Stock Photo: This is a schematic drawing of the stages of metastasis 1) attachment 2) local breakdown 3) locomotion 4) secondary tumor. This illustration explains the process of metastasis. Once metastatic cells are attached to the basement membrane (a physical barrier that seperates tissue components), they break through with the help of an enzyme called type IV collagenase. Cancer cells then move through the blood stream enabling them to spread to other parts of the body. A secondary tumor may form at anot

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