Clinical Review

Lessons Learned From the RACAT Trial: A Comparison of Rheumatoid Arthritis Therapies

Should biologic therapy be added first in patients with active rheumatoid arthritis or should clinicians first add the less costly but effective combination of conventional therapies?

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Rheumatoid arthritis (RA) is a chronic inflammatory disease of the joints, leading to joint destruction, with significant long-term morbidity and mortality. Over the past quarter century, multiple new therapies and approaches have been introduced, so patients newly diagnosed with RA can realistically expect to be in remission while taking their medications. However, many of the most commonly used medications are costly, making RA care one of the most expensive per patient.1 Early treatment with disease-modifying antirheumatic drugs (DMARDs) and treating all patients to the target of low-disease activity are critical keys to optimal outcomes.

Methotrexate (MTX) is a highly effective and economical first-line DMARD that is recommended as the initial therapy for most patients.2,3 Unfortunately, one-half to two-thirds of patients will not have complete responses and, therefore, require additional therapy. Fortunately, there are more than a dozen therapies that, when added to MTX, have been shown to be better than MTX alone. However, since some of these options use conventional DMARDs and others require biologics, there exist very different economic as well as potential toxicity implications. Understanding how best to treat patients with RA with active disease while on an appropriate dose of MTX is important for both medical and economic reasons.

Despite this being a seminal question for the past 15 years, no blinded trial had addressed this issue before the VA Cooperative Studies Program (CSP) Rheumatoid Arthritis: Comparison of Active Therapies (RACAT) trial. This was true for several reasons, likely including the considerable cost of conducting such a trial and the low priority of this research question for the pharmaceutical industry. Industry-funded trials in RA often focus on new indications, and these studies often fail to address the questions most relevant to the day-to-day care of patients.

For example, it is often not particularly helpful to the clinician that patients placed on “therapy A” are doing better or worse than those placed on “therapy B” after 1 year of the same treatment. Such rigid protocols do not mimic what is done in the clinic: A patient’s treatment program is often changed much earlier than 1 year when it is not working. Therefore, RACAT was designed to more closely mirror clinical practice and to test the strategy of starting conventional therapy before biologic therapy, with the option of changing therapy for nonresponders—similar to what most clinicians would do in practice. This article explores the lessons learned from this landmark trial and highlights the critical role that the VA CSP played.

Trial Background

The RACAT trial, a comparative effectiveness, randomized, double-blind, noninferiority trial, originated as a joint effort of investigators from the VA and the Rheumatology and Arthritis Investigational Network (RAIN) and subsequently involved Canadian enrollment sites. The RACAT results were published in the New England Journal of Medicine in 2013, and its investigative team was awarded the 2014 Lee C. Howley Sr. Prize by the Arthritis Foundation for conducting the most important arthritis research worldwide from the previous year.4

The RACAT originated with a letter of intent to the VA CSP in 2003. The central question to be addressed was whether biologic therapy should be added first in patients with active RA despite MTX or whether clinicians should first add the much less expensive but very effective combination of conventional therapies, including sulfasalazine (SSZ) and hydroxychloroquine to MTX.5,6 This led to the 48-week, binational, multicenter, randomized, double-blind, noninferiority trial comparing the strategy of initially adding hydroxychloroquine and SSZ to MTX (triple therapy group) in patients with active disease despite MTX compared with the strategy of first adding etanercept to MTX.4 Etanercept is among the most commonly used biologic agents approved for RA. Etanercept works by targeting tumor necrosis factor, a pro-inflammatory cytokine central in disease pathogenesis. Both RACAT treatment groups were switched in a blinded fashion to the other therapy at 24 weeks if they did not have a clinically significant improvement. The primary endpoint was a change in the disease activity score (DAS28) from baseline to 48 weeks. An important secondary endpoint was the comparison of radiographic progression of disease at 48 weeks as measured by the validated modified Sharp scoring method. Additionally, and very importantly, economic and functional outcomes were assessed. To conduct the trial, investigators and patients participated from 16 VA sites in addition to 8 Canadian and 12 RAIN sites. The study was sponsored and primarily funded by the VA CSP, VA Office of Research and Development with additional funding coming from the Canadian Institutes of Health Research (CIHR) and from the National Institutes of Health.

Trial Design

To understand the RACAT trial design, one must appreciate the landscape of RA trials conducted in the early-to-mid 2000s. At that time, there had been an explosion of new biologic therapies for RA. Most of the trials were placebo-controlled studies with nonresponders to MTX being placed on placebo vs active drug.7 For ethical and legal reasons, however, clinicians do not treat patients with placebo, especially when highly effective therapies exist, thus limiting the relevance of the classic placebo-controlled trial in RA.8 One of the main tenets of RA therapy in this century has been to use effective therapies to treat patients with active RA with the goal of achieving (and maintaining) either low-disease activity or remission as measured by a composite scoring system, most commonly the DAS28. In order to do this in the framework of a designed research trial, therapies commonly need to be escalated when patients are not doing well, similar to what is done in clinical practice.

The RACAT trial was a comparative effectiveness trial. Comparative effectiveness is not a new idea; in fact, it is precisely how many clinicians practice medicine. It is simply comparing 2 or more treatments to determine which is more effective. Since the inception of the RACAT trial, the American Recovery and Reinvestment Act of 2009 provided $1.1 billion for major expansion of comparative effectiveness research. This changing landscape of federally funded research has highlighted the growing national interest in this type of trial.

This trial design posed several barriers as it applies to the study medications. Methotrexate, hydroxychloroquine, and SSZ are generic medications most often taken orally (MTX is available for parenteral administration). In contrast, etanercept is most often given as a subcutaneous injection and currently is not available in a biosimilar (generic) form in the U.S.; thus, the medication and its delivery device are proprietary. Because this was a double-blind, noninferiority trial, the study required both etanercept-active medication and placebo in identical delivery devices. The makers of etanercept donated placebo etanercept to make blinding possible. The VA, along with CIHR, purchased active etanercept for all trial participants, including those from Canada and the RAIN network. The VA research pharmacy in Albuquerque, New Mexico, was responsible for blinding all active and placebo drugs used in the trial and made these drugs available to all patients, even those not eligible for VA care.In a precedent-setting effort for rheumatology research, RACAT culminated from the collaborations among the private sector, the Canadian health system, and VA. The VA CSP was responsible for the collection of the clinical data, data analyses (Massachusetts Veterans Epidemiology Research and Information Center, VA Boston Healthcare System [VABHS]); the collection of economic data (VA Palo Alto Health Care System); the provision of and payment for the study medications; and the preparation and distribution of active etanercept and placebos (New Mexico VA Health Care System [NMVAHCS]). Through this organizational structure, the trial was successfully completed. In addition to placebo etanercept provided by Amgen (Thousand Oaks, CA), Pharmascience (Montreal, Quebec) provided blinded SSZ and blinded placebo. Neither company was involved in the study design nor did they have an active role in the trial. Hydroxychoroquine and matched placebo were provided by the central pharmacy of the NMVAHCS.

Safety Monitoring

As with any treatment study, patient safety was of paramount importance. Through the aforementioned organizational structure, each participating site had administrative team members who were responsible to the VABHS CSP to ensure research adherence and compliance with best practices. Additionally, an independent data and safety monitoring committee (DSMC) monitored the trial for safety and scientific integrity. At the time that the trial began in 2007, there were questions about the relative efficacy of triple therapy vs MTX plus biologic therapy. Because of this question, the DSMC raised concerns that patients may be placed at a higher risk of joint damage if not placed sooner on biologic therapy. As a response to this concern, the blinded radiographic reviewers were asked to read the hand and feet X-rays as the study progressed, allowing the DSMC to watch for any emerging safety signals. There were none, and in fact, the therapies were essentially identical radiographically.

The consequence of this request was multifold. First, patient safety was maintained; second, the study team was forced to navigate the logistic and technologic challenges posed by the reading and interpretation of the radiographs at an earlier time point than was originally planned; and last, as a result, results became available and were disseminated in a relatively narrow time frame. This third point was very important. One of the major concerns of foregoing biologic therapy was the potential for joint damage. Without the radiographic information, the manuscript could not have been completed in a timely fashion.

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