This provides pharmaceutical compositions that comprise a combination of an anti-cancer agent which is an first antibody and a second antibody. In some embodiments, the first antibody is an anti-Programmed Death-1 (PD-1) antibody. In certain embodiments, the composition is a fixed dose formulation. In certain embodiments, the composition is administered as a flat-dose. The disclosure also provides a kit for treating a subject afflicted with a disease, the kit comprising a dosage of any composition disclosed herein and instructions for using the composition in any of the disclosed methods for treating a disease.本發明提供包含作為第一抗體之抗癌劑與第二抗體之組合的醫藥組合物。在一些實施例中,第一抗體為抗程式化死亡-1(PD-1)抗體。在某些實施例中,組合物為固定劑量調配物。在某些實施例中,組合物以均一劑量投與。本發明亦提供一種用於治療罹患疾病之個體的套組,該套組包含一定劑量之本文揭示之任何組合物及在任一所揭示之方法中使用該組合物治療疾病之說明書。