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• W2044235770 abstract "Isolated limb perfusion (ILP) with tumor necrosis factor-alpha (TNF) and melphalan for advanced extremity malignancies achieves significant complete response rates. To study molecular mechanisms underlying this response, a nude rat ILP model with a human melanoma xenograft was developed.NIH1286 human melanoma was grown subcutaneously in the hind limb of nude rats. Anesthetized rats underwent a 10-minute ILP via femoral vessels with hetastarch, heparin, and melphalan, TNF, or TNF plus melphalan. The tumors and ulcers were measured and viable tumor area was calculated. Post-ILP tumors were analyzed by electron microscopy for vascular damage and also by liquid chromatography atmospheric pressure chemical ionization tandem mass spectrometry (LC/APCI/MS/MS) for free melphalan levels. Colorimetric 3-(4,5-dimethylthiazol-2-yl)-2,5-dephenyltetrazolium bromide (MTT) assays were performed on NIH1286 cells and human dermal microvascular endothelial cells (HDMVEC) to test for direct cytotoxicity to TNF and melphalan. Post-ILP tumors sections were also examined by electron microscopy.The mean maximal decrease in viable tumor area after ILP for control, TNF, melphalan, and TNF + melphalan groups were 0%, 22 +/- 13%, 61 +/- 14%, and 100 +/- 0%, respectively. LC/APCI/MS/MS revealed no difference in the free tumor melphalan concentration between melphalan alone and TNF + melphalan groups. The percent cytotoxicity in MTT assays using TNF, melphalan, and TNF + melphalan against NIH1286 were 0%, 51-59%, and 74-81%, respectively, and against HDMVEC were 28%, 16-23%, and 6-13%, respectively. Electron microscopic analyses showed that addition of TNF to the perfusate caused erythrostasis in tumor blood vessels.We developed a human melanoma nude rat ILP model with tumor responses very similar to the human ILP trials. This model will allow further investigation of the synergistic mechanism of TNF and melphalan in human melanoma in a preclinical setting, and extension of this study to current clinical trials." @default.
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• W2044235770 date "2003-04-01" @default.
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• W2044235770 title "A human melanoma xenograft in a nude rat responds to isolated limb perfusion with TNF plus melphalan" @default.
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• W2044235770 doi "https://doi.org/10.1067/msy.2003.113" @default.
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