Abstract
Denileukin diftitox (Ontak) was evaluated in combination with methotrexate (MTX) for preventing acute graft-versus-host disease (GVHD) in dogs given 9.2 Gy of total body irradiation and DLA-nonidentical hematopoietic cell grafts. Six dogs were given denileukin diftitox 9 μg/kg/day intravenously (IV) on days 2, 4, 5, 7, 8, and 10, in combination with MTX 0.4 mg/kg/day IV on days 1, 3, 6, and 11 after transplantation. Median survival of the dogs given MTX in combination with denileukin diftitox was 16 days (range, 13-18 days), similar to that of 35 historical controls given MTX alone (median survival, 20 days). Five of the 6 denileukin diftitox–treated dogs had clinical and pathological evidence of 3-system GVHD; 1 dog died of canine herpes virus infection without evidence of GVHD. In conclusion, denileukin diftitox did not prevent, mitigate, or delay acute GVHD in this stringent and predictive (with respect to outcomes in human patients) hematopoietic cell transplantation model.
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