What is the definition of "metastatic" in a medical context?

In a medical context, "metastatic" specifically refers to the process whereby cancer cells spread from the original tumor site to other parts of the body. This definition aligns with the notion that metastatic cancer is characterized by the ability of cancer cells to detach from the primary tumor, travel through the bloodstream or lymphatic system, and establish new tumors in distant organs or tissues.

Understanding this term is essential in oncology, as metastatic cancer often reflects a more advanced stage of disease, influencing treatment options and prognosis. This contrasts with other terms: the concept of a new cancer type would imply the development of a distinct primary cancer, a benign tumor refers to a non-cancerous growth, and a localized infection pertains to an area affected by pathogens, which are unrelated to cancer metastasis. Recognizing these distinctions highlights the unique and complex behavior of metastatic cancer compared to other medical conditions.