CEBPD and neoplasm: Primary tumor growth, as determined by weight of the tumor at sacrifice four weeks after cancer cell injection, was slightly but not significantly reduced in C/EBPδ-/- mice as compared to wildtype mice (Figure 2a,b) (weight of 1.15 ± 0.25 vs. 0.79 ± 0.15 g (p = 0.36) for wildtype and C/EBPδ-/- mice, respectively).