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Features of polymyalgia rheumatica–like syndrome after immune checkpoint inhibitor therapy
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  1. Gregoire Martin de Fremont1,
  2. Rakiba Belkhir1,
  3. Julien Henry1,
  4. Anne Laure Voisin2,
  5. Olivier Lambotte3,4,
  6. Florent L Besson5,6,
  7. Xavier Mariette1,4,
  8. Gaetane Nocturne1,4
  1. 1Rheumatology, AP-HP, Université Paris Saclay, Hôpital Bicêtre, Le Kremlin-Bicêtre, France
  2. 2Unité Fonctionnelle de Pharmacovigilance, Gustave Roussy, F-94800, Villejuif, France
  3. 3Médecine Interne et Immunologie clinique, AP-HP.Université Paris Saclay, Hôpital Bicêtre, Le Kremlin-Bicêtre, France
  4. 4Université Paris-Saclay, INSERM, CEA, Centre de recherche en Immunologie des infections virales et des maladies auto-immunes, Le Kremlin-Bicêtre, France
  5. 5Biophysics and Nuclear Medicine, AP-HP.Université Paris Saclay, Hôpital Bicêtre, Le Kremlin-Bicêtre, France
  6. 6UMR BioMaps, Inserm/CNRS/CEA/Université Paris-Saclay, Orsay, France
  1. Correspondence to Dr Gregoire Martin de Fremont, Rheumatology, AP-HP, 94275 Le Kremlin Bicetre, France; gregoire.martin-de-fremont{at}aphp.fr

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We read with great interest the article published by Braaten and colleagues1 describing inflammatory arthritis (IA) induced by immune checkpoint inhibitors (ICIs) persisting after immunotherapy cessation. With a growing number of patients treated with ICI, more and more immune-related adverse events are described and a classification has been recently proposed for IA under ICI.2 It questions whether IA under ICI shows distinctive features from well-defined rheumatological conditions. Here, we report a series of 14 patients who developed polymyalgia rheumatica (PMR)–like syndromes under ICI and compared them with a series of 43 patients with classical PMR seen in the same tertiary centre.

We included patients with rhizomelic pain under ICI from our tertiary department of rheumatology (AP-HP, Université Paris-Saclay) and the pharmacovigilance registry of the Gustave Roussy Cancer Institute. The diagnosis of PMR was based on trained clinicians’ assessment. Among 14 patients, 11 fulfilled the EULAR/ACR 2012 criteria for PMR. The comparison between PMR-like syndromes and classical PMR showed a difference in sex ratio and a higher frequency of peripheral arthritis in the ICI group (57% vs 28%) (table 1). C reactive protein (CRP) was positive (>5 mg/L) in most cases in both groups: 92.3% and 88.1% in ICI group and classical PMR, respectively. Among the five patients of the ICI group who underwent 18F-FDG PET/CT imaging before rheumatological treatment, three showed rhizomelic peri-articular 18F-FDG PET uptakes associated to a volar FDG uptake at the hands.3 Thirteen patients received glucocorticoids with eight good responders. Among the five other patients, one received methotrexate, three received tocilizumab (one who responded, one who had primary failure and one who had drug-induced hepatitis) and one healed after ICI disruption.

Table 1

Characteristics of ICI+PMR compared with ICI−PMR

To sum up, the main finding of this study is the higher prevalence of peripheral arthritis in PMR-like syndromes induced by ICI. The frequency of increased CRP was the same. Lastly, the therapeutic strategies remain the same as what is proposed in classical PMR, but further studies are mandatory to define the optimal treatment strategy and notably the room for biologic disease-modifying antirheumatic drugs.

Acknowledgments

The authors thank the Unité Fonctionnelle de Pharmacovigilance from Gustave Roussy

Cancer Institute.

References

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Footnotes

  • Twitter @RakibaBelkhir

  • Contributors GMdF collected data for clinical situations, performed literature searches and drafted the manuscript. All other coauthors edited the manuscript.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.

  • Patient consent for publication Not required.

  • Provenance and peer review Not commissioned; internally peer reviewed.

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