Determining the capability of a test compound to affect...

Multicellular living organisms and unmodified parts thereof and – Method of using a transgenic nonhuman animal in an in vivo...

Reexamination Certificate

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C435S004000, C530S350000, C530S387100, C424S130100

Reexamination Certificate

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08044259

ABSTRACT:
A small percentage of cells within an established solid tumor have the properties of stem cells. These solid tumor stem cells give rise both to more tumor stem cells and to the majority of cells in the tumor that have lost the capacity for extensive proliferation and the ability to give rise to new tumors. Thus, solid tumor heterogeneity reflects the presence of tumor cell progeny arising from a solid tumor stem cell. We have developed a xenograft model in which we have been able to establish tumors from primary tumors via injection of tumor cells in the mammary gland of severely immunodeficient mice. These xenograft assay have allowed us to do biological and molecular assays to characterize clonogenic solid tumor stem cells. We have also developed evidence that strongly implicates the Notch pathway, especially Notch 4, as playing a central pathway in carcinogenesis.

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