<p>Mice (5/group) transplanted i.p. with 3 × 10<sup>6</sup> ID8 cells 10 days previously were injected i.p. twice at 4 days interval with the indicated mAb combinations (0.5 mg of each mAb/mouse); survival was recorded (A, C) and mean survival time was calculated (B, D). The experiment was repeated once with similar results. E, Mice (8-9/group) transplanted i.p. with 3 × 10<sup>6</sup> ID8 cells 3 days previously were injected i.p. twice at 4 days interval with 0.5 mg of control, anti-PD-1, anti-CD137 and anti-PD-1/CD137 mAb and their survival was recorded. *P < 0.05, **P < 0.01, compared with control mAb treated mice. </p
