Cancer (Malignant tumors)- These tumors have the ability to invade surrounding tissues and/or spread (metastasize) to areas outside the local tissue. These metastatic tumors are the most dangerous and account for a large percentage of cancer deaths. The next few pages will go into some detail on the changes and capabilities that allow cancer cells to form large tumors and to metastasize to other parts of the body.
Some tumors do not progress to the point where they invade distant tissues. Such tumors are said to be benign. Because they do not spread beyond their initial location, they are not considered to be cancerous. Benign tumors are less often lethal than malignant tumors, but they can still cause serious health problems. Large benign tumors can put pressure on organs and cause other problems. In the case of brain tumors, the limited space within the skull means that a large growth in the brain cavity can be fatal.Immediately cancer(metastasize) starts spreading it becomes a problem it becomes deadly for it spreads to other parts if the body, cells and tissues. This is why cancer is deadly.The above diagram depicts the body part that cancer can spread to, and when it starts spreading it spreads rapidly.
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