Final answer:
Tumor cells that spread to distant parts of the body and establish new tumors are known as metastases, which occurs through a process called metastasis.
Step-by-step explanation:
Tumor cells that have traveled to remote regions of the body through the bloodstream and formed new cancers are known as metastases. The process is called metastasis, and it generally signifies advanced stages of cancer. Cancers tend to metastasize to particular organs, and common sites for metastases include the brain, lungs, bones, and liver. Cancer that has metastasized is often associated with a poor prognosis and is responsible for most cancer deaths.