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Human Myeloid and Lymphoid Malignancies in the Non-Obese Diabetic/Severe Combined Immunodeficiency Mouse Model: Frequency of Apoptotic Cells in Solid Tumors and Efficiency and Speed of Engraftment Correlate with Vascular Endothelial Growth Factor Production

Divisions of Hematology-Oncology [L. F., C. R., F. P., G. M., F. B.], Experimental Oncology [A. G.], and Pathology [G. P.], IRCCS European Institute of Oncology, 20141 Milan, Italy, and Second Division of Pathology, IRCCS Maggiore Hospital, 20100 Milan, Italy [N. C.]

Recent studies have suggested that non-obese diabetic/severe combined immunodeficiency (NOD/SCID) mice transplanted with human hematological malignancies show higher levels of engraftment compared with other strains. We used this model to compare xenotransplantability of human leukemia and lymphoma cell lines and to investigate angiogenesis in hematopoietic malignancies. Ten of 12 evaluated cell lines were able to engraft NOD/SCID mice within 120 days. A strong correlation was observed between the amount of vascular endothelial growth factor (VEGF) produced in vitro by cultured cells and the efficiency of tumor engraftment (r = 0.808; P = 0.001), and an inverse correlation was found between VEGF production and the time of tumor engraftment (r = -0.792; P = 0.006) and between VEGF production and the frequency of apoptotic/dead cells in solid tumors (r = -0.892; P = 0.007). Moreover, VEGF production correlated with the frequency of endothelial (CD31+/CD34+) cells in solid tumors (r = 0.897; P = 0.001). Taken together with in vitro data presented here and indicating that the VEGF antagonist Flt-1/Fc chimera inhibits leukemia and lymphoma cell proliferation, our findings support a role for tumor-derived VEGF in leukemia and lymphoma progression. Furthermore, the present study confirms previous observations indicating that VEGF expression may play a crucial role in xenotransplantability of human solid malignancies in SCID mice. The NOD/SCID model is promising for future evaluations of antiangiogenic drugs, alone or in combination with established chemo- or immunotherapy regimens.

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