Survival of SCID mice bearing xenotransplantated Hodgkin’s tumors. The survival of the groups treated with the diabody (•) or biMoAb HRS-3/A9 (▴) was significantly prolonged (P< .0001, logrank test) compared to the following control groups: PBS alone (x); PBL in PBS (□); mixture of parental MoAb HRS-3 and A9 with PBL (◊); diabody without PBL (○). Animals were removed from the experiment when the tumor size exceeded 1 cm in diameter (approximatly 0.4 to 0.6 cm³).