1298P - EULAR recommendations for the diagnosis and the management of rheumatic immune-related adverse events due to cancer immunotherapy

Rheumatic immune-related adverse events (irAEs) are increasingly recognized musculoskeletal manifestations in cancer patients receiving immune checkpoint targeted immunotherapy. Since they represent a spectrum of new clinical entities and a robust evidence base is lacking, a task force was convened to harmonize expert consensus regarding their identification and management due to the lack of dedicated clinical trials. Our aim was to develop EULAR recommendations for the diagnosis and the management of rheumatic irAEs due to cancer immunotherapy, based on literature and expert opinion. Recommendations were developed according to the 2014 EULAR Standard Operating Procedures. The task force consisted of 19 clinical experts from Europe and North America (14 rheumatologists, 2 internists and 3 oncologists), 1 clinical epidemiologist, 1 allied health professional and 2 patient representatives. During the first meeting, the group defined the focus of the task force, the target population, and formulated research questions. A systematic literature research was performed by one fellow (MK) with the help of a librarian. Based on available evidence and using a consensus procedure, recommendations were developed during a second meeting. The level of agreement was determined by an anonymous voting process. 4 overarching principles and 10 recommendations were developed. The overarching principles define the role of rheumatologists and highlight the shared decision-making process between patients, oncologists and rheumatologists. One recommendation addresses the referral process, two address the diagnosis, and five address the therapeutic strategy of cancer patients experiencing rheumatic, musculoskeletal, and systemic signs or symptoms while receiving immunotherapy. An additional recommendation was included to address pre-existing rheumatic conditions and the last focuses on the diagnostic approach before immunotherapy. These recommendations provide the basis of a EULAR consensus on the diagnosis and the management of rheumatic irAEs, worthwhile for rheumatologists, internists and oncologists. EULAR, European League Against Rheumatism. EULAR, European League Against Rheumatism. All authors have declared no conflicts of interest.