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Updates on ACR Gout Guideline, FDA’s Febuxostat Warning & Pegloticase Therapy

Jason Liebowitz, MD, FACR  |  November 19, 2021

Dr. Pillinger

ACR CONVERGENCE 2021—Gout has been recognized for centuries, yet exciting advances in its management continue to be made every year. Michael Pillinger, MD, a professor of medicine and a professor of biochemistry and molecular pharmacology in the Rheumatology Division at NYU Langone Health, New York City, presented an update on gout and its management as part of the meeting’s annual Review Course.

Some rheumatologists may be surprised to learn that anti-interleukin-1 (IL-1) therapy is a potential option under the 2020 ACR Guideline for the Management of Gout.1 In a study by Saag et al., 165 patients with gout were randomized to receive anakinra, in a subcutaneous dose of 100 mg or 200 mg daily for five days, or triamcinolone, intramuscularly in a dose of 40 mg once, for any gout flare over the course of two years. Although anakinra did not show superiority over triamcinolone for the primary end point of change in patient-assessed pain intensity in the most affected joint, the two medications had comparable efficacy in pain reduction. Further, anakinra was favored for most secondary end points without demonstrating any unexpected safety findings.2

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The 2020 ACR guideline also provides valuable practical tips for clinicians, such as a conditional recommendation to start urate-lowering therapy if a patient has had one lifetime gout flare and has either chronic kidney disease of stage 3 or greater or a serum uric acid level greater than 9 mg/dL. Note: The voting panel, for the first time, conditionally recommended against treating asymptomatic hyperuricemia.

Regarding when to start urate-lowering therapy, a conditional recommendation in the guideline is to start it as soon as possible, and contrary to conventional wisdom in some clinical circles, starting urate-lowering therapy during an acute gout flare—if appropriate anti-inflammatory therapy is being given—is not contraindicated. Clinicians are additionally advised to continue prophylactic therapy with colchicine or another agent for three to six months when starting urate-lowering therapy; to switch hydrochlorothiazide for an alternative anti-hypertensive (preferably losartan), whenever possible; and to continue urate-lowering therapy indefinitely once it has been started.1

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Febuxostat Risk

A considerable portion of Dr. Pillinger’s talk covered the U.S. Food & Drug Administration’s (FDA) Boxed Warning regarding the risk of cardiovascular death associated with febuxostat. This warning was largely based on data from the CARES trial, in which patients with gout who were older than 50 and had cardiovascular disease were randomized to receive either febuxostat or allopurinol. In this study, patients treated with febuxostat were found to have higher all-cause mortality (hazard ratio 1.22, with a 95% confidence interval [CI] of 1.01 to 1.47) and cardiovascular mortality (hazard ratio 1.34, with a 95% CI of 1.03 to 1.73) than those treated with allopurinol.3

In his discussion of the study, Dr. Pillinger noted that some potential confounders of the results include a high dropout rate (i.e., about 50% in each intervention arm) and the findings that most adverse events were captured among dropouts—that is after they were off medication—and that 85% of deaths occurred in patients when they were not receiving study drugs. Moreover, in subgroup analysis, no difference in mortality between the febuxostat and allopurinol arms was found when looking at patients on aspirin and patients who were not taking non-steroidal anti-inflammatory drugs.

With a more recent study from The Lancet showing non-inferiority in non-fatal myocardial infarction, acute coronary syndrome, non-fatal stroke and cardiovascular death in patients treated with febuxostat vs. allopurinol, the question of how to regard cardiovascular risk with febuxostat remains unanswered.4

Comparisons between febuxostat and allopurinol are relevant because it remains unclear which urate-lowering therapy is more effective for most patients. In addition, using allopurinol as part of a treat-to-target strategy may be a slow process to achieve goal serum uric acid levels, especially in patients with chronic kidney disease in whom titration of allopurinol must be performed even more slowly and cautiously than usual.

Allopurinol can be associated with several rare, but severe, adverse events, including allopurinol hypersensitivity syndrome, with possible Stevens-Johnson syndrome, bone marrow and renal failure, and death. Positivity for the HLA-B*5801 allele confers a 150–500-fold increased risk of allopurinol hypersensitivity syndrome, and given the increased presence of this allele in patients of certain ethnicities (including Han Chinese, Thai and African American), testing for the allele is conditionally recommended in these patients prior to starting allopurinol.1

Dr. Pillinger ended his lecture by discussing pegloticase, a recombinant porcine-like uricase that providers can use for patients who have failed urate-lowering therapy or have severe disease, particularly chronic tophaceous gout. This medication is becoming more widely used in select patients, and several studies have looked at combining pegloticase with immunosuppressants, such as azathioprine, methotrexate and mycophenolate mofetil, to improve tolerance and prevent formation of anti-drug antibodies that often require terminating therapy.

In Sum

The presentation by Dr. Pillinger was comprehensive and helpful, and the audience walked away with a better appreciation of the clinical pearls that apply to this age-old disease.


Jason Liebowitz, MD, completed his fellowship in rheumatology at Johns Hopkins University in Baltimore, Md., where he also earned his medical degree. He is currently in practice with Skylands Medical Group in New Jersey.

References

  1. FitzGerald JD, Dalbeth N, Mikuls T, et al. 2020 American College of Rheumatology Guideline for the Management of Gout. Arthritis Rheumatol. 2020 Jun;72(6):879–895.
  2. Saag KG, Puja KP, Keenan RT, et al. A randomized, phase II study evaluating the efficacy and safety of anakinra in the treatment of gout flares. Arthritis Rheumatol. 2021 Aug;73(8):1533–1542.
  3. White WB, Saag KG, Becker MA, et al. Cardiovascular safety of febuxostat or allopurinol in patients with gout. N Engl J Med. 2018 Mar 29;378(13):1200–1210.
  4. Mackenzie IS, Ford I, Nuki G, et al. Long-term cardiovascular safety of febuxostat compared with allopurinol in patients with gout (FAST): A multicentre, prospective, randomised, open-label, non-inferiority trial. Lancet. 2020 Nov 28;396(10264):1745–1757.

 

 

 

 

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Filed under:ACR ConvergenceClinical Criteria/GuidelinesConditionsGout and Crystalline ArthritisMeeting Reports Tagged with:ACR Convergence – GoutACR Convergence 2021ACR Convergence 2021 – GoutFebuxostatGoutpegloticase

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