What is cancer: categories, early signs, and risk factors

Categories of cancer

Cancer is the second leading cause of death in the US and accounts for about 25% of all deaths. Cancer is a malignant disease caused by unlimited reproduction of abnormal cells, which form tumors, disturb normal physiological functions and destroy normal tissues.

Cancer cells can develop their own blood vessels and take nutrients away [...] http://digg.com/u1K4Kt