Final answer:
The statement that metastasis is defined by the growth of new blood vessels within the tumor is incorrect because this process is known as angiogenesis. Metastasis refers to the spread of cancer cells to distant sites, which is a significant contributor to cancer deaths.
Step-by-step explanation:
Out of the options provided regarding metastasis, the incorrect statement is that metastasis is defined by the growth of new blood vessels within the tumor. This process is actually referred to as angiogenesis, which is different from metastasis. Metastasis involves the spread of cancer cells to distant sites via the bloodstream or lymphatic system, forming new tumors, known as metastases. These metastases commonly occur in the brain, lungs, bones, and liver. A high percentage of cancers have already metastasized by the time of diagnosis, and it is true that around 95% of cancer deaths are due to complications from metastasis.
Overall, metastasis is a hallmark of cancer that significantly worsens the prognosis and is the primary cause of cancer-related mortality. Understanding this process is integral to understanding cancer progression and developing therapeutic strategies.