The invention provides novel anti-FCMR antibodies, pharmaceutical compositions comprising such antibodies, and therapeutic methods of using such antibodies and pharmaceutical compositions for the treatment of diseases such as cancer or autoimmune disease.L'invention concerne de nouveaux anticorps anti-FCMR, des compositions pharmaceutiques comprenant de tels anticorps, et des méthodes thérapeutiques d'utilisation de tels anticorps et compositions pharmaceutiques pour le traitement de maladies telles que le cancer ou une maladie auto-immune.