May 19 – 20
Ninety per cent of cancer deaths occur when the neoplasm spreads beyond the primary tumor and invades other organs. This process, known as metastasis, normally signals a sharp deterioration in prognosis. The manner in which cancer cells migrate around the body remains an ill-understood process, but it is clearly a topic in which physical science is deeply involved. Normally cells quit the primary tumor and enter either the lymph system of the blood system (“intravasation”).