VSIR and acute myeloid leukemia: To test the effect of anti–mPD-1H mAbs (13F3) in the absence of host cell–derived PD-1H, C1498FF–PD-1H AML cells were s.c. or i.v transplanted into B6 PD-1H–KO mice, and mice were treated with13F3 or control mAbs.