What does the term 'metastasis' specifically refer to?

The term 'metastasis' specifically refers to the spread of cancer cells from their original site to other parts of the body. This process is a key characteristic of cancer, distinguishing malignant tumors from benign ones. When cancer cells metastasize, they can invade surrounding tissues and eventually travel through the bloodstream or lymphatic system to establish new tumors in different organs. This ability to spread is one of the factors that makes cancer difficult to treat and can lead to severe complications, as secondary tumors may disrupt the function of vital organs.

Understanding metastasis is crucial for developing treatment plans and prognosis, as it significantly impacts the stage of cancer and the overall approach to patient care.