Chen ST, Semenov YR, Alloo A, Bach DQ, Betof Warner A, Bougrine A, Burton L, Cappelli LC, Castells M, Cohen J, Dewan AK, Fadden R, Guggina L, Hegde A, Huang V, Johnson DB, Kaffenberger B, Kroshinsky D, Kwatra S, Kwong B, Lacouture ME, Larocca C, Leventhal J, Markova A, McDunn J, Mooradian MJ, Naidoo J, Choi J, Nambudiri V, Nelson CA, Patel AB, Pimkina J, Rine J, Rubin KM, Sauder M, Shaigany S, Shariff A, Sullivan RJ, Zubiri L, Reynolds KL, and LeBoeuf NR
With an increasing number of patients eligible for immune checkpoint inhibitors, the incidence of immune-related adverse events (irAEs) is on the rise. Dermatologic immune-related adverse events (D-irAEs) are the most common and earliest to manifest, often with important downstream consequences for the patient. Current guidelines lack clarity in terms of diagnostic criteria for D-irAEs. The goal of this project is to better define D-irAE for the purposes of identification, diagnosis, and future study of this important group of diseases.The objectives of this project were to develop consensus guidance for an approach to D-irAEs including disease definitions and severity grading. Knowing that consensus among oncologists, dermatologists, and irAE subspecialists would be critical for usability, we formed a Dermatologic irAE Disease Definition Panel. The panel was composed of 34 experts, including oncologists, dermatologists, a rheumatologist, and an allergist/immunologist from 22 institutions across the USA and internationally. A modified Delphi consensus process was used, with two rounds of anonymous ratings by panelists and two virtual meetings to discuss areas of controversy. Panelists rated content for usability, appropriateness, and accuracy on 9-point scales in electronic surveys and provided free text comments. A working group aggregated survey responses and incorporated them into revised definitions. Consensus was based on numeric ratings using the RAND/UCLA Appropriateness Method with prespecified definitions.Following revisions based on panelist feedback, all items received consensus in the second round of ratings. Consensus definitions were achieved for 10 core D-irAE diagnoses: ICI-vitiligo, ICI-lichen planus, ICI-psoriasis, ICI-exanthem, ICI-bullous pemphigoid, ICI-Grover's, ICI-eczematous, ICI-eruptive atypical squamous proliferation, ICI-pruritus without rash, and ICI-erosive mucocutaneous. A standard evaluation for D-irAE was also found to reach consensus, with disease-specific exceptions detailed when necessary. Each disorder's description includes further details on disease subtypes, symptoms, supportive exam findings, and three levels of diagnostic certainty (definite, probable, and possible).These consensus-driven disease definitions standardize D-irAE classification in a useable framework for multiple disciplines and will be the foundation for future work. Given consensus on their accuracy and usability from a representative panel group, we anticipate that they can be used broadly across clinical and research settings., Competing Interests: Competing interests: MS: Consulting with Amgen, AbbVie, Arcutis, Bausch Health, Boehringer Ingelheim, Bristol-Myers-Squibb, Eli Lilly Canada, Fresenius Kabi Canada, Galderma, Incyte, Janssen, L’Oreal Canada, LEO Pharmaceuticals, Merck, Novartis, Pierre Fabre, Pfizer, Sanofi, Sun Pharmaceuticals, UCB Canada.LCC: Research funding- Bristol-Myers Squibb, Consulting- AmgenAM: Research Funding: Amryt Pharma, Incyte Corporation, Kintara Therapeutics, Novartis, Novocure Consulting: ADC Therapeutics, Alira Health, AstraZeneca, Blueprint Medicines, Protagonist Therapeutics, OnQuality, and Janssen Royalties: UpToDateCAN: CAN has received research grants from Boehringer Ingelheim and participated in an advisory board for work related to pustular psoriasis and palmoplantar pustulosis.VH: Royalties from UpToDateML: Research funding: Onquality, Novartis, AZ, Lutris, Novocure; Consulting: Onquality, Novartis, AZ, Lutris, Novocure, La Roche Posay, JanssenMC: PI for Blueprint, Cogent, Author for UpToDateNRL: Consultant for or has received honoraria from Seattle Genetics, Sanofi, Bayer, Seattle Genetics, Sanofi, Silverback and Synox Therapeutics outside the submitted work., (© Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)