriers to starting or staying on biologic therapy.

Key barriers to biologic medications for biologic-experienced patients included where they receive treatment, administration time, scheduling treatments, and number of injections. Patients preferred administration at a specialist’s office (54%) as opposed to a primary care physician’s office reporting a perception that specialists are more knowledgeable and better equipped to handle situations when compared to primary care physicians. Patients also reported challenges with the inconvenience of traveling to receive treatment and long waiting times at the physician office. Among those who were experienced with biologic therapy, doctor visits varied from 30 mins to several hours. Although most biologic-experienced patients in the study confirmed insurance coverage of most, if not all, of the cost for their biologic therapies, a number did say that co-payments for each doctor’s visit can also be an issue.

001-006: I mean, it’s, it takes an hour to do it. I mean, that’s definitely a challenge, you know? I mean, it’s definitely, you have to schedule it. It’s not like taking a pill at night before you go to bed, you know?

006-013: It is a challenge because you’re giving up, for one thing, going to the physician and actually traveling to them, and then having to sit there for an hour.

006-013: Unfortunately when you are retired and on Medicare and you have only your social security … so cost is a very big part of it that I can’t start that.

What do you not like about biologic therapy? 001-004: That I have to get it every three weeks, that I have to kind of re-up with the insurance and paperwork, and dealing with like the specialty pharmacy.

For biologic-naïve patients, side-effects and mode of administration (i.e., receiving an injection) were key barriers. These patients also mentioned cost, time commitment, scheduling convenience, and speed of onset.

Ultimately, what led your decision not to take biologic therapies? 001-002: My insurance company wouldn’t pay for it and I couldn’t afford the out-of-pocket with the whole price.

002-019: Cost, how it would be, you know, administered, and I guess the frequency in where I would have to go do it. Cost I would say would probably be the biggest as to whether, you know, my insurance would cover any portion of it, and if I could afford to do it.

005-004: If they could find another form of taking it and putting it in a liquid form or a pill form, I would if it’s proven. A needle, if I have to take it every day—I have the great—my body cringes—I just have the greatest fear of the needle. I had a bad episode with a shot and a needle got stuck in my foot, and it just terrified me after that happened.

006-004: I just want to feel it—I want to feel it—relief in like 5 minutes, I just want to know it’s working fast. I like the medicine to work fast most of the time.

006-012: Because I read all the side effects, the possible side effects of it.

Barriers to biologic medications from the physician perspective that were related to initiating treatment included patient testing to assess candidacy for the treatment, convincing patients of the need for the biologic medication, administration setting (eg, clinician office vs. at-home administration), mode of administration, and cost—particularly the administrative burden of obtaining insurance approval.

100-008: Again, the commitment to it, the timeframe in the office. You know, that may be something where you argue, yeah, home would it be better … Typically the biggest barrier is, A, to recognize your illness to be severe enough to need biologics and, B, you know, logistically, again barring the one that’s at home, just the ones that need office visits and time spent.

100-014: If I prescribe an inhaler or a pill, the patient goes to the pharmacy and they pick it up and that’s the end of it. With these biologics, it’s drama after drama after drama and phone call after phone call, and denial and this, and they don’t send the drug. They send the wrong drug. They send it to the wrong location. It’s endless aggravation.

100-017: Yeah, it takes time and then the nurses, the three nurses are already competent in doing that. It’s just the time issue. Sometimes, especially when we are trying to get a prior authorization for a new start …

100-026: From the start, it’s a very complicated process to get it approved. There are obviously different insurances; each of them has their requirements. Some of them have their own forms. It is all very complicated … So it’s still burden on the staff.

Barriers to biologic medications from the physician perspective that related to staying on treatment included speed of onset and effectiveness, convenience of administration, out-of-pocket costs and insurance, and compliance. Similar to patients, physicians (84%) most commonly preferred that patients see specialists. Physicians reported a wide range of variability in the percentage of patients who are affected by these barriers. Some physicians only mentioned a small subset of patients, up to 5%, while others reported that 20% of their patients had some barriers to staying on treatment. In regard to product formulation, several physicians mentioned disadvantages of reconstitution, a step required by 2 of the product profiles, noting the requirement for patients to be onsite before the clinic can begin reconstitution, increased visit time, increased cost and resources, and the increased risk for errors and contamination due to the preparation step.

100-025: I would say the main barrier is a lack of efficacy and a timeframe that the patient would—I would say there’s two barriers. Efficacy is a barrier in two different ways. One is how long it takes to work and two it doesn’t work at all anyway …

100-001: They feel better, so they don’t want it. They don’t understand it’s the drug that’s making them feel better, so the misconception that they are all cured and don’t need it, that’s one—and that also goes to the doctor not having a good endpoint like a serologic marker.

100-003: To be willing to undergo the injections and to be patient enough to wait for them to work, and I think in there is the convenience factor. You know, if you’ve got to get injected three times a week, that’s going to be a much less compliant patient potentially than somebody that can take a shot every two months.

100-022: … the needle phobia, the fear of a new product, though that tends to wane. But just the commitment, the cost, the schedule, and then above it all if they find the doctor six, twelve months that it’s not helping significantly, well they’re going to be less inclined to continue with it.

Discussion

This study found that both patients and physicians have strong and consistent preferences for SC administration, less frequent dosing, and faster onset of efficacy with biologic therapy for severe asthma. Both patients and physicians indicated that less frequent administration meant less interference and impact on daily activities, fewer appointments, lower out-of-pocket costs, and reduced administrative burden to HCPs. These findings are consistent with the literature, as current research on biologic therapies in other disease areas also support patient preferences favoring the least frequent dosing interval.^44,47

Regardless of whether or not patients had experience with biologic therapy, SC administration was preferred over IV administration. IV administration was considered more intrusive and less convenient in terms of both time and cost. Physicians also reasoned that SC was less resource-intensive, was less invasive, was not dependent on the condition and availability of veins, was more preferred by patients, had fewer adverse events or better tolerability, was easier to monitor, avoided the use of IV cannulas or infusion pumps, and was more convenient overall.

Cost and insurance reimbursement are significant barriers for both patients and physicians. These barriers were overcome by those who were on therapy but tended to consistently reemerge over time. Examples include issues concerning insurance changes, insurance re-authorizations, affordability, acceptable locations for administration, and availability of assistance programs. Nevertheless, for many physicians, the largest concern related to insurance reimbursement and access was not obtaining the drug for a patient, but rather obtaining the drug in a timely manner that would avoid a gap in treatment. While many physicians indicated that patient out-of-pocket cost does not factor into their decision to place a patient on biologic therapy, physicians did acknowledge that patient out-of-pocket cost can be a challenge to a patient’s decision to start or stay on a biologic therapy. Although most biologic-experienced patients in the study confirmed insurance coverage of most, if not all, of the cost for their biologic therapies, a number did say that co-payments for each doctor’s visit can be an issue. For several patients, rising costs were one of the biggest reasons for stopping a particular treatment. Changes in insurance coverage, lapses in insurance coverage, and approval requirements were all reported as contributing to the rising out-of-pocket costs for patients. Costs were also a significant barrier for the naïve patients, several of whom indicated that this was the primary reason that they did not initiate biological therapy.

Attributes related to convenience, including setting of administration, time required for the medication to be administered, and scheduling treatment were also discussed as potential barriers to starting or staying on biologic therapy. Both groups preferred administration at a specialist’s office (54% patients, 84% physicians) as opposed to a primary care physician, reporting a perception that specialists are more trained and knowledgeable with respect to these medicines, have more support personnel, and are better equipped to handle adverse reactions and emergencies. Some patients noted less trust in their primary care physician’s ability to treat them, lack of organization at their regular doctor’s office, as well as better service and comfort with their specialist as other reasons for their preference. Despite this preference, the most commonly reported challenge for staying on therapy was the inconvenience of traveling to receive treatment and long waiting times at the physician office. Among patients naïve to biologic therapy, scheduling convenience and time commitment were also among the most common factors that prevented them from initiating therapy.

A small number of patients in the study made incorrect assumptions about the attributes of some attributes. In particular, 3 patients believed treatment administered by IV worked faster compared to other forms of administration. Additionally, when patients were asked to select a preference between every 2, 4, or 8 weeks, 6 (including both biologic-naïve and biologic experienced) patients had a misconception that more time between treatments meant they were likely to be less effective. Finally, 2 patients from the naïve group also believed longer periods between treatments automatically meant larger doses/injection volumes. These misconceptions were clarified by the interviewers, but the fact that they were identified in this interview-based study raises an important consideration for all researchers who design and engage in preference elicitation studies. These incorrect patient assumptions also highlight the importance and need for patient education and discussions with physicians regarding the specific characteristics of available treatment options.

Limitations

The results of this study should be interpreted in consideration of the following limitations. First, this study used ranking and rating approaches to assess preferences, rather than a conjoint analysis/DCE. This was partly due to the mixed-methods nature of the study and the small target sample size. Therefore, the results provide less information on the relative importance of each attribute when considered as a set. The strength of the design included the ability to better understand the specific rationale for the preferences that were elicited based on the qualitative interviews. In addition, the study did not include some important attributes that could potentially influence patient and physician choice, including product-specific efficacy and safety based on specific patient characteristics; these attributes were excluded as they are already established as important and because they cannot be generalized across all patients since they will vary based on each patient’s individual clinical profile. Due to the study’s focus on preference ratings for individual attributes rather than a DCE, the exclusion of these attributes did not bias the study. Because this was a smaller qualitative study with specific recruitment targets, there was not sufficient power to look at differences in the ratings and rankings by patient characteristics. For example, for biologic treatment status, there were insufficient data among those who had previously been on biologic therapy and those who were naïve to biologic therapies to make any meaningful comparisons between these groups. In addition, there was some overlap between the current and previous groups, where some members of the current group had also been on a previous biologic. Recruitment methods may have resulted in some selection biases. For example, patients who agreed to participate may have had a greater likelihood of seeking treatment. Similarly, physicians recruited through the research panel may not represent the average physician. Efforts were made to recruit a diverse, representative, and unbiased sample.

Conclusions

This study provided important insights into the preferences of both patients and physicians for the features of biological medications indicated for the treatment of severe asthma. Patients and physicians expressed strong preferences for SC administration, less frequent dosing, and faster onset of efficacy. A slight majority preferred administration in the specialist office, and financial access and convenience were key barriers to use. Increased awareness and understanding of these preferences and barriers may be useful in facilitating conversations between physicians and their patients as they consider available biologic treatment options.