Fig. 3.
Immunotherapy of A31- or BCL1-bearing mice with BsAb directed against huCD64 on the effector cells and Id on the tumors.
Groups of 5 huCD64+ age-matched mice received 2 μg/d murine G-CSF subcutaneously, 4 days before tumor inoculation, and throughout the course of therapy (10 days in total). Mice were inoculated with either 105 (BCL1) or 2 × 105 (A31) tumor cells intraperitoneally on day 0 and were treated with twice-daily doses of 5 μg BsAb intraperitoneally on days 1 to 5 (50 μg/mouse in total). (This treatment schedule is shown in the inset.) Treatment was as indicated: PBS (●), anti-huCD64 F(ab')2 (⋄), anti-Id F(ab')2 (■), a mixture of anti-Id and anti-huCD64 F(ab')2 (♦), [huCD64 × Id] (○). Symbol labeling on plots shows antibody specificity. Anti-Id Ab preparations were selected for reaction with A31 or BCL1 Id Ig, as appropriate. Survival was recorded daily. Only cohorts treated with [huCD64 × Id] BsAb showed a significant increase in survival over all control groups (P < .02).