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Tumor Biology |
Division of Surgical Research [O. K., C. M. B., D. P., M. F., R. D., E. F., S. R. P-S., J. F.] and Department of Neurology [E. N. A.], Childrens Hospital, Boston, Massachusetts 02115; University Hospital Marburg, Department of General Surgery, Philipps University, Marburg, Germany [O. K.]; University Hospital Benjamin Franklin, Department of Gynecology and Obstetrics, Free University Berlin, Berlin, Germany [C. M. B.]; Departments of Ophthalmology [R. D.] and Surgery and Cell Biology [J. F.], Harvard Medical School Boston, Massachusetts 02115; and EntreMed, Inc., Rockville, Maryland 20850 [W. E. F., B. K. L. S.]
In the first Phase I clinical trials of endostatin as an antiangiogenic therapy for cancer, the protein was administered as an i.v. bolus for
2030 min each day. This protocol was based on experimental studies in which animals were treated by s.c. bolus once a day. However, it was not clear in the previous studies whether this schedule could be maximized further. Therefore, we developed experimental models involving continuous administration of endostatin to determine the potency and efficacy of this approach. Endostatin was administered to tumor-bearing mice either s.c. or i.p. in single bolus doses. The efficacy of these regimens was compared with endostatin administered continuously via an i.p. implanted mini-osmotic pump. Our results show that endostatin remains stable and active in mini-osmotic pumps for at least 7 days. We show that endostatin injected i.p. is rapidly cleared within 2 h, whereas endostatin administered continuously via mini-osmotic pump maintains systemic concentrations of 200300 ng/ml for the duration of administration. Furthermore, continuous i.p. administration of endostatin results in more effective tumor suppression at significantly reduced doses (5-fold), compared with bolus administration. Additional experiments using a human pancreatic cancer model in severe combined immunodeficient mice showed that there was a significant decrease in the microvessel density between the treatment groups and the control group. These data show that continuous administration of human endostatin results in sustained systemic concentrations of the protein leading to: (a) increased efficacy manifested as increased tumor regression; and (b) an 810-fold decrease in the dose required to achieve the same antitumor effect as the single daily bolus administration of endostatin. On the basis of this approach, an additional clinical trial has been designed and initiated and is under way in two countries.
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