Both perforin-granzyme and FasL pathways contribute to rejection of EG7 tumors upon treatment with anti-CD137 mAbs. Wild type (A), perforin and granzyme A and B knockout (PAB-/-) (B) and FasL-mutant gld (C) mice were injected s.c. with 5 × 105 EG7 tumor cells and treated i.p. with 100 μg of control Rat IgG or anti-CD137 mAb on days 8, 10, 12 and 14 after tumor cell challenge. Mean tumor diameters were sequentially measured 2-3 times per week. 6 mice per group were included. Statistical comparisons were performed using a nonlinear regression statistical method (Y= (MaxVol * exp(X-TimeO))/( 1 + exp((X-TimeO)/RateGrowth)) with GraphPad software. ***, P<0.001 were considered statistically significant.