Provided herein are methods of treating cancer with a combination of an anti glucocorticoid-induced tumor necrosis factor receptor (TNFR)-related protein (GITR)-antibody and an antibody that binds colony stimulating factor 1 receptor (CSF1R) or with a combination of an anti-GITR antibody and an antibody that binds programmed cell death protein 1 (PD-1).