According to the National Cancer Institute, "cancer is a disease in which some of the body’s cells grow uncontrollably and spread to other parts of the body."
What Happens to Cancerous Cells?
Cancer cells rapidly divide and infultrate healthy cells, and they sometimes form tumors.
What Do Tumors Do?
"Cancerous tumors spread into, or invade, nearby tissues and can travel to distant places in the body to form new tumors.Many cancers form solid tumors, but cancers of the blood, such as leukemias, generally do not."