It is when cancer cells break away from a tumour and enter the bloodstream and settle elsewhere in the body. Its not good at all. It is vital that malignant tumours are discovered quickly befor metastasis can occur.
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Peter Thomas has written: 'Metastatic potential of human colorectal cancer cell lines' -- subject(s): Cancer, Cell Line, Colon (Anatomy), Colorectal Neoplasms, Immunology, Metastasis, Neoplasm Metatasis, Pathophysiology, Physiopathology, Rectum 'Companion guide to Far from the madding crowd for 'O' level students'