Final answer:
Malignant tumors can grow beyond their boundaries and metastasize to other parts of the body. Cancer cells that enter the bloodstream can form new tumors in different tissues. Somatic mutations in cancer cells can facilitate metastasis and growth in different locations.
Step-by-step explanation:
Malignant tumors (also called malignant neoplasms) are cancerous and can grow beyond the boundaries of the tumor itself. When tumor cells are shed they may enter the bloodstream and travel to other parts of the body, the phenomenon called metastasis. Cancer cells that metastasize can become the focal point of new tumor formation in many different tissues. Because cancer cells continue to cycle and replicate their DNA, they can undergo yet more somatic mutations. These further changes can facilitate metastasis and cancer cell growth in different locations in the body.