7/72 pts treated with PD-1 inh monotherapy developed de novo inflamm arthritis irAEs confirmed on USS (three PD, four greyscale synovitis). More and more centers reporting >5% inflamm arthritis irAEs - its presence is underestimated! #EULAR2019 THU0035 Sapienza, Rome @RheumNow https://t.co/zWpUtEAEMa