Effect of G28-5 sFv-PE40 administered q1dx2 on Ramos xenografted SCID mice. Mice were injected IV with Ramos cells and were left untreated (♦) or were treated q1dx2 with 0.16 mg/kg G28-5 sFv-PE40 (▿), 0.32 mg/kg G28-5 sFv-PE40 (□), or 0.32 mg/kg BR96 sFv-PE40 (○). Treatment was initiated on day 1 after Ramos implantation.