title: Arthritis and tenosynovitis associated with the anti-PD1 antibody pembrolizumab in metastatic melanoma.
abstract: We report the acute onset of polyarticular inflammatory arthritis in 2 patients receiving the immune check-point inhibitor, pembrolizumab (MK-3475), anti-PD1 drug for metastatic melanoma after 14 and 11 months therapy, respectively. The first patient had severe tenosynovitis, synovitis, bone marrow edema, and myositis, whereas the second patient had predominantly synovitis and tenosynovitis. Good symptomatic control was obtained with bisphosphonates and salazopyrin, avoiding the use of T-cell immunosuppressants. These cases raise important questions on whether anti-PD1 therapy allows preexisting autoimmune T-cell clones to escape tolerance by suppressing regulatory T cells or whether they allow autoimmunity to develop de novo. These conditions heighten our awareness of complications associated with the clinical use of these agents, and provide a prototypical model for future research into the understanding of autoimmunity.
authors.affiliation: *The Crown Princess Mary Cancer Centre ∥Rheumatology Department, Westmead Hospital †Melanoma Institute Australia ‡Sydney Medical School, The University of Sydney §Westmead Institute for Cancer Research, Westmead Millennium Institute, Sydney, NSW, Australia.
authors.forename: Matthew M K
authors.initials: MM
authors.lastname: Chan
authors.forename: Richard F
authors.initials: RF
authors.lastname: Kefford
authors.forename: Matteo
authors.initials: M
authors.lastname: Carlino
authors.forename: Arthur
authors.initials: A
authors.lastname: Clements
authors.forename: Nicholas
authors.initials: N
authors.lastname: Manolios
mesh_terms: D000368:Aged; D061067:Antibodies, Monoclonal, Humanized / Q000009:adverse effects*; D000970:Antineoplastic Agents / Q000009:adverse effects*; D001168:Arthritis / Q000139:chemically induced*; D005260:Female; D006801:Humans; D008297:Male; D008545:Melanoma / Q000188:drug therapy*; D008875:Middle Aged; D013717:Tenosynovitis / Q000139:chemically induced*
chemical_list: D061067:Antibodies, Monoclonal, Humanized; D000970:Antineoplastic Agents; C582435:pembrolizumab