Correspondence on 'Immune checkpoint inhibitor-induced inflammatory arthritis persists after immunotherapy cessation' by Braaten et al. Issue 1 (6th January 2020) - Ceccarelli, Fulvia; Botticelli, Andrea; Gelibter, Alain Jonathan; Leccese, Ilaria; Lucchetti, Ramona; Cortesi, Enrico; Valesini, Guido; Marchetti, Paolo; Conti, Fabrizio