Tumorigenesis is a complex process involving cell mutagenesis and the transformation of cells from normal to aberrant proliferative behavior. Tumor cells escape the normal constraints on cell division and then progress through the stages of uncontrolled cell proliferation and tumor formation. All of the cells derived from the parent tumor cells display tumorigenic behavior and contribute to the tumor mass as it grows. Tumor growth and survival is dependent on the process of angiogenesis, which provides the tumor with a vascular network and blood supply that effectively feeds the tumor cells. The resulting tumor may remain within the tissue of origin (referred to as in situ cancer) or spread to other tissues and organs via the process of metastasis (referred to as invasive cancer).
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