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Medication adherence and persistence in patients with rheumatoid arthritis, psoriasis, and psoriatic arthritis: a systematic literature review

Authors Murage MJ, Tongbram V, Feldman SR, Malatestinic WN, Larmore CJ, Muram TM, Burge RT, Bay C, Johnson N, Clifford S, Araujo AB

Received 7 March 2018

Accepted for publication 10 July 2018

Published 21 August 2018 Volume 2018:12 Pages 1483—1503

DOI https://doi.org/10.2147/PPA.S167508

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Dr Johnny Chen


Mwangi J Murage,1 Vanita Tongbram,2 Steven R Feldman,3 William N Malatestinic,1 Cynthia J Larmore,1 Talia M Muram,1 Russel T Burge,1,4 Charles Bay,2 Nicole Johnson,2 Sarah Clifford,5 Andre B Araujo1

1Eli Lilly and Company, Indianapolis, IN, USA; 2ICON Plc, New York, NY, USA; 3Wake Forest University School of Medicine, Winston-Salem, NC, USA; 4University of Cincinnati, Division of Pharmaceutical Sciences, Winkle College of Pharmacy, Cincinnati, OH, USA; 5ICON Plc, San Francisco, CA, USA

Purpose: Proper adherence and persistence to medications are crucial for better quality of life and improved outcomes in rheumatoid arthritis (RA), psoriasis (PsO), and psoriatic arthritis (PsA). We systematically describe current adherence and persistence patterns for RA, PsO, and PsA, with a focus on biologics and identifying factors associated with adherence and persistence.
Patients and methods: Using various databases, a systematic literature review of US-based studies published from 2000 to 2015 on medication adherence and persistence to biologics and associated factors was conducted among patients with RA, PsO, and PsA.
Results: Using the medication possession ratio or the percentage of days covered >80%, RA and PsO adherence rates for etanercept, adalimumab, and infliximab ranged from 16% to 73%, 21% to 70%, and 38% to 81%, respectively. Using the criteria of a ≥45-day gap, RA persistence rates for etanercept, adalimumab, and infliximab ranged from 46% to 89%, 42% to 94%, and 41% to 76%, respectively. In PsO, persistence rates for etanercept and adalimumab ranged from 34% to 50% and 50% to 62%, respectively. Similar persistence rates were observed in PsA. Experienced biologics users showed better adherence and persistence. Younger age, female gender, higher out-of-pocket costs, greater disease severity, and more comorbidities were associated with lower adherence and persistence rates. Qualitative surveys revealed that nonpersistence was partly due to perceived ineffectiveness and safety/tolerability concerns.
Conclusion: Biologic adherence and persistence rates in RA, PsO, and PsA in the United States were low, with significant opportunity for improvement. Various factors – including decrease in disease severity; reduction of comorbidities; lower out-of-pocket costs; refilling at specialty pharmacies; and awareness of drug effectiveness, safety, and tolerability – can inform targeted approaches to improve these rates.

Keywords:
biologics, compliance, nonadherence, nonpersistence, factors, discontinuation

Introduction

Rheumatoid arthritis (RA), psoriasis (PsO), and psoriatic arthritis (PsA) are chronic inflammatory diseases that affect patients’ social, emotional, and physical well-being.14 With a diagnosis rate of 41 per 100,000 people worldwide, RA affects approximately 0.5% (1.3 million) of adults in the United States,5 with women approximately 2.5 times more likely to develop RA than men.6 According to the World Psoriasis Day Consortium, 2%–3% of the population (125 million people worldwide) experience PsO7 and 18%–42% of those with PsO also have PsA.7 In the USA, in 2013, an estimated 7.4 million adults had PsO.8

Multiple therapies can treat RA, PsO, and PsA improving in health-related quality of life, relieving symptoms, slowing disease progression for RA and PsA, and providing greater clearance of PsO. However, proper adherence and persistence are crucial to realize these outcomes.

Adherence is the extent to which a patient takes a medication as prescribed by his or her health care professional and is usually reported as medication possession ratio (MPR) or percentage of days covered (PDC).1,9 Medication persistence is generally defined as the duration of time from initiation of therapy to discontinuation and is usually reported as number of days of continuous therapy use.9 Persistence can also be reported as persistence rate, or the percentage of patients continuing with treatment for a defined duration without a predefined gap in treatment.9 Adherence and persistence are problematic in RA, PsO, and PsA.1,2,1012 Nonadherence and nonpersistence lead to suboptimal patient outcomes and place a substantial burden on the health care system.13 Health care costs attributable to nonadherence annually in the United States are estimated to be $100–$300 billion per year.14

A systematic literature review was performed to evaluate medication adherence and persistence reported among patients with RA, PsO, or PsA who are treated with biologics, and identify factors associated with adherence and persistence. There are existing systematic literature reviews of adherence and persistence rates among the individual diseases for multiple treatment types.1,2,4,1519 The current systematic literature review adds to the available literature by evaluating the consistency in the rates of adherence and persistence across patients with RA, PsO, or PsA that has not been previously reported.

Patients and methods

A systematic literature review of medication adherence and persistence to biologics among patients with RA, PsO, or PsA was performed through electronic databases (through December 28, 2015) and e-publications ahead of print (through January 12, 2016) in PubMed and then supplemented with searches of the MEDLINE, Embase, PsycINFO, and Cochrane databases, as well as conference proceedings from the American College of Rheumatology, the American Academy of Dermatology, and the International Society for Pharmacoeconomics and Outcomes Research from 2013 to 2015 (search terms provided in Supplementary materials). Search results were evaluated in a stepwise fashion (Figure 1), with two independent reviewers screening all abstracts and then full-text articles. A third reviewer provided facilitation of reviewer discussion/disagreement. For inclusion, studies must have met the following criteria: 1) been published between 2000 and 2016; 2) utilized an observational study design (ie, prospective cohorts, retrospective cohorts, cross-sectional studies, and case–control studies except where the cases and controls were prespecified to be adherent/persistent and nonadherent/nonpersistent groups); 3) been based in the United States; 4) evaluated adults aged ≥18 years receiving biologic treatment for RA, PsO, or PsA; and 5) provided rates of medication adherence and/or persistence.

Figure 1 PRISMA flowchart of included studies.

Additional information on reasons or factors related to nonadherence or nonpersistence included in these studies was also collated. Data from studies meeting inclusion criteria were extracted into a standardized extraction template in Microsoft Excel by a single reviewer and were validated by a second reviewer. Any studies excluded after review of the full-text article were tabulated with the reason for exclusion. A critical assessment of the included observational studies was conducted based on the questionnaire developed for the effective health program for the Agency for Healthcare Research and Quality.20

Results

Included studies

Forty-three primary studies were included in this systematic literature review (Figure 1). The majority of the studies utilized a retrospective design; a few are cross-sectional studies, and two are prospective studies (Tables 1 and 2). Study participants were assessed from a variety of sources but largely represented populations from claims databases or inpatient/outpatient hospital settings. Most studies reported adherence and/or persistence patterns over 1 year, with some studies using survival methods including Kaplan–Meier plots to report longer term patterns up to 5 years. The sample sizes of the included studies vary widely, ranging from 45 patients35 to 15,834 patients,41 with most including more than 100 patients. Adherence and/or persistence in RA was examined in 26 studies,2132,41 PsO in 12 studies,3440,42,44,5557 and PsA in five studies.32,41,42,58,59 A few studies evaluated a mixed group of patients or data in more than one of the disease states of interest. In addition, some studies examined adherence only, some evaluated persistence only, and others reported both adherence and persistence. In the critical assessment, domains such as study limitations, directness of linkage to the evaluated intervention, consistency, precision, and reporting bias were evaluated. Overall, the studies addressed many of these elements; however, many of the questions related to bias that may stem from differences between groups being compared were not relevant because a majority of the studies were noncomparative in nature. A majority of the studies were considered to be of moderate to high quality for the domains that were applicable (Table 3).


Table 1 Medication adherence study characteristics and results
Notes: aUnless specified otherwise, MPR is based on the sum of days’ supply of the index treatment divided by duration of treatment. The 80% cutoff has been examined as an acceptable threshold in multiple studies assessing medication adherence. Unless specified otherwise, PDC is the percentage of days covered, based on days’ supply of prescription claims during which a patient has medication available during the post-index period. The 80% cutoff has been examined in multiple studies assessing medication adherence and accepted as an accurate threshold. bThe DTM IiTT cohort consisted of all patients enrolled in the DTM ITTprogram who were continuously enrolled in the plan for the 4-month preidentification period and 8-month postidentification period. The DTM completer cohort consists of the subset of DTM ITT patients who completed the month 6 DTM consultation and who could be matched to patients in the community pharmacy and specialty pharmacy cohorts. The community pharmacy and specialty pharmacy cohorts consist of continuously enrolled patients who could be matched to the DTM completer patients.
Abbreviations: ronic medical record; ETN, etanercept; GOL, golimumab; HCQ, hydroxychloroquine; IFX, infliximab; ITT, intent-to-treat; KPSC, Kaiser Permanente Southern California; LF, leflunomide; MAX, Medicaid Analytic Extract; MPR, medication possession ratio; MTX, methotrexate; NR, not reported; PBM, pharmacy benefits management; PDC, percentage of days covered; PsA, psoriatic arthritis; PsO, psoriasis; RA, rheumatoid arthritis; RIiT, rituximab; SSZ, sulfasalazine; TNFi, tumor necrosis factor alpha inhibitor; UCSF, University of California-San Francisco; US, United States; UST, ustekinumab; VvA, Vveterans Affairs.


Table 2 Medication persistence study characteristics and results
Notes: aMedian months of persistence. bPercentage of days of being persistent. cFirst-course therapy was defined as the first exposure to an anti-TNF agent at any time during the study. Second-course therapy was defined as initiation of any anti-TNF agent following the first discontinuation. dData for adalimumab was reported up to 4 years only. eData combined for multiple disease states (rather than separated by disease state).
Abbreviations: ABA, abatacept; ADA, adalimumab; ANA, anakinra; BRASS, Brigham RA Sequential Study; CER, certolizumab pegol; DMARD, disease-modifying antirheumatic drug; DTM, drug therapy management; EMR, electronic medical record; ETN, etanercept; GOL, golimumab; HCQ, hydroxychloroquine; HIRD, HealthCore Integrated Research Database; ICD-9, International Classification of Diseases, Ninth Revision; INF or IFX, infliximab; ITT, intent-to-treat; MAX, Medicaid Analytic Extract; MTX, methotrexate; NR, not reported; PBM, pharmacy benefits management; PsA, psoriatic arthritis; PsO, psoriasis; RA, rheumatoid arthritis; RADIUS, Rheumatoid Arthritis Disease-Modifying Anti-Rheumatic Drug Intervention and Utilization Study; RIT, rituximab; SSZ, sulfasalazine; TNFi, tumor necrosis factor alpha inhibitor; TOC, tocilizumab; US, United States; UST, ustekinumab; VA, Veterans Affairs; VARA, Veterans Affairs Rheumatoid Arthritis; VHA, Veterans Health Administration.

Table 3 Risk of bias assessmenta
Notes: aThe table answers whether there is a low, high, or unclear risk of bias for these questions: 1. Do the inclusion/exclusion criteria vary across the comparison groups of the study? 2. Does the strategy for recruiting participants into the study differ across groups? 3. Is the selection of the comparison group inappropriate, after taking into account feasibility and ethical considerations? 4. Does the study fail to account for important variations in the execution of the study from the proposed protocol? 5. Was the outcome assessor not blinded to the intervention or exposure status of participants? 6. Were valid and reliable measures implemented consistently across all study participants used to assess inclusion/exclusion criteria, intervention/exposure outcomes, participant health benefits and harms, and confounding? 7. Was the length of follow-up different across study groups? 8. In cases of high loss to follow-up (or differential loss to follow-up), was the impact assessed (eg, through sensitivity analysis or other adjustment method)? 9. Are any important primary outcomes missing from the results? 10. Are any important harms or adverse events that may be a consequence of the intervention/exposure missing from the results? 11. Are results believable, taking study limitations into consideration? 12. Were important confounding variables not taken into account in the design and/or analysis (eg, through matching, stratification, interaction terms, multivariate analysis, or other statistical adjustment such as instrumental variables)?
Abbreviation: NA, not applicable.

Rates and factors associated with adherence

A total of 20 studies evaluated adherence rates in RA (14 studies),2134 PsO (six studies),3540 or PsA (one study)32 patient populations, with one study32 evaluating both RA and PsA patients (Table 1). Of these studies, nine analyzed data from private or commercial databases, six from government databases (Medicare/Medicaid/Veterans Affairs), two from registry data, and three from inpatient/outpatient hospital records (Table 1). When reported, follow-up periods were relatively consistent, ranging from 0.5 to 1 year. Individual studies measured adherence in various ways.

Rheumatoid arthritis

In RA, eight studies reported adherence using the standardized threshold of ≥80% for the PDC, the MPR, or the compliance ratio (number of therapy administrations or filled prescriptions divided by the expected number) methods over a 1-year time period.2127,54 Adherence rates varied widely and were generally low. The median adherence rate for etanercept was 63% (range, 16%–73%) and was reported in seven studies.21,2326,28,34 The median adherence rate for adalimumab was also 63% (range, 21%–70%) and was reported in four studies.23,24,26,27 Only three studies reported adherence rates for infliximab using the ≥80% MPR or PDC criteria (38%, 43%, and 81% over 1 year).23,25,28 Although limited, in studies where multiple medications were studied simultaneously, adherence rates were greater for infliximab than for adalimumab or etanercept.23,28 For example, after matching for various baseline covariates, Oladapo et al23 reported a higher adherence rate for infliximab (38%) users compared to adalimumab (21%) and etanercept (16%) users. Likewise, Harley et al28 reported a higher compliance ratio for infliximab users (81%) than for etanercept (68%) and methotrexate (64%) users. Harley et al28 further corroborated the high adherence among infliximab users, reporting that etanercept (odds ratio [OR] 0.462; 95% CI 0.290–0.736) and methotrexate (OR 0.385; 95% CI 0.245–0.604) users were less likely to comply with their medications compared to infliximab users. Also using the criteria of ≥80% MPR or PDC, patients taking golimumab had a higher adherence rate (81%; N=261) than those taking adalimumab (70%; N=1,532) or etanercept (61%; N=2,099).24 Two studies assessed biologic–methotrexate combination therapy, and adherence rates were 26% and 28% over 1 year – higher than adherence to triple therapy combination of methotrexate, hydroxychloroquine, and sulfasalazine (11% and 18%).22,54

Nine RA studies reported significant patient factors associated with better adherence using logistic regression analysis.21,2426,2830,54,60 Patient factors, including older age,21,24,25 male gender,24,29 other races (not including African Americans or Hispanics) compared with Whites,25 and Whites compared with African Americans,21 were identified as more likely to be adherent.

Borah et al26 reported that experienced biologic users were more adherent than new users for both adalimumab and etanercept treatment groups (mean MPR, 70% vs 63% and 73% vs 65%, respectively) and that experienced adalimumab users had 25% higher odds of nonadherence than experienced etanercept users (OR 1.25; 95% CI 1.05–1.49). In another study, higher adherence (monotherapy: mean MPR) was observed for biologic monotherapies (90% infliximab, 83% etanercept, 85% adalimumab) compared to biologic–methotrexate combination therapies (all mean MPRs <75%) or with methotrexate monotherapy (80%).30

Another study found that patients with RA taking biologics who filled prescriptions through specialty pharmacies had higher adherence than those receiving medication from retail pharmacies.31 Over 3 years (2006, 2007, and 2008), the mean adjusted adherence rates for specialty pharmacy and retail pharmacies patients were 63% vs 50%, 68% vs 51%, and 61% vs 44%, respectively.

Psoriasis

Six studies reported adherence rates on PsO (Table 1).3540 Ustekinumab is the most frequently studied. Defining adherence as a PDC ≥80% over 1 year among 2,707 patients with PsO, Doshi et al36 found adherence to be the greatest with infliximab (49%) users, followed by ustekinumab (43%), adalimumab (41%), and etanercept (29%) users. Each of the other studies defined adherence differently (eg, never missing medication or injection, frequency of a missed dose, or adherence to recommended dosing schedule) and had fewer patient samples. Consequently, a wide range of adherence rates was observed (Table 1).

Three PsO studies assessed factors and reasons associated with medication nonadherence.3739 A higher Charlson Comorbidity Index score is associated with decreased biologic adherence.37 In addition, being adherent to other prescribed PsO medications, including topical, phototherapy, or systemic drugs such as methotrexate, prednisone, acitretin, cyclosporine, and isotretinoin, was associated with better adherence to biologics.37 Older age, male gender, concomitant therapy, and low comorbid anxiety were associated with better adherence pattern.38 Based on a web-based survey, common reasons for nonadherence included the need to reschedule existing injection appointments (7.4% adalimumab; 3.2% ustekinumab), the unaffordability of therapies (18.5% adalimumab; 22.6% ustekinumab), forgetfulness (44.4% adalimumab; 3.2% ustekinumab), and other medical problems (not defined; 25.9% adalimumab; 16.1% ustekinumab).39

Psoriatic arthritis

Using the Truven Health MarketScan Commercial Claims database and defining medication adherence as proportion of adherent refills, one retrospective study of 325 patients with PsA reported a 76% adherence rate for golimumab users (Table 1).32

Rates and factors associated with persistence

A total of 23 studies evaluated medication persistence rates in RA (17 studies), PsO (six studies), and PsA (four studies) patient populations, with four studies41,42,44,54 evaluating more than one disease state for their patient population. Persistence was defined variably across studies (Table 2).

Rheumatoid arthritis

In the studies identified, persistence was usually measured as the time that patients continued treatment without a gap, discontinuation, or switching to another therapy over the specified time period. In most studies, the follow-up duration was 1 year and the gaps were ≥30, 45, or 90 days.

Similar to studies of adherence, a wide variation in persistence rates was observed, and the rates were generally low. However, unlike studies examining adherence, no biologic stood out as having higher persistence rates. Using the criteria of a gap of ≥45 days over a 1-year time period, the median persistence rate was 61% (range, 46%–89%) from four studies that evaluated etanercept.4245 For adalimumab and infliximab, the median rates were 57.5% (range, 42%–94%) and 63% (range, 41%–76%), respectively.4245 Abatacept and golimumab rates were reported in three studies,4244 with median rates of 52% (range, 41%–62%) and 29.5% (range, 20%–55%), respectively. Rates were 40% (range, 29%–50%) for rituximab42,44 and 33% for certolizumab.43

Three studies that used the same criteria (≥45-day gap over a 1-year time period) presented the persistence rates by new or experienced biologic users, reporting consistently higher rates for experienced biologic users.42,44,45 However, one study of etanercept, adalimumab, and infliximab users over a 1- and 2-year time period reported that first-time switchers (nonestablished users) and second-time switchers had lower persistence rates, corroborated by higher likelihood of drug discontinuation (OR 1.42; 95% CI 1.22–1.67; P<0.001 and OR 1.35; 95% CI 1.03–1.76; P=0.028, respectively) compared to new biologic users.46 Several studies have compared biologic–methotrexate combinations with various conventional disease-modifying antirheumatic drug (cDMARD) regimens (eg, triple therapy combination of methotrexate, hydroxychloroquine, and sulfasalazine). Generally, persistence in the biologic combination groups was higher than in cDMARD combination patients.22 In comparing various biologic–methotrexate combinations, the mean persistence rate in the overall population over 1 year was 74.6%, with higher rates for infliximab combination (78%) compared to etanercept (72.8%) and adalimumab (70.8%) combination.47 Grijalva et al30 also reported that episodes of adalimumab–methotrexate combinations had a higher likelihood of persistence compared to methotrexate-only episodes (hazard ratio [HR] 0.63; 95% CI 0.48–0.84).

As reported in three studies, patients taking infliximab tended to be more persistent compared to those taking etanercept or adalimumab,45,46,48 and another two studies reported that patients taking etanercept were likely more persistent than those taking adalimumab.26,30 However, there are notable exceptions where adalimumab–methotrexate combinations have greater persistence than infliximab–methotrexate or etanercept–methotrexate combinations,30 with some studies finding no differences in 1- or 5-year persistence rates between tumor necrosis factor (TNF) inhibitors.25,42,44,49,50

Several modifiable and nonmodifiable factors have been associated with persistence either positively or negatively among patients with RA. Nonmodifiable factors identified include age, gender, and race, whereas potentially modifiable factors identified include disease activity, comorbidities, out-of-pocket costs, combination therapy with methotrexate, cumulative use of methotrexate, and therapy management programs (disease therapy management and specialty pharmacy).29,30,46,50,51,61 Older patients tended to be persistent to infliximab (HR 0.99; 95% CI 0.98–1.00; P=0.002); female patients (HR 1.24; 95% CI 1.01–1.51; P=0.040) were more likely to discontinue etanercept; and White patients were more persistent than other races on etanercept.50 Markenson et al50 and Agarwal et al51 reported that patients with higher disease activity (Clinical Disease Activity Index >22: HR 1.35; 95% CI 1.08–1.69; P=0.009; and RA Disease Activity Index scores: HR 1.13; 95% CI 1.05–1.22) and physician global assessment scores (HR 1.27; 95% CI 1.18–1.38) are more likely to discontinue TNF inhibitor use. Higher Charlson Comorbidity Index scores (HR 1.07; P=0.002) and higher weekly out-of-pocket costs (>$50) (HR 1.58; P<0.001) increased the likelihood of nonpersistence to biologic therapy.29 In addition, cumulative use of methotrexate was associated with a decreased risk of TNF inhibitor discontinuation, as combined use of biologic and methotrexate was associated with a decreased risk of discontinuation compared to biologic monotherapy.30,46,51,61

One prospective study evaluated medication persistence to injectable RA medications (etanercept, adalimumab, anakinra, abatacept, infliximab, and rituximab) for patients participating in a disease therapy management program compared to nonparticipants receiving the same medication from specialty or community pharmacies over 0.67 years.33 The persistence rate (>30-day gap or switching) was 77% for disease therapy management intent-to-treat patients, 86.8% for disease therapy management completers, 73% for specialty pharmacy patients, and 52% for community pharmacy patients.33

Other factors reported as reasons for low persistence were lack of effectiveness, continued disease activity, toxicity, and health insurance coverage/cost.52,53

Psoriasis

Six studies reported persistence patterns of biologics over a 1-year time period in PsO.34,42,44,5557 Three of these use a ≥45-day gap period. Median persistence rates for etanercept and adalimumab were 47% (range, 34%–50%) and 57% (range, 50%–62%), respectively.42,44 Similar rates are observed when the definition was based on a ≥60-day gap.55 In a retrospective study of MarketScan data, ustekinumab persistence (71%) was higher than that for adalimumab (53%) or etanercept (19%); however, it should be noted that this study utilizes a gap criteria that depend on the biologic prescribed (a gap definition of ≥30 days to ≥130 days).56 In a separate study, ustekinumab persistence was high (81%), with a gap definition of ≥130 days.57

Clinical variables such as experience with drug and dosing may impact persistence.42,57 One study reported persistence for infliximab users as 55% in new users and 75% in experienced users.42 Patients who initiated on the 90 mg dose of ustekinumab showed lower persistence compared to those who initiated on the 45 mg dose.57 Reasons for stop/switch are similar across biologics, with lack of efficacy being the most frequent reason for nonpersistence.

Psoriatic arthritis

Four studies evaluated persistence rates in patients with PsA.41,42,58,59 Overall, persistence for all biologics, described as no treatment gap or switching over 1 year of treatment, was 61%. Using a ≥45-day gap criterion, persistence rates for etanercept, adalimumab, and infliximab were 51%, 56%, and 74%, respectively, in new users and 58%, 56%, and 79%, respectively, in established users.42 Similar rates for adalimumab and etanercept users were observed in another study using ≥60-day gap criteria to describe persistence.41 Median duration of persistence with monotherapy and biologic–methotrexate combination therapies was 2.4 and 2.4 years, respectively, for adalimumab; 3.9 and 1.6 years, respectively, for etanercept; and 1.4 years for infliximab monotherapy (no data reported for methotrexate–infliximab combination).58

Two studies reported factors associated with biologic persistence in PsA.58,62 Shorter persistence is associated with a history of prior treatment with methotrexate, a history of coronary artery disease, a higher body mass index, and worse scores on most measures of baseline disability and disease activity.58 Ustekinumab was associated with a lower HR of discontinuing treatment (switching or stopping) compared to infliximab, adalimumab, and etanercept.62

Discussion

Since the inception of biologic therapies for the treatment of RA, patients with the disease have experienced an increase in health-related quality of life, relief of symptoms, and decrease in disease progression; however, proper adherence is the key to these positive outcomes because a lack of consistency to any such treatment regimen puts patients at a higher risk for disease reoccurrence and treatment failure.2 Successful treatment with biologics depends on ensuring long-term medication adherence; however, adherence rates differ between types of biologics and treatment schedules.36,53 In turn, this has an impact on the overall treatment effect of the available therapies.

This systematic literature review included a wide range of US studies describing adherence and persistence to biologics for patients with RA, PsO, or PsA. Most studies assessed patients with RA, with fewer studies available on patients with PsO and PsA. Various measures of adherence were used. Most commonly, MPR and PDC were used for reporting adherence, with an 80% cutoff predominantly used as a measure of successful adherence to treatment. Persistence was also defined differently across the studies but was most commonly reported as time from initial start (fill or refill) to treatment gap of ≥30, 45, or 90 days or to discontinuation. Variation in measures of adherence and persistence contributed to a wide range of adherence and persistence rates observed across studies. Etanercept, adalimumab, and infliximab were the most commonly studied biologics in the RA literature, and ustekinumab was the most common in the PsO literature. There was a notable lack of adherence data for patients with PsA.

Overall, adherence and persistence were variable and low across the three disease states. Limited data were available to support a comparison of adherence for the same biologics in RA as compared with PsO, although some suggest a difference in adherence to the same biologics between disease states. The reasons for observed differences are unknown. Adherence and persistence rates of approximately 50%–60% across the disease states were observed for commonly used therapies such as etanercept, adalimumab, and infliximab, although the observed ranges varied widely. Reasons that may contribute to the wide variation in observed adherence and persistence rates include differences in study populations, source of data, drug administration preference, and approaches used to measure adherence and persistence across the studies. Therefore, comparisons of rates between different drugs can be justifiable when drawn from the same study utilizing a comparable patient population and approach. For example, a few studies reported that infliximab users in RA were more adherent compared to adalimumab or etanercept users.23,25,28,30 This might be because of the wider interval schedule and intravenous route of infliximab administration in an outpatient setting compared to self-administered subcutaneous injections for etanercept and adalimumab. In a qualitative survey of patients’ preferences, patients with RA preferred intravenous routes of administration (34.5%) to subcutaneous administration (25.3%), whereas patients with PsA preferred subcutaneous injections (45%) to intravenous infusions (9.7%).60

Many factors were associated with nonadherence or nonpersistence. Although some are demographic or socioeconomic in nature, others were related to patients’ choices or their understanding of treatment pathways. Nonadherence among patients with RA and PsO and nonpersistence among patients with RA were associated with younger age, female gender, non-White race, and refilling prescriptions at retail pharmacies. Interestingly, biologic–methotrexate combination therapy was associated with lower adherence but also with higher persistence among patients with RA when compared to biologic monotherapy. Increased persistence among patients with RA using biologic–methotrexate combination therapy was in agreement with a recent study by Zhang et al,63 which showed that biologic–methotrexate combination therapy users are 30% less likely to be nonpersistent compared to biologic users. Although experience with biologics and the type of therapy affected adherence among patients with RA, they were also notable factors affecting persistence among patients with PsO. High out-of-pocket cost, greater disease activity, and a high number of comorbidities were also deterrents to adherence or persistence. Qualitative surveys revealed that patients were not persistent because of perceived ineffectiveness and safety/tolerability concerns. In a survey, 59% of patients with PsA were not receiving any therapy or were receiving only a topical therapy, with 46% of them believing that the therapies were worse than the disease.3

Strengths of this systematic literature review on adherence and persistence of biologic users in three chronic inflammatory diseases include the variety of data sources used to inform this study, the different patient populations/study designs, and the summarization of observational studies representing real-world experiences. Based on the most current available evidence, consistently low adherence and persistence rates for biologics were observed in all three disease states studied. In addition, the qualitative surveys from patients provided insight into the areas of concerns from the patients’ perspectives. Inherent limitations to this systematic literature review include inconsistency in methodology across published studies and varied dosing schedules of different biologic drugs. These factors limit the ability to pool results for a quantitative summary and complicate standardization and generalizability of the findings. Additionally, because the data summarized here are secondary data based on the available literature, biases inherent in the studies may be present.

Conclusion

Despite the efficacy that biologics have on the outcomes of RA, PsO, and PsA patients, adherence and persistence rates to these medications were low, presenting significant opportunity for improvement. Various factors that may influence medication adherence or persistence patterns – including lower disease severity/activity; fewer comorbidities; lower out-of-pocket costs; refilling at specialty pharmacies; participation in disease management programs; and awareness of drug effectiveness, safety, and tolerability – point to areas where targeted improvements could be focused. These data should serve to guide future research to identify and implement innovative approaches that measure and reduce nonadherence or nonpersistence and improve treatment outcomes in RA, PsO, and PsA patients.

Acknowledgments

We are grateful to Michael Friedman for providing thorough data integrity review of the manuscript. The study was funded by Eli Lilly and Company. Abstract and poster presented at AMCP Nexus 2016 (https://www.jmcp.org/doi/pdf/10.18553/jmcp.2016.22.issue-10-a).

Disclosure

MJM, WNM, CL, TM, RTB, and ABA are employees and stockholders of Eli Lilly and Company. VT, CB, NJ, and SC are employees of ICON plc, which received funding from Eli Lilly and Company to conduct the study. SRF is an employee of the Wake Forest University School of Medicine and has received research, speaking, and consulting support from AbbVie, Celgene, Janssen, Lilly, and Novartis. The authors report no other conflicts of interest in this work.


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e-Pub search in PubMed, January 12, 2016

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