RT Journal Article SR Electronic T1 Pre-existing antiacetylcholine receptor autoantibodies and B cell lymphopaenia are associated with the development of myositis in patients with thymoma treated with avelumab, an immune checkpoint inhibitor targeting programmed death-ligand 1 JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 150 OP 152 DO 10.1136/annrheumdis-2018-213777 VO 78 IS 1 A1 Andrew L Mammen A1 Arun Rajan A1 Katherine Pak A1 Tanya Lehky A1 Livia Casciola-Rosen A1 Renee N Donahue A1 Lauren M Lepone A1 Anastasia Zekeridou A1 Sean J Pittock A1 Raffit Hassan A1 Jeffrey Schlom A1 James L Gulley YR 2019 UL http://ard.bmj.com/content/78/1/150.abstract AB