Brain Metastasis pp 50-65 | Cite as
Experimental Brain Metastasis
Abstract
Tumor metastasis is a complex, multistep process that appears to be dependent upon a number of host and tumor properties (Fidler 1975a; Weiss 1977a; Fidler and Nicolson 1979; Nicolson 1978a). First, emergent malignant tumor cells must be able to survive and grow in a potentially hostile environment and proliferate to form a primary tumor. Once a primary tumor is established, invasion of surrounding normal tissues may take place by mechanical infiltration (Eaves 1973), enzymatic digestion (Dresden et al. 1972), or both. If a primary tumor is able to penetrate blood vessels, malignant cells can be transported to distant sites. Several factors probably influence tumor-cell detachment (Weiss 1977b) and survival in the circulation. While in the blood, tumor cells (or cell emboli) can interact with a variety of humoral or cellular components (such as lymphocytes, platelets, endothelial cells). The hostile environment of the circulatory system probably causes the death of most blood-borne malignant cells originating from solid tumors; only a small percentage of tumor cells actually survive to form secondary tumors (Fidler 1970, 1976). Survival at a distant site appears to involve successful implantation in the microcirculation, extravasation and establishment of a proper environment for subsequent vascularization and growth.
Keywords
Melanoma Cell Retinoic Acid Brain Metastasis Melanoma Line Variant Cell LinePreview
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